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Icom IC-7400 Handleiding

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2001 NEW
HF/VHF
ALL MODE TRANSCEIVER
i7400
INSTRUCTION MANUAL
IC-7400.qxd 02.4.2 11:34 Page 1
i
2001 NEW 2001 NEW
FOREWORD
We understand that you have a choice of many differ-
ent radios in the market place. We want to take a cou-
ple of moments of your time to thank you for making
the IC-7400 your radio of choice, and hope you agree
with Icom’s philosophy of “technology first”.Many hours
of research and development went into the design of
your IC-7400.
FEATURES
• 32-bit Floating point DSP and 24-bit AD/DA converter
• DSP IF Filter creates 102 types of filter
• All mode capability covering 160–2 m
• 100 Watt continuous duty cycle
• All mode digital modulation and demodulation
• RTTY demodulator and decoder
• Twin Pass Band Tuning
• RF speech compression with selectable pass band
• Microphone Equalizer
• SSB/CW synchronous tuning
IMPORTANT
READ THIS INSTRUCTION MANUAL
CAREFULLY before attempting to operate the
transceiver.
SAVE THIS INSTRUCTION MANUAL. This
manual contains important safety and operating in-
structions for the IC-7400.
EXPLICIT DEFINITIONS
PRECAUTIONS
R WARNING HIGH VOLTAGE! NEVER attach an
antenna or internal antenna connector during transmis-
sion. This may result in an electrical shock or burn.
R NEVER apply AC to the [DC13.8V] jack on the trans-
ceiver rear panel. This could cause a fire or ruin the trans-
ceiver.
R NEVER apply more than 16 V DC, such as a 24 V
battery, to the [DC13.8V] jack on the transceiver rear
panel. This could cause a fire or ruin the transceiver.
R NEVER let metal, wire or other objects touch any in-
ternal part or connectors on the rear panel of the trans-
ceiver. This may result in an electric shock.
NEVER expose the transceiver to rain, snow or any liquids.
AVOID using or placing the transceiver in areas with tem-
peratures below –10°C (+14°F) or above +60°C (+140°F).
Be aware that temperatures on a vehicle’s dashboard can
exceed 80°C (+176°F), resulting in permanent damage to
the transceiver if left there for extended periods.
AVOID placing the transceiver in excessively dusty envi-
ronments or in direct sunlight.
AVOID placing the transceiver against walls or putting
anything on top of the transceiver. This will obstruct heat
dissipation.
Place unit in a secure place to avoid inadvertent use by
children.
During mobile operation, DO NOT operate the transceiver
without running the vehicle’s engine. When the trans-
ceiver’s power is ON and your vehicle’s engine is OFF,
the vehicle’s battery will soon become exhausted.
Make sure the transceiver power is OFF before starting
the vehicle. This will avoid possible damage to the trans-
ceiver by ignition voltage spikes.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the magnetic
navigation compass to prevent erroneous indications.
BE CAREFUL! The heatsink will become hot when oper-
ating the transceiver continuously for long periods.
BE CAREFUL! If a linear amplifier is connected, set the
transceiver’s RF output power to less than the linear am-
plifier’s maximum input level, otherwise, the linear ampli-
fier will be damaged.
Use Icom microphones only (supplied or optional). Other
manufacturer’s microphones have different pin assign-
ments, and connection to the IC-7400 may damage the
transceiver.
WORD DEFINITION
RR
WARNING
Personal injury, fire hazard or electric
shock may occur.
CAUTION Equipment damage may occur.
NOTE
If disregarded, inconvenience only. No
risk or personal injury, fire or electric
shock.
IC-7400.qxd 02.4.2 11:34 Page 2
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SUPPLIED ACCESSORIES
The transceiver comes with the following accessories.
Qty.
q DC power cable* ................................................ 1
w Hand microphone (HM-36) ................................ 1
e Spare fuses (FGB 30 A) .................................... 2
r Spare fuse (FGB 5 A) ........................................ 1
t CW keyer plug (AP-330) .................................... 1
*The illustration shows OPC-025D. However, OPC-639 is
supplied with versions, which “CE” symbol on the serial
number.
TABLE OF CONTENTS
qw
ert
FOREWORD ..................................... i
IMPORTANT ..................................... i
EXPLICIT DEFINITIONS .................. i
PRECAUTIONS ................................ i
TABLE OF CONTENTS ................... ii
QUICK REFERENCE GUIDE ..... I–X
■ Installation ....................................... I
■ Operation ....................................... III
■ Your first contact ........................... IV
■ Ready to call CQ? ......................... IX
1 PANEL DESCRIPTION ........ 1–12
■ Front panel ..................................... 1
■ Rear panel ...................................... 7
■ LCD display .................................... 9
■ Multi function switches .................. 11
■ Microphone (HM-36) .................... 12
2 INSTALLATION AND
CONNECTIONS ................ 13 – 17
■ Unpacking .................................... 13
■ Selecting a location ...................... 13
■ Grounding ..................................... 13
■ Antenna connection ...................... 13
■ Required connections ................... 14
■ Advanced connections ................. 15
■ Power supply connections ............ 16
■ Linear amplifier connections (not
usable in European countries)....... 17
■ External antenna tuner
connections .................................. 17
3 BASIC OPERATION .......... 18 – 25
■ When first applying power
(CPU resetting) ............................. 18
■ Initial settings ................................ 18
■ Selecting an operating band ........ 19
■ Selecting VFO/memory mode ...... 20
■ VFO operation .............................. 20
■ Frequency setting ......................... 21
■ Operating mode selection ............ 23
■ Volume setting .............................. 23
■ Squelch and receive (RF)
sensitivity ...................................... 24
■ Basic transmit operation ............... 25
4 RECEIVE AND TRANSMIT 26–45
■ Operating SSB ............................. 26
■ Operating CW ............................... 27
■ Electronic keyer functions ............ 29
■ Operating RTTY (FSK) ................. 35
■ RTTY functions ............................. 36
■ Operating AM ............................... 40
■ Operating FM ............................... 41
■ Repeater operation ....................... 44
5 FUNCTIONS FOR RECEIVE
........................................ 46 –53
■ Simple band scope ....................... 46
■ Preamp/Attenuator ....................... 47
■ RIT function .................................. 47
■ AGC function ................................ 48
■ IF filter selection ........................... 49
■ IF (DSP) filter shape ..................... 50
■ Noise blanker ............................... 50
■ Meter peak hold function .............. 50
■ Twin PBT operation ...................... 51
■ Noise reduction ............................ 52
■ Notch function .............................. 52
■ Dial lock function .......................... 52
■ Voice squelch control function ...... 53
6 FUNCTIONS FOR TRANSMIT
............................................ 54 –60
■ VOX function ................................ 54
■ Break-in function .......................... 55
■ ∂TX function ................................ 56
■ Monitor function ............................ 56
■ Speech compressor ..................... 57
■ Transmit filter width selection ....... 57
■ Split frequency operation .............. 58
■ Quick split function ....................... 59
■ Measuring SWR ........................... 60
7 MEMORY OPERATION ..... 61–67
■ Memory channels ......................... 61
■ Memory channel selection ............ 61
■ Programming a memory ............... 62
■ Memory clearing ........................... 62
■ Selecting the call channel ............. 63
■ Programming the call channel ...... 63
■ Frequency transferring ................. 64
■ Programming scan edges ............ 65
■ Assigning memory names ............ 66
■ Memo pads ................................... 67
8 SCANS .............................. 68 – 73
■ Scan types .................................... 68
■ Preparation ................................... 68
■ Voice squelch control function ...... 69
■ Scan set mode ............................. 69
■ Programmed scan/Fine programmed
scan .............................................. 70
■ Memory scan operation ................ 71
■ Select memory scan ..................... 71
■ ∂F scan operation and Fine ∂F scan
...................................................... 72
■ Tone scan/DTCS code scan
operation ...................................... 73
9 ANTENNA TUNER OPERATION
......................................... 74–76
■ Antenna connection and selection 74
■ Antenna tuner operation ............... 75
■ Optional external tuner operation . 76
10 DATA COMMUNICATION .. 77 –79
■ Connections ................................. 77
■ Packet (AFSK) operation .............. 78
■ Adjusting the TNC output level ..... 79
■ Data transmission speed .............. 79
11 SET MODE ......................... 80–88
■ General set mode ......................... 80
■ Tone control set mode .................. 88
12 OPTION INSTALLATION .. 89 – 90
■ Opening the transceiver’s case .... 89
■ UT-102
VOICE SYNTHESIZER UNIT
... 89
■ CR-338
HIGH STABILITY CRYSTAL UNIT
..................................................... 90
13 MAINTENANCE ................. 91–93
■ Trouble shooting ........................... 91
■ Fuse replacement ......................... 92
■ Tuning dial brake adjustment ....... 92
■ Resetting the CPU ........................ 93
■ Frequency calibration (approximate)
..................................................... 93
14 CONTROL COMMAND ...... 94–98
■ Remote jack (CI-V) information .... 94
15 SPECIFICATIONS ..................... 99
16 OPTIONS................................. 100
17 ABOUT CE ...................... 101–102
Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United King-
dom, Germany, France, Spain, Russia and/or other countries.
2001 NEW
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■ Installation
1. Install a ground system for DC noise suppression
and RFI suppression
2. Install your DC power supply
3. Install lightning protection. This will help protect
more than your gear.
4. Install and connect an antenna system for the ap-
propriate bands of operation
5. Connect other peripheral equipment. This includes
microphones, headsets, TNC, amplifiers and any
other equipment necessary to make your shack
complete.
Although your radio will operate by connecting the DC
power supply and antenna, it is necessary to have a
good ground system in your shack. A ground connec-
tion is the electrical contact between the common point
of an electrical or electronic system and the earth.
A good earth ground is necessary to prevent electrical
shock, eliminate problems from RFI and DC noise.
With more electronic devices being used today, it is
also important to reduce RFI and EMI. Although you
may not see interference in your shack, without a
grounding system, your neighbors may experience in-
terference. Even though many of these devices,
where they must accept interference from their sur-
rounding environment, it is best to eliminate as much
of the possible interference from your shack.
If you do not have a grounding system for your shack,
depending on the location of your shack, basement or
ground floor, a good ground system can be as simple
as a couple of ground rods driven 2 to 2.5 meter into
the soil. When installing your IC-7400 to your ground-
ing system, the shortest most direct connection is rec-
ommended.
NOTE: There are many publications covering
proper grounding techniques. Check with your local
dealer for more information and recommendations.
R WARNING!: NEVER ground station equip-
ment or antennas to house gas lines. NEVER at-
tach ground lines to plastic (pvc) pipe.
DD
Some Symptoms if inadequate grounding
a. Poor DC Ground
50/60 Hz hum on the audio either Rx or Tx without
the antenna connected.
If you feel a tingling sensation when you touch a
metal surface. Surfaces such as the cover of your
radio or power supply.
b. Poor RF Ground
While transmitting and you feel a tingling sensation
when you touch a metal surface. Surfaces such as
the cover of your radio or power supply.
While transmitting, you experience interference to
other electronic devices, such as the telephone,
television or stereo audio systems.
The DC power supply is a device used to convert
110/220 V AC, also know as Household current, to a
steady source of 13.8 V DC.
The perfect match to your IC-7400 is the PS-125. This
compact switching power supply is the matching
power supply for your IC-7400 with a current rating of
25 A continuous duty. This plug and play unit plugs
into the DC jack located on the rear of the radio.
• If you are not using the PS-125:
Connect the supplied DC power cable to the appro-
priate color coded terminals, then insert the DC con-
nector into the DC jack located on the rear of the
radio. (The diagram below describes the connection with
OPC-639. OPC-025D has no filter box and GND cable.)
NOTE: Although the power supply current require-
ment is quite low during receiving, this not the case
when you transmit. With many electrical devices in
the shack, it is very important to verify the electrical
circuit is not overloaded.
30 A fuses
AC cable
Transceiver
AC
outlet
A DC power
supply*
*13.8 V; at least 23 A
continuous
Black
_
Red
+
to DC power
socket
Supplied
DC power cable
PS-125
DC power
socket
Transceiver
DC power cable
Connect to an AC outlet using the supplied AC cable.
1. Grounding your Shack
2. Installing your DC Power Supply
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3. Installing lightning protection
Although you may not live in an area with high occur-
rence for lightning storms, it is always wise to take
precautions for lightning or static discharges. Proper
lightning protection not only offers protection to the
ham gear, but the shack and most importantly the op-
erator.
NOTE: There are many publications covering
proper lightning protection, check with your local
dealer for more information and recommendations.
Whether your IC-7400 is your first radio or one of
many, one of your key elements in a great shack is
the antenna system. There are three connections on
the back of your IC-7400, two for HF and 6 m and one
for 2 m. If you are using one antenna for HF and 6 m,
for simplicity, connect the antenna coax to ANT1.
Your IC-7400 is equipped with an internal antenna
tuner (ATU) for operation on 160–6 m. This ATU is de-
signed to work with an unbalanced 50 Ω feedline. The
purpose of the internal antenna tuner is to match the
impedance of your antenna system to as close to a
50 Ω load as possible. This ATU will not operate with
a long wire or ladder line (450 Ω or other balanced
feedlines). An external ATU such as the AH-4 would
be necessary for this kind of operation.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm ≈
9
⁄8 in 10 mm ≈
3
⁄8 in 1–2 mm ≈
1
⁄16 in
R WARNING: Although a mag mount antenna
works great on a vehicle, DO NOT use the IC-7400
with this type of antenna.
CAUTION: Although your IC-7400 has protection
to drop down power with a high SWR, this does not
completely protect the transceiver from transmis-
sion without an antenna. Make sure you have an
antenna connected whenever you transmit with
your radio.
NOTE: There are many publications covering
proper antennas and their installation, check with
your local dealer for more information and recom-
mendations.
30 mm
10 mm (soft solder)
10 mm
1–2 mm
solder solder
Soft
solder
Coupling ring
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Slide the connector
body on and solder it.
Screw the coupling
ring onto the
connector body.
Strip the cable as
shown at left. Soft sol-
der the center con-
ductor.
q
w
e
r
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final tran-
sistors. In this case, an antenna tuner is useful to
match the transceiver and antenna. Low SWR al-
lows full power for transmitting even when using the
antenna tuner. The IC-7400 has an SWR meter to
monitor the antenna SWR continuously.
ANTENNA 1, 2
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands
144 MHz ANTENNA
Connect a VHF (60–144 MHz)
antenna; impedance: 50 Ω.
4. Installing your antenna system
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2001 NEW 2001 NEW
5. Connect other peripheral equipment
Everyone has his or her favorite ad-on gear; now is
the time to connect this gear! We will cover the basic
devices that can be connected to your IC-7400.
If you do not see the particular item you are wanting
to connect, refer to the Advance Connections section
starting on page 15.
Microphones: Connect the microphone to the eight-
pin connector on the front of the radio.
MICROPHONES
HM-36 SM-20
■ Operation
1. Voice
CW Key: There are several types of keys or keyers
that can be used with your IC-7400.
a. Iambic Key paddle: Use a 6.35(d) mm (
1
⁄4″) stereo
plug and connect to the [ELEC-KEY] jack located
on the front of the radio.
b. Straight Key: Use a 6.35(d) mm (
1
⁄4″) mono plug
and connect key to the back of the radio.
c. External Keyer: Use a 6.35(d) mm (
1
⁄4″) mono
plug and connect to the back of the radio.
d. Computer Keying: Use a 6.35(d) mm (
1
⁄4″) mono
plug and connect to the back of the radio.
NOTE: You will need to select the type of keyer you
are using in the Keyer Set mode. There are many
advanced CW functions in this set mode, until you
have a full understanding of these functions
change only the items necessary.
STRAIGHT KEY
(+)
(_)
CW KEY
A straight key can be used when the internal
electronic keyer is turned OFF in keyer set
mode. (p. 34)
(dot)
(com)
(dash)
2. CW
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3. Other convenient items
Headphones:
A 6.35(d) mm (
1
⁄4″) mono jack for operation without
using the internal or external speakers. Perfect for op-
eration without disturbing others in the room.
External Speaker:
A 3.5(d) mm (
1
⁄8″) mono jack for operation with an ex-
ternal speaker. (Input impedance: 8 Ω/Max. input
power: 5 W)
EXTERNAL SPEAKER
SP-21 (optional)
HEADPHONES
1. Before powering up your radio, you may want to
make sure the following controls are set in the fol-
lowing positions:
•[AF] : Commonly referred to as the vol-
ume: fully counter clockwise.
•[NR] : The noise reduction control: fully
counter clockwise.
•[MIC GAIN] : The mic gain: fully counter clock-
wise.
•[RF/SQL] : The control for the RF Gain and
Squelch circuits: 12 o’clock.
•[CW PITCH] : The control for the CW pitch:
12 o’clock.
•[KEY SPEED] : Internal CW Keyer Speed: fully
counter clockwise.
•[NOTCH] : Control for the manual notch:
12 o’clock
2. Resetting the CPU: Although you have purchased
a brand new radio, some settings may be changed
from the factory defaults during the QC process. So
your radio can start from Factory Defaults resetting
the CPU is necessary.
[POWER] [F-INP] [M-CL]
■ Your first contact
Now you should have your IC-7400 installed in your
shack, and like a kid on his birthday, you are probably
excited to get on the air. We would like to take you
through a few basic operation steps to make your first
“On The Air” an enjoyable experience.
DD
Getting started
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DD
Just listening
3. Verify proper antenna has been selected.
1. Select the desired band
On your IC-7400, an easy way of changing bands is
by using the keypad located just above the tuning
knob on the right hand side of the display. You will no-
tice each switch has two sets of numbers; one set of
numbers represents the band selection.
•Say you want to go to 20 meters or 14 MHz; you
would push the [14
5
]. This will immediately change
the displayed operating frequency to the 20-meter
band. By pushing [14
5
] again, frequency pre-sets
in the triple band stacking registers frequency can be
displayed. For more details on this system refer to
p. 19.
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
Directly below the keypad is the tuning knob. This will
allow you to dial in the frequency you want to oper-
ate. You will notice the tuning speed [TS] is 10 Hz res-
olution. Page 22 will instruct you on how to set the
tuning speed [TS] for 1 Hz resolution.
NOTE: Although you can directly enter the fre-
quency with the keypad, using the Band Stacking
Register and the tuning knob is the most popular
method of hoping around the bands. For more in-
formation regarding the direct frequency entry
method, refer to p. 22.
Your IC-7400 has three antenna connectors. Two for
HF and 6 m and a one for 2 m. The selection for 2 m
is automatic, where the HF and 6 m is user selectable
for either one of the antenna jacks. For first time use,
the antenna selector should show “” on the dis-
play of your radio. Verify the antenna selected on the
display is the antenna port your antenna is connected
to.
Either “1” or “2” appears.
*No indicator appears during
144 MHz operation.
Adjust this control to a comfortable audio level.
AF RF/SQL
No audio output
Max. audio output
Decreases Increases
2. Tune to the desired frequency
4. Adjust audio output
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DD
What are you hearing?
Stop and focus on what you are hearing. Do you hear
a lot of noise? Is the signal intelligible? Are you set up
for the right mode? How about the filters?
1. Verify mode
Your IC-7400 has many features to reduce QRM and
QRN from the desired signal.
a. Noise Reduction: The noise reduction system on
your IC-7400 is part of the 32-bit DSP. This is used
to reduce the hiss and QRM levels. To activate,
push the [NR] switch located just to the right of the
[PHONES] jack.
b. Adjusting the Noise Reduction: The noise re-
duction is completely variable on how much of the
DSP Noise Reduction is used [NR] level control lo-
cated just above the [NR] switch.
Hint!
How far you advance the NR control will determine
how much the noise can be effectively reduced.
Turning the control too far clockwise may cause
some distortion to occur on the received signal. The
NR control should only be turned as far clockwise
as is necessary. Use this control, along with RF
gain, NB (noise blanker, if needed), and IF filters as
well, to minimize the effects of noise on the target
signal.
Noise reduction ON
Noise reduction OFF
NR NOTCH
OFF
Decreases
Increases
AGC
DUP
CMP
TBW
SCP
[NR] [NR]
Appears
Although your IC-7400 will automatically select USB
or LSB in the HF bands, it will not select any of the
other modes. You will need to select the proper mode
whether CW, RTTY, AM or FM.
Hint!
The Triple Band Stacking Register will memorize
the last three frequencies used in the band, as well
as the Mode, Filter, Tuner and AGC settings. This
makes band hoping much easier.
SSB
CW/RTTY
AM/FM
2. Reducing interference
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c. Notch: There are two notch systems on your IC-
746PRO.
•Automatic: The automatic notch will track up to three
heterodynes. This is helpful for eliminating annoying
transmitter “tune up” tones on any band, and to min-
imize continuous tone “heterodynes” encountered on
the 40 meter phone bands at night, for example.
Once selected an icon will appear “A NOTCH” on
the display.
•Manual: The Manual notch provides 70 dB of atten-
uation to pin point an interfering signal. The 12 o’-
clock position is on the operating frequency, turning
the Notch knob clockwise moves the notch up the
band and counter clockwise will move the notch
down the band. Once selected an icon “NOTCH” will
appear on the display.
NOTE: Your IC-7400 is equipped with multiple
AGC circuits. This allows the DSP to filter out inter-
fering signals and QRM, while also taking this in-
terference out of the AGC. Bottom line, this will ei-
ther eliminate or greatly reduce the pumping of the
AGC from the interfering signal.
AGC
DUP
CMP
TBW
SCP
[A/NOTCH] [NOTCH]
Notch function indicators
NR NOTCH
Low frequency High frequency
Hint!
The Automatic Notch will not operate in the SSB
data, CW or RTTY modes.
d. Filters: Your IC-7400 has an incredible IF DSP
based filter network with over 100 settings.
•Dial in your filters: By pushing [FILTER] for 1 sec.,
you enter the filter set mode. This is where you are
able set the three filter presets. Across the bottom of
the display you will see the “BW” icon. The switch di-
rectly below, along with the tuning dial, will be used
to select the changes you will make.
BW
• Filter set mode indication
Shows the selected filter and passband width.
BW
• Indication while setting
While pushing [F1 BW], rotate the tuning dial to set
passband width.
Reverses Appears
AGC
DUP
CMP
TBW
SCP
[FILTER]
The selected filter width is indicated
for approx. 1 sec. when [FILTER] is
pushed.
Filter selection
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d. Filters:— continued
•
On the fly adjustment: Once the adjustments have
been made in the filter set mode, you can make on
the fly changes by using the Twin Pass Band Tuning,
Twin PBT. You will be able to see the effects of the
Twin PBT on the upper left hand side of the screen.
NOTE: The Twin PBT filters shift the two IF DSP
filters (See Diagrams below and right). This feature
allows both an IF shift as well as a narrowing of the
Pass Band. Although you can narrow the pass
band by shifting the two filters, this does not nar-
row both filters, thus the filter shape is not nar-
rowed. You may hear some signal artifacts pass
through this filter adjustment.
PBT operation example
BW
• Filter set mode indication
Shows the selected filter and passband width.
BW
• Indication while PBT setting
Appears when passband is shifted.
*By pushing [PBTC] for 1 sec., the shifted value returns
to the default setting, and the “dot” disappears.
AGC
DUP
CMP
TBW
SCP
Passband width and shifting value are
indicated while [TWIN PBT] is operated.
[TWIN PBT] control
[PBTC]
Appears when PBT is used.
One of “1,” “2” or “3” is
displayed for selected filter
number indications.
interference
inteference
interference
desired signal
desired signal
pass band
IF center frequency
Center
Passband
Passband
IF center freq.
IF shift
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Once you have mastered your filter settings, one last
feature to enable the most intelligible audio is the ac-
tual audio tone you hear. You can adjust the equal-
ization of your received audio ±5dB.
q Push [MENU] several times, or until M2 is shown
on the display.
w Push [F4 TCN] for the Tone Control set mode.
e Push the appropriate mode switch to adjust SSB,
AM or FM.
r Push [F1 ≤] or [F2 ≥] to change to the desired
component.
[F1 ≤]
Tuning dial[MENU]
[F2 ≥] [F4 TCN]
3. RX Tone Control:
1. RX Bass
This item adjusts the bass level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
RX
Bass
SSB
O
3
2. RX Treble
This item adjusts the treble level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
RX
Treble
SSB
O
4
We hope these pointers have been helpful. Now you
are ready for the “Ready to call CQ?”.
■ Ready to call CQ?
The 32-bit DSP in your IC-7400 is capable of allowing
you to selects transmit audio for phone modes.
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
NR
A
/NOTCH
TUNER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TWIN PBT
M-CH
RIT
CLEAR
∂TX
RIT/∂TX
TS
SPLIT
PBTC
F-INP
A/B
V/M
MW
M-CL
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i7400
MENU
SSB
CW/RTTY
AM/FM
FILTER
[NR]: Max. CCW [NOTCH]: Max. CCW
[AF]: Max. CCW
[TRANSMIT]: OFF
[MIC GAIN]: Max. CCW
[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock
[RF/SQL]: 12 o’clock
[KEY SPEED]: Max. CCW
1. Setting up your transmit audio
2. Mic Gain
The microphone gain is used for proper transmit
audio level for full output power.
IC-7400.qxd 02.4.2 11:35 Page IX
X
QUICK REFERENCE GUIDE
2001 NEW
Verify you have selected a clear frequency
and call out your CQ!
The capability of changing the pass band of your
transmit audio, is at your finger tips. Regardless of the
condition of the speech compressor, you can adjust it
by selecting the [F4 TBW].
You will find this located in the M1 menu. By pushing
[F4 TBW] for 1 sec. you can select the TX audio band
pass.
There are three levels of audio passband width avail-
able (Wide, Mid, and Nar).
TX Audio Passband widths
Wide : 2.8 kHz ; Great Full Audio
Mid :2.4 kHz ; Great for operators with
deep full voices
Nar : 2.2 kHz ; Great for breaking through
pile ups
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TBW
SCP
AGC
DUP
CMP
TBW
SCP
TX
BW=WIDE
Push [F4]
Push [F4] for 1 sec. to select the transmit filter width.
The selected transmit filter width
is displayed for approx. 1 sec.
3. DSP TX Audio Pass Band
4. Microphone Equalizer
Although these bandwidths are fixed, the Microphone
Tone Control will give you more audio control for your
voice operation on SSB, AM, and FM modes. Your IC-
7400 is equipped with a very powerful equalizer sys-
tem with 121 possible combinations. This is achieved
by using the separate bass and treble adjustments.
The default for both the Base and Treble is at 0 dB.
Entering Microphone Tone Control set mode:
q Push [MENU] several times, or until M2 is shown
on the display.
w Push [F4 TCN] for the Tone Control set mode.
e Push the appropriate mode switch to adjust SSB,
AM, or FM.
r Push [F1 ≤] or [F2 ≥] to change to the desired
component.
Hint!
Voice patterns and audio characteristics vary with
each operator, therefore the [MIC GAIN], DSP TX
Audio Pass Band and Microphone Tone Control
settings will be different for each operator. Actual on
air experimenting is necessary to get just the right
sound. Listen to your transmit audio with head-
phones and the monitor function turned ON. It’s
also best to test and adjust your audio on the air,
while someone who knows what your real voice
sounds like listens, and provides and opinion on
your audio quality.
[F1 ≤]
Tuning dial[MENU]
[F2 ≥] [F4 TCN]
1. TX Bass
This item adjusts the bass level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
TX
Bass
SSB
O
1
2. TX Treble
This item adjusts the treble level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
TX
Treble
SSB
O
2
IC-7400.qxd 02.4.2 11:35 Page X
1
1
PANEL DESCRIPTION
2001 NEW
■ Front panel
q POWER SWITCH [POWER]
➥ Push momentarily to turn power ON.
• Turn the optional DC power supply ON in advance.
➥ Push for 1 sec. to turn power OFF.
w TRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
•The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
e HEADPHONE JACK [PHONES]
Accepts headphones.
• Output power: 5 mW with an 8 Ω load.
•When headphones are connected, the internal speaker
or connected external speaker does not function.
r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14)
Accepts a paddle to activate the internal electronic
keyer for CW operation.
•Selection between the internal electronic keyer, bug-key
and straight key operation can be made in keyer set
mode. (p. 34)
•A straight key jack is separately available on the rear
panel. See [KEY] on p. 7.
•Keyer polarity (dot and dash) can be reversed in keyer
set mode. (p. 34)
•4-channel memory keyer is available for your conve-
nience. (p. 30)
t MICROPHONE CONNECTOR [MIC]
Accepts the supplied or an optional microphone.
• See p. 101 for appropriate microphones.
• See p. 12 for microphone connector information.
y RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
•The squelch is particularly effective for FM. It is also
available for other modes.
•12 to 1 o’clock position is recommended for any setting
of the [RF/SQL] control.
•The control can be set as ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM) or
squelch control (RF gain is fixed at maximum) in set
mode as follows. (p. 81)
• When setting as RF gain/squelch control
Recommended level
RF gain
adjustable
range
Maximum
RF gain
S-meter
squelch
Noise squelch (FM mode)
Squelch is
open.
MODE
SSB, CW
RTTY
AM, FM
AUTO
RF GAIN
SQL
SQL
SET MODE SETTING
SQL
SQL
RF GAIN + SQL
RF GAIN + SQL
RF GAIN + SQL
(dot)
(com)
(dash)
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
NR
A
/NOTCH
TUNER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TS
SPLIT
F-INP
A/B
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i7400
MENU
SSB
CW/RTTY
AM/FM
FILTER
q
w
e
r
t
yuio !0 !1
!4!5!6!7 !3 !2
IC-7400.qxd 02.4.2 11:35 Page 1
2
1
PANEL DESCRIPTION
•When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
•When functioning as squelch control
(RF gain is fixed at maximum.)
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
u MIC GAIN CONTROL [MIC GAIN]
Adjusts microphone input gain.
•The transmit audio tone in SSB, AM and FM modes can
be adjusted in tone control set mode. (p. 88)
✔
How to set the microphone gain.
Set the [MIC] control so that the ALC meter sometimes
swings during normal voice transmission in SSB mode.
Make sure that voice peak readings do not exceed the ALC
range brackets on the meter.
i AF CONTROL [AF] (inner control)
Varies the audio output level from the speaker.
o RF POWER CONTROL [RF PWR]
Continuously varies the RF output power from min-
imum (less than 5 W*) to maximum (100 W*).
* AM mode: less than 5 W to 40 W
!0 CW PITCH CONTROL [CW PITCH] (p. 28)
Shifts the received CW audio pitch and monitored
CW audio pitch without changing the operating fre-
quency.
•The pitch can be changed from 300 to 900 Hz in approx.
25 Hz steps.
!1 ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p. 28)
Adjusts the internal electronic CW keyer’s speed.
• 6 wpm (min.) to 60 wpm (max.) can be set.
!2 AUTO NOTCH/MANUAL NOTCH SWITCH
[A/NOTCH] (p. 52)
Toggles the notch function between manual and au-
tomatic when pushed.
•“NOTCH” appears when manual; “A NOTCH” appears
when automatic notch is selected.
!3 NOTCH CONTROL [NOTCH] (outer control; p. 52)
Adjusts the notch filter frequency to remove an in-
terfering signal.
!4 ANTENNA SELECTOR SWITCH [ANT] (p. 74)
Switches the antenna connector selection between
ANT1 and ANT2 when pushed.
!5 NOISE REDUCTION LEVEL CONTROL [NR]
(inner control; p. 52)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
!6
ANTENNA TUNER SWITCH [TUNER] (pgs. 75, 76)
➥ Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
➥ Starts to tune the antenna manually when
pushed for 1 sec.
•When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
!7 NOISE REDUCTION SWITCH [NR] (p. 52)
Switches the noise reduction ON and OFF.
•“NR” appears while the noise reduction is activated.
NR NOTCH
OFF
Decreases
Increases
NR NOTCH
Low frequency High frequency
Slow Fast
KEY SPEED
CW PITCH
IncreasesDecreases
RF PWR
IncreasesDecreases
AF RF/SQL
No audio output
Max. audio output
Decreases Increases
MIC GAIN
Recommended level for
an Icom microphone
IncreasesDecreases
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM mode)
Shallow Deep
Noise squelch (FM mode)
Minimum RF gain
Adjustable
range
Maximum
RF gain
IC-7400.qxd 02.4.2 11:35 Page 2
3
1
PANEL DESCRIPTION
2001 NEW 2001 NEW
■ Front panel (continued)
!8 MULTI-FUNCTION SWITCHES [F1]–[F5]
➥Push to select the function indicated in the LCD
display above these switches. (p. 11)
•Functions vary depending on the operating mode.
➥Push to input a character for memory keyer pro-
gramming or memory name. (pgs. 31, 66)
!9 MENU SWITCH [MENU]
Push to change the set of functions assigned to the
multi-function switches.
• Toggles between menu 1 (M1) and menu 2 (M2).
@0 MODE SWITCHES
Selects the desired mode. (p. 23)
•Announces the selected mode when an optional UT-102
is installed. (p. 89)
➥ Selects USB and LSB mode alternately.
➥ Selects SSB data mode (USB-D, LSB-D)
when pushed for 1 sec. in SSB mode.
➥ Selects CW and RTTY mode alternately.
➥ Switches CW and CW-R (CW reverse)
mode when pushed for 1 sec. in CW
mode.
➥ Switches RTTY and RTTY-R (RTTY re-
verse)
mode when pushed for 1 sec. in
RTTY mode.
➥ Selects AM and FM mode alternately.
➥ Selects AM/FM data mode (AM-D, FM-D)
when pushed for 1 sec. in AM/FM mode.
@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT]
(p. 47)
➥ Push momentarily to toggle between preamp-1
and preamp-2.
•“P.AMP1” activates for HF all bands.
•“P.AMP2” activates high-gain preamp for 24 MHz
band and above.
➥ Push for 1 sec. to toggle the attenuator function
ON and OFF.
✔
What is the preamp?
The preamp amplifies received signals in the front end cir-
cuit to improve the S/N ratio and sensitivity. Select “P.AMP1”
or “P.AMP2” when receiving weak signals.
✔
What is the attenuator?
The attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequency, or
when very strong electric fields, such as from a broadcast-
ing station, are near your location.
@2 NOISE BLANKER SWITCH [NB] (p. 50)
➥ Switches the noise blanker ON and OFF when
pushed. The noise blanker reduces pulse-type
noise such as that generated by automobile igni-
tion systems. This function cannot be used for
FM, or non-pulse-type noise.
•“NB” appears while the noise blanker is activated.
➥ Enters the noise blanker level set mode when
pushed for 1 sec.
AM/FM
CW/RTTY
SSB
T
Y
NR
A
/NOTCH
TUNER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TWIN PBT
M-CH
RIT
CLEAR
∂TX
RIT/∂TX
TS
SPLIT
PBTC
F-INP
A/B
V/M
MW
M-CL
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i746PRO
MENU
SSB
CW/RTTY
AM/FM
FILTER
#7
#6
#5
#4
#3
#2
#1
#0
!9 @0 @1!8 @2 @3 @4
@6@5 @7 @8 @9
IC-7400.qxd 02.4.2 11:35 Page 3
4
1
PANEL DESCRIPTION
2001 NEW
@3 VOX/BREAK-IN SWITCH [VOX/BK-IN]
➥ In SSB, AM and FM modes, push momentarily to
turn the VOX function ON and OFF (p. 54); push
for 1 sec. to enter VOX set mode (p. 54).
➥ In CW mode, push momentarily to turn the semi
break-in, full break-in or break-in OFF (p. 55);
push for 1 sec. to enter break-in set mode (p. 55).
✔
What is the VOX function?
The VOX function (voice operated transmission) starts trans-
mission without pushing the transmit switch or PTT switch
when you speak into the microphone; then, automatically re-
turns to receive when you stop speaking.
✔
What is the break-in function?
Full break-in (QSK) activates the receiver between transmit-
ted dots and dashes. This is useful when operating in nets,
or during DX pileups and during contests, when “fast ex-
changes” are common.
@4 MONITOR SWITCH [MONITOR] (p. 56)
➥ Monitors your transmitted signal.
➥ Enters monitor set mode when pushed for 1 sec.
@5 FILTER SWITCH [FILTER] (p. 49)
➥ Selects one of 3 IF filter settings.
➥ Enters the filter set mode when pushed for 1 sec.
@6 CALL SWITCH [CALL] (p. 63)
Selects the call channel when pushed momentarily.
@7 TUNING DIAL (p. 21)
Changes the displayed frequency, selects set mode
items, etc.
@8
LOCK/SPEECH SWITCH [LOCK/SPCH]
➥ Push momentarily to toggle the dial lock function
ON and OFF. (p. 52)
➥ Pushing for 1 sec. announces the selected read-
out frequency and S-meter indication when an
optional UT-102 is installed. (p. 89)
@9 RIT/
∂∂
TX CONTROL [RIT/
∂∂
TX] (pgs. 47, 56)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency
while the RIT and/or ∂TX functions are ON.
•Rotate the control clockwise to increase the frequency,
or rotate the control counterclockwise to decrease the
frequency.
• The shift frequency range is ±9.99 kHz in 10 Hz steps.
#0 RIT SWITCH [RIT] (p. 47)
➥
Turns the RIT function ON and OFF when pushed.
• Use the [RIT/∂TX] control to vary the RIT frequency.
➥ Adds the RIT shift frequency to the operating fre-
quency when pushed for 1 sec.
✔
What is the RIT function?
The RIT (Receiver Incremental Tuning) shifts the receive fre-
quency without shifting the transmit frequency.
This is useful for fine tuning stations calling you on an off-fre-
quency or when you prefer to listen to slightly different-
sounding voice characteristics, etc.
#1 CLEAR SWITCH [CLEAR] (pgs. 47, 56)
Clears the RIT/∂TX shift frequency when pushed
for 1 sec.
•Can be cleared instantly when [CLEAR] is pushed if the
Quick RIT Clear is set to ON (p. 85).
#2
∂∂
TX SWITCH [
∂∂
TX] (p. 56)
➥ Turns the ∂TX function ON and OFF when
pushed.
•Use the [RIT/∂TX] control to vary the ∂TX frequency.
➥ Adds the ∂TX shift frequency to the operating
frequency when pushed for 1 sec.
✔
What is the
∂∂
TX function?
The ∂TX shifts the transmit frequency without shifting the re-
ceive frequency. This is useful for simple split frequency op-
eration in CW, etc.
#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 61)
Select a memory channel.
•Rotate clockwise to increase the memory channel; ro-
tate counterclockwise to decrease the memory channel.
#4 VFO/MEMORY SWITCH [VFO/MEMO]
➥ Switches the selected readout operating mode
between the VFO mode and memory mode when
pushed. (pgs. 20, 61)
➥ Transfers the memory contents to VFO when
pushed for 1 sec. (p. 64)
#5 MEMORY CLEAR SWITCH [M-CL] (p. 62)
Clears the selected readout memory channel con-
tents when pushed for 1 sec. in memory mode.
• The channel becomes a blank channel.
• This switch does not function in VFO mode.
#6 MEMORY WRITE SWITCH [MW] (p. 62)
Stores the selected readout frequency and operat-
ing mode into the displayed memory channel when
pushed for 1 sec.
•This function is available both in VFO and memory
modes.
#7 PBT CLEAR SWITCH [PBTC] (p. 51)
Clears the PBT settings when pushed for 1 sec.
Low shift High shift
RIT/∂TX
IC-7400.qxd 02.4.2 11:35 Page 4
■ Front panel (continued)
#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC]
(pgs. 45, 47)
Monitors the transmit frequency when pushed and
held.
•While pushing this switch, the transmit frequency can be
changed with the tuning dial, keypad or memo pad.
•When the split lock function is turned ON, pushing [XFC]
cancels the dial lock function. (p. 59)
#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 67)
Programs the selected readout frequency and op-
erating mode into a memo pad.
•The 5 most recent entries remain in memo pads.
•The transmit frequency is programmed when pushed to-
gether with [XFC].
•The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p. 84)
$0 TRANSMIT INDICATOR [TX]
Lights red while transmitting.
$1 MEMO PAD-READ SWITCH [MP-R] (p. 67)
Each push calls up a frequency and operating
mode in a memo pad. The 5 (or 10) most recently
programmed frequencies and operating modes can
be recalled, starting from the most recent.
•The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p. 84)
$2 RECEIVE INDICATOR [RX]
Lights green while receiving a signal and when the
squelch is open.
$3 LOCK INDICATOR [LOCK] (p. 52)
Lights when the dial lock function is activated.
$4 QUICK TUNING SWITCH [TS] (p. 21)
➥ Turns the quick tuning step ON and OFF.
•While the quick tuning indicator is displayed, the fre-
quency can be changed in programmed kHz steps.
•0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning
steps are available.
➥ While the quick tuning step is OFF, turns the 1 Hz
step ON and OFF when pushed for 1 sec.
•1 Hz indication appears, and the frequency can be
changed in 1 Hz steps.
➥ While the quick tuning step is ON, enters the
quick tuning step set mode when pushed for
1 sec.
$5 VFO SELECT SWITCH [A/B] (p. 20)
➥ Push to toggle between VFO A and VFO B.
➥ Push for 1 sec. to equalize the frequency and op-
erating mode of the two VFO’s.
Quick tuning indicator
5
1
PANEL DESCRIPTION
2001 NEW 2001 NEW
NR
A
/NOTCH
NER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TWIN PBT
M-CH
RIT
CLEAR
∂TX
RIT/∂TX
TS
SPLIT
PBTC
F-INP
A/B
V/M
MW
M-CL
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i746PRO
MENU
SSB
CW/RTTY
AM/FM
FILTER
$7
$4
$5
$6
$3
$2
$1
$0
#9
#8
%2
%0 $9 $8%1
IC-7400.qxd 02.4.2 11:35 Page 5
6
1
PANEL DESCRIPTION
2001 NEW
$6 SPLIT SWITCH [SPLIT]
➥ Turns the split function ON and OFF when
pushed.(p. 58)
➥ Turns the quick split function ON, when pushed
for 1 sec. (p. 59)
•The offset frequency is shifted from the displayed fre-
quency.
•The quick split function can be turned OFF using set
mode. (p. 82)
➥ Turns the split function ON and sets the transmit
frequency after inputting an offset frequency with
the keypad (±4 MHz in 1 kHz steps; p. 58).
$7 PASSBAND TUNING CONTROLS [TWIN PBT]
Adjust the receiver’s “passband width” of the DSP
filter. (p. 51)
•Passband width and shift frequency are displayed in the
multi-function switch indicator.
•Push [PBTC] for 1 sec. to clear the settings when not in
use.
•Variable range is set to half of the IF filter passband
width. 25 Hz steps and 50 Hz steps are available.
•These controls function as an IF shift control while in AM
mode and when the RTTY filter is turned ON. Only the
inner control may function in this case.
✔
What is the PBT control?
General PBT function electronically narrows the IF passband
width to reject interference. This transceiver uses the DSP
circuit for the PBT function.
$8 SPLIT INDICATOR (p. 58)
Lights during split operation.
$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22)
Push to toggle keypad input between frequency and
band.
• The frequency input indicator lights when fre-
quency input is selected for the keypad.
%0 FREQUENCY INPUT INDICATOR (p. 22)
Lights when frequency input from the keypad is en-
abled.
%1 KEYPAD
➥ Pushing a key selects the operating band.
•[GENE • ] selects the general coverage band.
➥ Pushing the same key 2 or 3 times calls up other
stacked frequencies and modes in the band.
(p. 19)
•Icom’s triple band stacking register memorizes 3 fre-
quencies in each band.
➥ After pushing [F-INP], enter a keyed frequency.
Pushing [144 ENT] is necessary at the end.
(p. 22)
•e.g. to enter 14.195 MHz, push [F-INP] [1.8
1
] [10
4
]
[GENE • ] [1.8
1
] [28
9
] [14
5
] [144 ENT].
%2 LCD FUNCTION DISPLAY
(See pgs. 9, 10 for details.)
Shows the operating frequency, function switch
menus, band scope screen, memory name screen,
set mode settings, etc.
PBT1
PBT2
TWIN PBT
Low cut High cutCenter
TWIN PBT TWIN PBT TWIN PBT
– +
IC-7400.qxd 02.4.2 11:35 Page 6
■ Rear panel
!5 !3 t
r
!2 !1 !0 oi uy
qwe
!4
7
1
PANEL DESCRIPTION
2001 NEW 2001 NEW
q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16)
Accepts 13.8 V DC through the supplied DC power
cable (OPC-025D).
w ANTENNA CONNECTOR [ANT 144MHz]
e ANTENNA CONNECTOR 2 [ANT2]
r ANTENNA CONNECTOR 1 [ANT1]
(pgs. 14, 15, 17, 75)
Accepts a 50 Ω antenna with a PL-259 connector.
•[ANT 144MHz] for 144 MHz (2 m) band only; [ANT1] and
[ANT2] for both HF and 50 MHz (6 m) bands antennas.
When using an optional AH-4 HF/50 MHz AUTO-
MATIC ANTENNA TUNER
, connect it to the [ANT1]
connector. The internal antenna tuner activates
for [ANT2] and deactivates for [ANT1] when con-
necting the AH-4.
t DATA SOCKET [DATA] (pgs. 15, 78)
Connects a TNC (Terminal Node Controller), etc. for
data communications.
• See p. 8 for connector information.
y
EXTERNAL SPEAKER JACK [EXT SP] (pgs. 15, 101)
Accepts a 4–8 Ω speaker.
u
CI-V REMOTE CONTROL JACK [REMOTE] (p. 95)
➥ Designed for use with a personal computer for re-
mote control of the transceiver functions.
➥ Used for transceive operation with another Icom
CI-V transceiver or receiver.
i SEND CONTROL JACK [SEND] (p. 17)
Goes to ground while transmitting to control exter-
nal equipment such as a linear amplifier.
• Max. control level: 16 V DC/0.5 A
CAUTION: Be sure the linear amplifiers keying cir-
cuit control voltage is compatible to the IC-746PRO,
before connecting to [SEND].
o ALC INPUT JACK [ALC] (p. 17)
Connects to the ALC output jack of a non-Icom lin-
ear amplifier.
!0 ACCESSORY SOCKET 2 [ACC(2)]
!1 ACCESSORY SOCKET 1 [ACC(1)]
Enables connection of external equipment such as
a linear amplifier, an automatic antenna selector/
tuner, TNC for data communications, etc.
• See p. 8 for socket information.
!2 STRAIGHT KEY JACK [KEY] (p. 14)
Accepts a straight key or external electronic keyer
with
1
⁄4 inch standard plug.
•[ELEC-KEY] on the front panel can be used for a straight
key or external electronic keyer. Deactivate the internal
electronic keyer in keyer set mode. (p. 34)
!3 TUNER CONTROL SOCKET [TUNER]
(pgs. 15, 77)
Accepts the control cable from an optional AH-4
HF/50 MHz AUTOMATIC ANTENNA TUNER.
If you use an external electronic keyer, make
sure the voltage retained by the keyer is less
than 0.4 V when the key is ON.
!4 CALIBRATION POT [CAL] (p. 94)
This is used for frequency calibration.
•The transceiver has been adjusted and calibrated thor-
oughly at the factory. Under normal circumstances, the
frequency does not need to be re-calibrated.
!5 GROUND TERMINAL [GND] (pgs. 13, 14)
Connect this terminal to a ground to prevent electri-
cal shocks, TVI, BCI and other problems.
(+)
(_)
Rear panel view
IC-7400.qxd 02.4.2 11:35 Page 7
8
1
PANEL DESCRIPTION
2001 NEW
D DATA SOCKET
D ACC SOCKETS
ACC (1)
PIN No.
NAME DESCRIPTION SPECIFICATIONS
1
2
3
4
5
6
7
8
“High” level : More than 2.4 V
1 RTTY Controls RTTY keying “Low” level : Less than 0.6 V
Output current : Less than 2 mA
2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.
Input/output pin.
(HF/50 MHz only)
Ground level : –0.5 V to 0.8 V
3
HSEND
Goes to ground when transmitting.
Output current : Less than 20 mA
When grounded, transmits.
Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
4 MOD
Modulator input. Input impedance : 10 kΩ
Connects to a modulator. Input level : Approx. 100 mV rms
AF detector output.
Output impedance : 4.7 kΩ
5 AF Fixed, regardless of [AF] position in
Output level : 100–300 mV rms
default settings. (see notes below)
6 SQLS
Squelch output. SQL open : Less than 0.3 V/5 mA
Goes to ground when squelch opens.
SQL closed : More than 6.0 V/100 µA
7 13.8 V 13.8 V output when power is ON.
Output current : Max. 1 A
Connected in parallel with ACC(2) pin 7.
Control voltage : –4 V to 0 V
8 ALC ALC voltage input. Input impedance : More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
ACC (2)
PIN No.
NAME DESCRIPTION SPECIFICATIONS
1
2
3
4
5
6
7
1 8 V Regulated 8 V output.
Output voltage : 8 V ±0.3 V
Output current : Less than 10 mA
2 GND Same as ACC(1) pin 2.
3
HSEND
Same as ACC(1) pin 3.
4 BAND
Band voltage output.
Output voltage : 0 to 8.0 V
(Varies with amateur band)
5 ALC Same as ACC (1) pin 8.
Input/output pin (144 MHz only) Ground level : –0.5 V to +0.8 V
6
VSEND
Goes to ground when transmitting. Output current : Less than 20 mA
When grounded, transmits. Input current (Tx) : Less than 200 mA
7
13.8 V
Same as ACC(1) pin 7.
Rear panel view
Rear panel view
DATA
PIN No.
NAME DESCRIPTION
12
34
56
1 DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)
2 GND Common ground for DATA IN, DATA OUT and AF OUT.
3 PTT P PTT terminal for packet operation. Connect ground to transmit data.
4 DATA OUT Data out terminal for 9600 bps operation only.
5 AF OUT Data out terminal for 1200 bps operation only.
Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal
which opens the squelch.
6 P SQL •To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit trans-
mission when receiving signals.
• Keep audio output at a normal level, otherwise a “P SQL
”
signal will not be output.
Rear panel view
IC-7400.qxd 02.4.2 11:35 Page 8
9
1
PANEL DESCRIPTION
2001 NEW 2001 NEW
■ LCD display
q FREQUENCY READOUTS
Shows the operating frequency.
w MULTI-FUNCTION METER INDICATION
➥ Shows receiving signal strength, etc. during re-
ceive.
➥ Shows transmit output power, ALC and SWR dur-
ing transmit.
e VOX INDICATOR (p. 54)
Appears when the VOX function is activated.
r
MICROPHONE COMPRESSOR INDICATOR (p. 57)
Appears when the microphone compressor is acti-
vated.
t MULTI-FUNCTION SWITCH INDICATOR (p. 11)
Indicates the functions assigned to the multi-func-
tion switches ([F1]–[F5]).
y DSP FILTER INDICATOR (p. 49)
Shows the selected IF filter.
u MEMORY CHANNEL READOUTS (p. 61)
Shows the selected memory channel.
i SELECT MEMORY CHANNEL INDICATOR (p. 71)
Appears when the selected memory channel is set
as a select memory channel.
o BLANK MEMORY INDICATOR (p. 61)
Appears when the selected memory channel is
blank.
!0
1
⁄4 TUNING DIAL SPEED INDICATOR (p. 21)
Appears when the tuning dial speed is set so that
one rotation is equal to
1
⁄4 of the normal rotation.
!1 VOICE SQUELCH CONTROL INDICATOR (p. 53)
Appears during VSC (Voice Squelch Control) func-
tion is activated.
!2 MODE INDICATORS (p. 23)
Shows the selected operating mode.
•“D” appears when SSB data, AM data or FM data mode
is selected.
!3 ANTENNA INDICATOR (p. 74)
Indicates which antenna connector is used for
HF/50 MHz.
!4 ANTENNA TUNER INDICATORS (pgs. 75, 76)
➥ “TUNE” appears when the antenna tuner is ON;
“TUNE” appears and flashes during tuning.
➥ “EXT” appears when the optional AH-4 external
antenna tuner is connected to [ANT1].
q
w
t
!0
o
i
u
y
!1!2!3!4
e
r
IC-7400.qxd 02.4.2 11:35 Page 9
10
1
PANEL DESCRIPTION
2001 NEW
■ LCD display (continued)
!5 BREAK-IN INDICATORS (p. 55)
➥ “FBK-IN” appears when the full break-in function
is activated.
➥ “BK-IN” appears when the semi break-in function
is activated.
!6 MONITOR INDICATOR (p. 56)
Appears when the monitor function is activated.
!7 PREAMP INDICATORS (p. 47)
Appears when the preamp is activated.
!8 ATTENUATOR INDICATOR (p. 47)
Appears when the attenuator is activated.
!9 AGC INDICATORS (p. 48)
Shows the selected AGC time constant.
•“F” for AGC fast; “M” for AGC middle; “S” for AGC
slow; “-OFF” for AGC OFF.
@0 NOISE BLANKER INDICATOR (p. 50)
Appears when the noise blanker is activated.
@1 DTCS INDICATOR (p. 43)
Appears during DTCS operation.
@2 TONE SQUELCH INDICATORS
➥ “T” appears when the repeater tone is activated.
(p. 44)
➥ “TSQL” appears during tone squelch operation.
(p. 42)
@3 DUPLEX INDICATOR (p. 44)
“DUP–” or “DUP+” appears during repeater opera-
tion.
@4 NOISE REDUCTION INDICATOR (p. 52)
Appears when the noise reduction is activated.
@5 NOTCH INDICATORS (p. 52)
➥ “NOTCH” appears when the manual notch func-
tion is activated.
➥ “ANOTCH” appears when the automatic notch
function is activated.
@6 SPLIT INDICATOR (pgs. 58, 59)
Appears during split operation.
@7 MEMORY INDICATOR (p. 61)
Appears during memory mode.
@8 VFO INDICATORS (p. 20)
Indicates whether VFO A or VFO B is selected.
@9 RIT/
∂∂
TX INDICATORS (pgs. 47, 56)
Appears during RIT or ∂TX operation and indicates
the frequency offset.
!7
!8
!9
@0
@7
@6
@5
@4
@2
@3
@1
@9
!5
!6
@8
IC-7400.qxd 02.4.2 11:35 Page 10
11
1
PANEL DESCRIPTION
2001 NEW 2001 NEW
■ Multi function switches
DD
M1 FUNCTIONS
During SSB operation
During SSB data operation
During CW operation
During RTTY operation
During AM operation
During FM operation
AGC (p. 48)
➥ Push momentarily to change the time
constant of the AGC circuit.
➥ Push for 1 sec. to enter to the AGC set
mode.
DUPLEX (p. 44)
➥ Push momentarily to select the duplex di-
rection or turn the function OFF.
•“DUP–” or “DUP+” indicator appears during
duplex operation.
➥ Push for 1 sec. to turn the one-touch re-
peater function ON/OFF.
SPEECH COMPRESSOR (p. 57)
➥ Push momentarily to turn the speech
compressor function ON/OFF.
•“COMP” indicator appears when the speech
compressor is ON.
➥ Push for 1 sec. to enter to the compres-
sor set mode.
1
⁄4 TUNING FUNCTION (p. 21)
Push to turn the
1
⁄4 tuning function
ON/OFF.
•“ ” indicator appears when the
1
⁄
4 tuning
function is ON.
TRANSMISSION BANDWIDTH (p. 57)
Push to select the transmission bandwidth.
•Bandwidth is selectable from narrow, middle
and wide.
MEMORY KEYER MENU (p. 29)
Push to select the memory keyer or keyer
send menu, depending on the KEYER
1st Menu setting in the set mode (p. 86).
RTTY MENU (p. 36)
Push to select the RTTY menu.
BAND SCOPE FUNCTION (p. 46)
Push to select the band scope screen.
DD
M2 FUNCTIONS
SCAN MENU (p. 69)
Push to select the scan menu.
MEMORY NAME MENU (p. 66)
Push to select the memory name screen.
SWR GRAPH FUNCTION (p. 60)
Push to indicate the SWR graph screen.
TONE CONTROL SET MODE (p. 88)
Push to enter the audio tone set mode.
VSC FUNCTION (p. 53)
Push to turn the VSC (Voice Squelch Con-
trol) function ON and OFF.
F
5
VSC
F
4
TCN
F
3
SWR
F
2
MEM
F 1
SCN
F 1
F
2F
3
F
4
F
5
SCN MEM SWR TCN VSC
F
5
SCP
F
4
RTY
F
4
KEY
F
4
TBW
F
3
1/4
F
3
CMP
F
2
DUP
F 1
AGC
F 1
F
2F
3
F
4
F
5
AGC DUP CMP TON SCP
F 1
F
2F
3
F
4
F
5
AGC DUP CMP SCP
F 1
F
2F
3
F
4
F
5
AGC DUP 1/4 RTY SCP
F 1
F
2F
3
F
4
F
5
AGC DUP 1/4 KEY SCP
F 1
F
2F
3
F
4
F
5
AGC DUP 1/4 SCP
F 1
F
2F
3
F
4
F
5
AGC DUP CMP TBW SCP
IC-7400.qxd 02.4.2 11:35 Page 11
■ Microphone (HM-36)
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
•Continuous pushing changes the frequency or memory
channel number continuously.
•While pushing [XFC], the transmit readout frequency can
be controlled while in spilt frequency operation.
•The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p. 34)
•MICROPHONE CONNECTOR
(Front panel view)
• HM-36 SCHEMATIC DIAGRAM
w PTT SWITCH
Push and hold to transmit; release to receive.
CAUTION: DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator.
NOTE: DC voltage is applied to pin 1 for micro-
phone operation. Take care when using a non-Icom
microphone.
y GND (PTT ground)
t PTT
r Main readout squelch switch
q Microphone input
w +8 V DC output
e Frequency up/down
u GND
(Microphone ground)
i Main readout AF output
(varies with [AF]/[BAL])
q
w
[MIC]
FUNCTION DESCRIPTION
Pin No.
w +8 V DC output Max. 10 mA
e
Frequency up Ground
Frequency down Ground through 470 Ω
r
Squelch open “Low” level
Squelch closed “High” level
+
+
q
w
e
r
t
y
u
i
4700p
4700p
10µ
0.33µ
MICROPHONE
MIC
ELEMENT
2k
470
DOWN UP
PTT
RECEIVE
TRANSMIT
MICROPHONE CABLE MICROPHONE PLUG
12
1
PANEL DESCRIPTION
2001 NEW
IC-7400.qxd 02.4.2 11:35 Page 12
2
13
INSTALLATION AND CONNECTIONS
2001 NEW
■ Unpacking
After unpacking, immediately report any damage to the
delivering carrier or dealer. Keep the shipping cartons.
For a description and a diagram of accessory equip-
ment included with the IC-7400, see ‘Supplied acces-
sories’ on p. ii of this manual.
■ Selecting a location
Select a location for the transceiver that allows ade-
quate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna ele-
ments, radios and other electromagnetic sources.
The base of the transceiver has an adjustable stand
for desktop use. Set the stand to one of two angles de-
pending on your operating conditions.
■ Grounding
To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other prob-
lems, ground the transceiver through the GROUND
terminal on the rear panel.
For best results, connect a heavy gauge wire or strap
to a long earth-sunk copper rod. Make the distance be-
tween the [GND] terminal and ground as short as pos-
sible.
R WARNING: NEVER connect the [GND]
terminal to a gas or electric pipe, since the connec-
tion could cause an explosion or electric shock.
■ Antenna connection
For radio communications, the antenna is of critical im-
portance, along with output power and sensitivity. Se-
lect antenna(s), such as a well-matched 50 Ω antenna,
and feedline. 1.5:1 or better of Voltage Standing Wave
Ratio (VSWR) is recommended for your desired band.
Of course, the transmission line should be a coaxial
cable.
When using 1 antenna, use the [ANT1] connector.
CAUTION: Protect your transceiver from lightning
by using a lightning arrestor.
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transis-
tor. In this case, an antenna tuner is useful to match
the transceiver and antenna. Low SWR allows full
power for transmitting even when using the antenna
tuner. The IC-7400 has an SWR meter to monitor
the antenna SWR continuously.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm ≈
9
⁄8
in 10 mm ≈
3
⁄8
in 1–2 mm ≈
1
⁄16
in
30 mm
10 mm (soft solder)
10 mm
1–2 mm
solder solder
Soft
solder
Coupling ring
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Slide the connector
body on and solder it.
Screw the coupling
ring onto the
connector body.
Strip the cable as
shown at left. Soft sol-
der the center con-
ductor.
q
w
e
r
IC-7400.qxd 02.4.2 11:35 Page 13
2
14
INSTALLATION AND CONNECTIONS
■ Required connections
• Front panel
• Rear panel
i7400
POWER
F
1
MENU SSB
F
2
CW/RTTY
F
3
AM/FM
F
4
FILTER
F
5
XFC
MP-W
GENE
50
MP-R
0
21
7
24
8
28
9
10
4
14
5
18
6
1. 8
1
3.5
2
7
3
144
ENT
TS
A/B
SPLIT
F-INP
V/M
M-CL
PBTC
MW
TWIN PBT
M-CH
LOCK/
SPCH
∂TXRIT
CLEAR
RIT/∂TX
CALL
MONITOR
VOX/BK-IN
NB
P.AMP/ATT
KEY SPEED
CW PITCH
RF PWR
MIC GAIN
HF/VHF TRANSCEIVER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER
ANT
NR
NOTCH
AF
RF/SQL
NR
A/NOTCH
CW KEY
MICROPHONES (p. 100)
A straight key can be used
when the internal electronic
keyer is turned OFF in keyer
set mode. (p. 34)
HM-36 SM-20
(optional)
(dot)
(com)
(dash)
GROUND (p. 13)
Use the heaviest gauge wire or
strap available and make the
connection as short as possible.
Grounding prevents electrical
shocks, TVI and other problems.
ANTENNA 1, 2 (pgs. 13, 74)
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands
DC POWER SUPPLY
STRAIGHT KEY
PS-125
(Optional)
144 MHz ANTENNA (pgs. 13, 74)
Connect a VHF
(60–144 MHz)
antenna;
impedance: 50 Ω.
(+)
(_)
IC-7400.qxd 02.4.2 11:35 Page 14
■ Advanced connections
• Front panel
• Rear panel
15
2
INSTALLATION AND CONNECTIONS
2001 NEW 2001 NEW
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
NR
A
/NOTCH
TUNER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TWIN PBT
M-CH
RIT
CLEAR
∂TX
RIT/∂TX
TS
SPLIT
PBTC
F-INP
A/B
V/M
MW
M-CL
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i7400
MENU
SSB
CW/RTTY
AM/FM
FILTER
HEADPHONES
MIC
The AFSK modulation signal
can be input from [MIC]. (p. 77)
AH-2b
AH-4 (p. 76)
ANTENNA 1, 2 (p. 17)
Connects a linear amplifier,
antenna selector, etc.
[SEND], [ALC] (p. 17)
Used for connecting a
non-Icom linear ampli-
fier.
When using the AH-4, it must
be connected to the [ANT1]
connector.
[REMOTE] (p. 94)
Used for computer control and transceive operation.
[DATA] (p. 77)
EXTERNAL SPEAKER (p. 100)
SP-21
(optional)
ACC SOCKETS (pgs. 8, 77)
IC-7400.qxd 02.4.2 11:35 Page 15
16
2
INSTALLATION AND CONNECTIONS
2001 NEW
■ Power supply connections
Use an optional DC power supply with a 25 A capacity
and above when operating the transceiver with AC
power. Refer to the diagrams below.
CONNECTING PS-125 DC POWER SUPPLY
CONNECTING A DC POWER SUPPLY
CONNECTING A VEHICLE BATTERY
30 A fuses
AC cable
Transceiver
• Connecting with OPC-025D • Connecting with OPC-639
AC outlet
A DC power supply
13.8 V
; at least 23 A
Black
_
Red
+
to DC power
socket
Supplied DC
power cable
(OPC-025D)
30 A fuses
AC cable
Transceiver
AC outlet
A DC power supply
13.8 V
; at least 23 A
Black
_
Red
+
to DC power
socket
to ground
terminal
Supplied
DC power cable
(OPC-639)
12 V
battery
Supplied
DC power cable
+ red
_ black
Crimp
Solder
Grommet
NEVER connect to
a 24 V battery.
NOTE: Use terminals for
the cable connections.
NEVER connect to a battery without supplied DC
fuses, otherwise a fire hazard may occur.
PS-125
Connect to an AC outlet
using the supplied AC cable.
DC power cable
DC power
socket
Transceiver
CAUTION: Before connecting the DC power
cable, check the following important items. Make
sure:
• The [POWER] switch is OFF.
•Output voltage of the power source is 12–15 V
when you use a non-Icom power supply.
• DC power cable polarity is correct.
Red : positive + terminal
Black : negative _ terminal
IC-7400.qxd 02.4.2 11:35 Page 16
2001 NEW
17
2
INSTALLATION AND CONNECTIONS
2001 NEW
■ Linear amplifier connections (not usable in European countries)
CONNECTING THE IC-PW1
Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
R WARNING:
Set the transceiver output power and linear ampli-
fier ALC output level referring to the linear amplifier
instruction manual. Be sure the linear amplifier key-
ing circuit control voltage is compatible with the IC-
746PRO, before connecting to [SEND] jack.
The ALC input level must be in the range 0 V to –4
V, and the transceiver does not accept positive volt-
age. Non-matched ALC and RF power settings
could cause a fire or ruin the linear amplifier.
The specifications for the SEND relay are 16 V/DC
0.5 A. If this level is exceeded, a large external
relay must be used.
■ External antenna tuner connection
CONNECTING THE AH-4
The AH-4 must be connected to [ANT1].
To an
antenna
ACC(1)
ANT
ANT1
ACC(2)
INPUT1
REMOTE
EXCITER
1
1&2
GND
GND
IC-PW1
AC outlet
(Non-European versions: 100—120/220—240 V
European version : 230 V)
Ground
Transceiver
REMOTE
Remote control cable (supplied with the IC-PW1)
ACC cable (supplied with the IC-PW1)
Be sure to connect the cable
to the 7-pin ACC(2) jack.
Coaxial cable
(supplied with the IC-PW1)
Coaxial cable (from AH-4)
ANT1
Transceiver
Ground
AH-4
Control cable
Long wire or optional AH-2b
Use the [ANT1] connector when connecting a linear amplifier.
IC-7400.qxd 02.4.2 11:35 Page 17
Before first applying power, make sure all connections
required for your system are complete by referring to
Chapter 2. Then, reset the transceiver using the fol-
lowing procedure.
NOTE: When first applying power or when operat-
ing in cold environments, the display may flicker or
appear faint. This is normal and will disappear once
the transceiver has warmed up.
q Make sure the transceiver power is OFF.
w While pushing [M-CL] and [F-INP], push [POWER]
for 1 sec. to turn power ON.
• The internal CPU is reset.
•The transceiver displays its initial VFO frequency when
resetting is complete.
e Correct the set mode settings after resetting, if de-
sired.
Resetting CLEARS all programmed contents in
memory channels and returns programmed values
in set mode to default values.
3
18
BASIC OPERATION
■ When first applying power (CPU resetting)
■ Initial settings
After resetting the transceiver, set controls and
switches as shown in the figure below.
CW : Clockwise
CCW : Counterclockwise
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
NR
A
/NOTCH
TUNER
ANT
HF/VHF TRANSCEIVER
NR
NOTCH
AF
MIC GAIN
RF PWR
CW PITCH
F 1
F
2F
3
F
4
F
5
XFC
MP
-
W
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
MP
-
R
TX
RX
LOCK
TWIN PBT
M-CH
RIT
CLEAR
∂TX
RIT/∂TX
TS
SPLIT
PBTC
F-INP
A/B
V/M
MW
M-CL
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
RF/SQL
i7400
MENU
SSB
CW/RTTY
AM/FM
FILTER
[NR]: Max. CCW [NOTCH]: Max. CCW
[AF]: Max. CCW
[TRANSMIT]: OFF
[MIC GAIN]: Max. CCW
[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock
[RF/SQL]: 12 o’clock
[KEY SPEED]: Max. CCW
[POWER] [F-INP] [M-CL]
2001 NEW
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19
3
BASIC OPERATION
2001 NEW 2001 NEW
■ Selecting an operating band
The transceiver has a triple band stacking register.
This means that the last 3 operating frequencies and
modes used on a particular band are automatically
memorized.
See the table below for a list of the bands available
and the default settings for each register.
D Using the band stacking registers
q Push [14
5
], then select a frequency and an operat-
ing mode.
•Frequency and operating mode are memorized in the
first band stacking register.
w Push [14
5
] again, then select another frequency
and operating mode.
•This frequency and operating mode are memorized in
the second band stacking register.
e Push [14
5
] again, then select another frequency
and operating mode.
•This frequency and operating mode are memorized in
the third band stacking register.
•When a fourth frequency and operating mode are se-
lected on a band, the first register set in step q, is over-
written.
Band keys
BAND REGISTER 1 REGISTER 2 REGISTER 3
1.8 MHz 1.900000 MHz CW 1.910000 MHz CW 1.915000 MHz CW
3.5 MHz 3.550000 MHz LSB 3.560000 MHz LSB 3.580000 MHz LSB
7 MHz 7.050000 MHz LSB 7.060000 MHz LSB 7.020000 MHz CW
10 MHz 10.120000 MHz CW 10.130000 MHz CW 10.140000 MHz CW
14 MHz 14.100000 MHz USB 14.200000 MHz USB 14.050000 MHz CW
18 MHz 18.100000 MHz USB 18.130000 MHz USB 18.150000 MHz USB
21 MHz 21.200000 MHz USB 21.300000 MHz USB 21.050000 MHz CW
24 MHz 24.950000 MHz USB 24.980000 MHz USB 24.900000 MHz CW
28 MHz 28.500000 MHz USB 29.500000 MHz USB 28.100000 MHz CW
50 MHz 50.100000 MHz USB 50.200000 MHz USB 51.000000 MHz FM
144 MHz 145.000000 MHz FM 145.100000 MHz FM 145.200000 MHz FM
General 15.000000 MHz USB 15.100000 MHz USB 15.200000 MHz USB
[Example]: 14 MHz band
GENE
50
0
21
7
24
8
28
9
14
5
10
4
18
6
3.5
2
1. 8
1
7
3
144
ENT
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3
BASIC OPERATION
2001 NEW
■ Selecting VFO/memory mode
VFO is an abbreviation of Variable Frequency Oscilla-
tor, and is commonly referred to as a main tuning func-
tion. The tuning dial is often called the “VFO knob.”
➥ Push [V/M] to switch between VFO and memory
modes.
•Pushing [V/M] for 1 sec. transfers the contents of the se-
lected memory channel to VFO mode (p. 65).
■ VFO operation
The transceiver has 2 VFOs and are called VFO A and
VFO B. You can use the desired VFO to call up a fre-
quency and operating mode for your operation.
DD
Selecting the VFO A/B
➥ Push [A/B] to switch between the VFO A and
VFO B.
•“VFO A” or “VFO B” appears.
DD
VFO equalization
➥ Push [A/B] for 1 sec. to equalize the undisplayed
VFO condition to the displayed VFO.
•3 beeps sound when the VFO equalization is completed.
CONVENIENT
Use two VFOs as a quick memory
When you find a new station, but you wish to continue
searching, the Two VFO system can be used for quick mem-
ory storage.
q Push [A/B] for 1 sec. to store the displayed frequency into
the undisplayed VFO.
w Continue searching for stations.
e Push [A/B] to retrieve the stored frequency.
r To continue searching for a station, push [A/B] again.
[A/B]
Either one appears
Push for 1 sec.
A/B
[V/M]
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3
BASIC OPERATION
2001 NEW 2001 NEW
■ Frequency setting
The transceiver has several tuning methods for conve-
nient frequency tuning.
DD
Tuning with the tuning dial
q Push the desired band key on the keypad 1–3
times.
•3 different frequencies can be selected on each band
with the band key. (p. 19)
w Rotate the tuning dial to set the desired frequency.
If the dial lock function is activated, the lock indicator
lights, and the tuning dial does not function. In this
case, push [LOCK/SPCH] to deactivate the lock
function. (see p. 52 for details)
DD
Quick tuning step
The operating frequency can be changed in kHz steps
(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for
quick tuning.
q Push [SSB], [CW/RTTY] or [AM/FM] to select the
desired operation mode.
w Push [TS] momentarily to activate the quick tuning
function.
•“▼” appears.
e Push [TS] for 1 sec. to enter the tuning step set
mode.
r Rotate the tuning dial to select the desired tuning
step.
t Push [TS] to exit the tuning step set mode.
DD
1
⁄4 Tuning step function (SSB data, CW and RTTY only)
While operating in SSB data/CW/RTTY, the
1
⁄4 function
is available for critical tuning. Dial rotation is reduced to
1
⁄4 of normal when the
1
⁄4 function is in use.
➥ While M1 is selected with [MENU], push [F3 1/4]
to toggle the
1
⁄4 function ON and OFF.
D Auto tuning step function
When rotating the tuning dial rapidly, the tuning step
automatically changes several times as selected.
q Push [MENU] for 1 sec. to enter the set mode.
w Push [F1≤] or [F2 ≥] to select the DIAL Auto
TS item.
e Rotate the tuning dial to select the function ON
(HIGH or LOW) and OFF.
• HIGH : Approx. 5 times faster
• LOW : Approx. 2 times faster
• OFF : Auto tuning step is turned OFF.
r Push [MENU] to exit the set mode.
Band keys
Tuning dial
[TS]Select mode
1kHz
SSB
1
⁄4 indicator
27
HIGH
DIAL
Auto
TS
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3
BASIC OPERATION
2001 NEW
DD
Selecting the 1 Hz step
The minimum tuning step of 1 Hz can be used for fine
tuning.
q Push [TS] momentarily to turn the quick tuning step
OFF
•“▼” disappears.
w Push [TS] for 1 sec. to toggle the 1 Hz tuning step
ON and OFF.
DD
Band edge warning beep
When selecting a frequency that lies outside of a
band’s specified frequency range, a warning beep
sounds.
This function can be turned OFF in set mode, if de-
sired. (p. 81)
DD
Frequency setting with the keypad
The transceiver has a keypad for direct frequency
entry as described below.
q Push [F-INP].
• F-INP indicator lights
w Input the desired frequency.
•Input “•” (decimal point) between the MHz units and kHz
units.
e Push [144 ENT] to enter the input frequency.
• To cancel the input, push [A/B] instead of [144 ENT].
Lights when keypad input is activated.
Keypad [F-INP]
21.280 MHz 21.245 MHz
14.025 MHz
Push
[EXAMPLE]
50
0
21
7
14
5
10
4
10
4
18
6
3.5
2
1. 8
1
F-INP
GENE
50
0
50
0
3.5
2
GENE
14
5
144
ENT
706 kHz
Push
144
ENT
144
ENT
F-INP
GENE
Push
F-INP
[TS]
1 Hz indicator
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3
BASIC OPERATION
2001 NEW 2001 NEW
■ Operating mode selection
SSB (USB/LSB), SSB data (USB data/LSB data), CW,
CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse),
AM, AM data, FM and FM data modes are available in
the IC-7400. Select the desired operation mode as fol-
lows.
To select a mode of operation, push the desired mode
switch momentarily. Push the switch again to toggle
between USB and LSB, CW/CW-R and RTTY/RTTY-
R, AM and FM, if necessary. Push the switch for 1 sec.
to toggle between CW and CW-R, RTTY and RTTY-R,
or to select data mode, if necessary.
See the diagram below right for the order of selection.
Microphone signals are muted when data mode is
selected.
• Selecting SSB mode
➥ Push [SSB] to select USB or LSB.
•USB is selected first when above 10 MHz; or LSB is se-
lected first when below 10 MHz operation.
•After USB or LSB is selected, push [SSB] to toggle be-
tween USB and LSB.
•After USB or LSB is selected, push [SSB] for 1 sec. to
select USB data or LSB data mode, respectively.
• Selecting CW/RTTY mode
➥ Push [CW/RTTY] to select CW or RTTY.
•After CW/CW-R or RTTY/RTTY-R is selected, push
[CW/RTTY] to toggle between CW and RTTY.
•After CW or RTTY is selected, push [CW/RTTY] for
1 sec. to toggle between CW and CW reverse, or, RTTY
and RTTY reverse mode, respectively.
• Selecting AM/FM mode
➥ Push [AM/FM] to select AM or FM.
•After AM or FM is selected, push [AM/FM] to toggle be-
tween AM and FM mode.
•After AM or FM is selected, push [AM/FM] for 1 sec. to
select AM data or FM data mode, respectively.
■ Volume setting
➥ Rotate [AF] control to output a suitable audio level.
AF RF/SQL
No audio output
Max. audio output
Decreases Increases
[SSB] [CW/RTTY] [AM/FM]
SSB
CW/RTTY
AM/FM
D USB USB
CW-R CW
D AM AM
Push mode switch
for 1 sec.
Push mode switch
momentarily.
LSB D LSB
RTTY RTTY-R
FM D FM
[AF] control
IC-7400.qxd 02.4.2 11:35 Page 23
3
BASIC OPERATION
24
2001 NEW
Adjusts the RF gain and squelch threshold level. The
squelch removes noise output from the speaker
(closed position) when no signal is received.
•The squelch is particularly effective for FM. It is also avail-
able for other modes.
•The control can be set as the RF gain control only (squelch
is fixed open) or squelch control (RF gain is fixed at maxi-
mum) in set mode (p. 81). See below right.
•The 11 to 12 o’clock position is recommended for any set-
ting of the [RF/SQL] control.
Adjusting RF gain (Receive sensitivity)
Normally, [RF/SQL] is set to the 11 o’clock position.
Rotate [RF/SQL] to the 11 o’clock position for maxi-
mum sensitivity.
•Rotating counterclockwise from the maximum position re-
duces sensitivity.
• The S-meter indicates receive sensitivity.
Adjusting squelch (Removing non-signal noise)
Rotate [RF/SQL] clockwise when receiving no signal,
until the noise just disappears.
• [RX] indicator light goes out.
•Rotating [RF/SQL] past the threshold point invokes the S-
meter squelch— this allows you to set a minimum signal
level needed to open the squelch.
• When setting as RF gain/squelch control
• When functioning as RF gain control (Squelch is
fixed open; SSB, CW, RTTY only)
•When functioning as squelch control (RF gain is
fixed at maximum)
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM mode)
Shallow Deep
Noise squelch (FM mode)
Minimum RF gain
Adjustable
range
Maximum
RF gain
Recommended level
RF gain
adjustable
range
Maximum
RF gain
S-meter
squelch
Noise squelch (FM mode)
Squelch is
open.
■ Squelch and receive (RF) sensitivity
[RF/SQL] control
SET MODE OPERATION
RF+SQL
Can be used in all modes.
(default)
Functions as noise squelch or S-meter
squelch in AM and FM; S-meter
squelch only in other modes.
SQL
➥ Operates as a squelch control.
• RF gain is fixed at max. sensitivity.
➥ Operates as an RF gain control in
SSB, CW and RTTY.
AUTO •Squelch is fixed open.
➥ Operates as a squelch control in AM
and FM.
• RF gain is fixed at max. sensitivity.
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3
BASIC OPERATION
2001 NEW 2001 NEW
■ Basic transmit operation
DD
Transmitting
Before transmitting, monitor your selected operating
frequency to make sure transmitting won’t cause inter-
ference to other stations on the same frequency.
q Push [TRANSMIT] or [PTT] (microphone) to trans-
mit.
• The [TX] indicator lights red.
w Push [TRANSMIT] again or release [PTT] (micro-
phone) to return to receive.
DD
Microphone gain adjustment
Before transmitting, monitor your selected operating
frequency to make sure transmitting won’t cause inter-
ference to other stations on the same frequency.
q Push [PTT] (microphone) to transmit.
• Talk into the microphone at your normal voice level.
w While talking into the microphone, rotate [MIC
GAIN] so that the ALC meter reading doesn’t go
outside the ALC zone (see right).
e Release [PTT] (microphone) to return to receive.
[TRANSMIT]
[RF PWR][MIC GAIN]
[TX] indicator
ALC zone
Before transmitting, monitor your selected oper-
ating frequency to make sure transmitting won’t
cause interference to other stations on the same
frequency. It’s good Amateur practice to listen
first, and then, even if nothing is heard, ask “is
the frequency in use” once or twice, before you
begin operating on that frequency.
IC-7400.qxd 02.4.2 11:35 Page 25
2001 NEW
4
26
RECEIVE AND TRANSMIT
■ Operating SSB
q Push a band key to select the desired band.
w Push [SSB] to select LSB or USB.
•Below 10 MHz LSB is automatically selected; above
10 MHz USB is automatically selected.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
t Push [TRANSMIT] or [PTT] (microphone) to trans-
mit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
Band keys[TX] indicator[TRANSMIT]
[MIC GAIN] [SSB] Tuning dial
“LSB” or “USB” appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥
Push [NR] to turn the noise reduction ON and OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Auto notch filter (p. 52)
➥ Push [A/NOTCH] to turn the auto or manual
notch function ON and OFF.
•Rotate [NOTCH] control to set the attenuating fre-
quency for manual notch operation.
• Twin PBT (passband tuning) (p. 51)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 48)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
• VSC (voice squelch control) (p. 53)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
•The VSC indicator appears when the voice squelch
function is set to ON.
DD
Convenient functions for transmit
• Speech compressor (p. 57)
➥ While M1 is selected with [MENU], push
[F3 CMP] to turn the speech compressor ON and
OFF.
•“COMP” appears when the speech compressor is set
to ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
•“VOX” appears when the VOX function is set to ON.
• Transmit quality monitor (p. 56)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
•“MONI” appears when the monitor function is set to
ON.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
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4
RECEIVE AND TRANSMIT
2001 NEW 2001 NEW
■ Operating CW
q Push a band key to select the desired band.
w Push [CW/RTTY] to select CW.
•After CW mode is selected, push [CW/RTTY] for 1 sec.
to toggle between CW and CW-R modes.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to simultaneously tune a de-
sired signal and its side tone.
• S-meter indicates received signal strength.
t Push [TRANSMIT] to transmit.
• The TX indicator lights red.
y Use the electric keyer or paddle to key your CW sig-
nals.
• The Po meter indicates transmitted CW signal strength.
u Adjust CW speed with [KEY SPEED].
i Push [TRANSMIT] to return to receive.
Band keys[TX] indicator[TRANSMIT]
[CW PITCH]
[KEY SPEED]
[CW/RTTY]
Tuning dial
“CW” or “CW-R” appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥
Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥ Push [NR] to turn the noise reduction ON and
OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Auto notch filter (p. 52)
➥ Push [A/NOTCH] to turn the auto or manual
notch function ON and OFF.
•Rotate [NOTCH] control to set the attenuating fre-
quency for manual notch operation.
• Twin PBT (passband tuning) (p. 51)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 48)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
•
1
⁄4 function (p. 21)
➥ While M1 is selected with [MENU], push
[F3 1/4] to turn the
1
⁄4 function ON and OFF.
DD
Convenient functions for transmit
• Break-in function (p. 55)
➥ Push [VOX/BK-IN] several times to set the break-
in OFF, semi break-in or full break-in.
•“BK-IN” or “F BK-IN” appears when the semi break-in
or full break-in is set to ON, respectively.
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4
RECEIVE AND TRANSMIT
2001 NEW
DD
About CW reverse mode
CW reverse mode receives CW signals with a reverse
side CW carrier point like that of LSB and USB modes.
Use when interfering signals are near a desired signal
and you want to change the interference tone.
q Push [CW/RTTY] several times to select CW mode.
w Push [CW/RTTY] for 1 sec. to select CW or CW-R
mode.
• Check the interfering tone.
DD
About CW pitch control
The received CW audio pitch and monitored CW audio
can be adjusted to suit your preference (300 to 900 Hz
in 25 Hz steps) without changing the operating fre-
quency.
DD
About keying speed
The transceiver’s internal electronic keyer speed can
be adjusted from 6 to 60 wpm.
➥ Rotate [KEY SPEED] clockwise to increase keying
speed; counterclockwise to decrease keying speed.
DD
CW side tone function
When the transceiver is in the receive condition (and
the break-in function is OFF— p. 55) you can listen to
the tone of your CW signal without actually transmit-
ting. This allows you to match your transmit signal ex-
actly to another station’s. This also convenient for CW
practice. CW side tone level can be adjusted in keyer
set mode (p. 33).
Push for 1 sec.
BFO
CW-R mode (USB side)
BFO
Desired signal
CW mode (LSB side)
Interference
Desired signalInterference
CW/RTTY
[CW PITCH]
[KEY SPEED]
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4
RECEIVE AND TRANSMIT
2001 NEW 2001 NEW
■ Electronic keyer functions
The transceiver has a number of convenient functions
for the electronic keyer that can be accessed from the
memory keyer menu.
q Push [CW/RTTY] to select CW mode.
w Push [MENU] to select M1.
e Push [F4 KEY] to select the memory keyer menu.
•The selectable menu can be changed with the keyer
send menu in the set mode. (p. 86)
r Push one of the multi-function keys ([F1] to [F5]) to
select an item in the memory keyer menu. See the
diagram below.
• Push [MENU] to return to the previous indication.
DD
IN CW MODE
F
1F
2F
3F
4F
5
F
1F
2F
3F
4F
5
F
1F
2F
3F
4F
5
F
1F
2F
3F
4F
5
F
1F
2F
3F
4F
5
F
1F
2F
3F
4F
5
AGC
DUP
1/4
KEY
SCP
M1
M2
M3
M4
-1
5O%1
Side
Tone
Level
Normal1
Number
Style
CQ
TEST
CQ
TEST
M1
ç
å
DEL
SPC
Push [F4]
Push [MENU]
Push
[F4]
Push
[F2]
Push
[F3]
Push
[F5]
• Keyer send menu (p. 30)
SND
EDT
001
SET
• Memory keyer menu
• Keyer set mode (p. 33)
• Contest number set mode (p. 32)
• Edit menu (p. 31)
[MENU] [CW/RTTY]
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RECEIVE AND TRANSMIT
2001 NEW
F 1
F
2F
3
F
4
F
5
F
2
F 1
F
4
F
3
Repeat indicators Count up trigger
indicator
Counter
M1
M2
M3
M4
-1
M1
M2
M3
M4
-1
M2 send indication
M1
M2
M3
M4
-1
CQ
TEST
CQ
001
CQ
TEST
CQ
001
QRZ?
M1
M2
M3
M4
-1
UR
5NN001
B
001
001
M1
M2
M3
M4
-1
UR
5NN001
B
001
CFM
TU
001
M1 send indication
M2 send indicationRepeat send indication
M1
M2
M3
M4
-1
M4 send indication
M1
M2
M3
M4
-1
M3 send indication
DD
Memory keyer send menu
Pre-set characters can be sent using the keyer send
menu. Contents of the memory keyer are set using the
edit menu.
• Transmitting
q While M1 is selected in CW mode, push [F4 KEY]
to select the memory keyer menu.
w Push [F2 SND] to select the keyer send menu.
e Push [TRANSMIT] to set the transceiver to trans-
mit, or set the break-in function ON (p. 55).
r Push one of the function keys ([F1] to [F4]) to send
the contents of the memory keyer.
•Pushing a function key for 1 sec. repeatedly sends the
contents; push any function key to cancel the transmis-
sion.
•The contest number counter, above [F5], is incremented
each time the contents are sent.
•Push [F5] to reduce the contact number count by 1 when
resending contents to unanswered calls.
For your information
When an external keypad is connected to the
pin 3 and pin 7 of the [MIC] connector, the pro-
grammed contents, M1—M4, can be transmitted
without selecting the keyer send menu.
See p. 86 for details.
t Push [MENU] 2 times to return to M1.
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RECEIVE AND TRANSMIT
2001 NEW 2001 NEW
DD
Editing a memory keyer
The contents of the memory keyer memories can be
set using the memory keyer edit menu. The memory
keyer can memorize and re-transmit 4 CW key codes
for often-used CW sentences, contact numbers, etc.
Total capacity of the memory keyer is 50 characters
per memory channel.
• Programming contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F3 EDIT] to select edit menu.
•Memory keyer contents of the Channel 1 (M1) is indi-
cated.
• Push [F5] to manually increment the contest number.
e Push [F1] to select the desired memory keyer chan-
nel to be edited.
r Input the desired character by rotating the tuning
dial or by pushing the keypad for number input.
• Selectable characters (with the tuning dial);
NOTE:
“^” is used to transmit a following word with no
space such as
AR
. Put “^” before a text string
such as ^AR, and the string “
AR
” is sent with no
space.
“*” is used to insert the CW contact number. The
contact number automatically increments by 1.
This function is only available for one memory
keyer channel at a time. Memory keyer channel
M2 used “*” by default.
t Push [F2 ç] or [F3 å] to move the cursor back-
wards or forwards, respectively.
y Repeat steps r and t to input the desired charac-
ters.
u Push [MENU] 2 times to return to M1.
Pre-programmed contents
A B C D E F G H I J K L M N O P Q R S T
U V W X Y Z / ? . , * ^
CH Contents
M1 CQ TEST CQ TEST DE JA1 JA1 TEST
M2 UR 5NN* BK
M3 CFM TU
M4 QRZ?
F 1
F
2F
3
F
4
F
5
CQ
TEST
CQ
TEST
M1
ç
å
DEL
SPC
UR
5NN*
BK
M2
ç
å
DEL
SPC
• Edit menu
¥ M2 default indication
CFM
TU
M3
ç
å
DEL
SPC
¥ M3 default indication
QSL
TU
DE
JA3Y
M3
ç
å
DEL
SPC
DE
JA3YUA
TEST
M3
ç
å
DEL
SPC
Example display— when inputting QSL TU
DE JA3YUA TEST into M3.
QRZ?
M4
ç
å
DEL
SPC
¥ M4 default indication
Select M1 to M4
Move cursor left/right
Clear character
Input space
When inputting an asterisk,
the counter is incremented by 1.
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DD
Contest number set mode
This menu is used to set the contest (serial) number
and count up trigger, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F4 001] to enter the contest number set
mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
•Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
F 1
F
2F
3
F
4
F
5
1
Set item up/down
5O%
Side
Tone
Level
2. Count Up Trig
This selects which of the four memory slots will have
the contest serial number exchange. The count up
trigger allows the serial number to e automatically in-
cremented after each complete serial number ex-
change is sent.
• M1, M2, M3 and M4 can be set. (default: M2)
M22
Count
Up
Trig
1. Number Style
This item sets the numbering system used for contact
(serial) numbers— normal or morse cut numbers.
•Normal : Does not use morse cut number
(default)
•190 ANO : Sets 1 as A, 9 as N and 0 as O.
•190 ANT : Sets 1 as A, 9 as N and 0 as T.
• 90 NO : Sets 9 as N and 0 as O.
• 90 NT : Sets 9 as N and 0 as T.
Normal1
Number
Style
3. Present Number
This item shows the current number for the count up
trigger channel set above.
•Rotate the tuning dial to change the number, or push
[F3 CLR] for 1 sec. to reset the current number to 001.
CLR
0013
Present
Number
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DD
Keyer set mode
This set mode is used to set the CW side tone, mem-
ory keyer repeat time, dash weight, paddle specifica-
tions, keyer type, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F5 SET] to select keyer set mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
•Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
F 1
F
2F
3
F
4
F
5
1
Set item up/down
5O%
Side
Tone
Level
1. Side Tone Level
This item sets the CW side tone output level.
• 0 to 100% in 1% steps can be selected.
5O%1
Side
Tone
Level
2. Side Tone L-lmt
This item sets the CW side tone level limit. When the
[AF] control is rotated above a specified level, the CW
side tone does not increase.
ON CW side tone level is limited. (default)
OFF CW side tone level is not limited.
ON2
Side
Tone
L-lmt
3. Repeat Time
When sending CW using the repeat timer, this item
sets the time between transmission.
• 1 to 60 sec. in 1 sec. steps can be selected.
2s3
Repeat
Time
4. Dot/Dash Ratio
This item sets the dot/dash ratio.
• 1:1:2.8 to 1:1:4.5 (in 0.12 steps) can be selected.
Keying weight example: Morse code “K”
1:1:3.O4
Dot/Dash
Ratio
DASH
Weight setting:
1:1:3 (default)
Weight setting:
Adjusted
DASH
DOT (fixed*)
Ad
j
ustable ran
g
e SPACE
(
fixed*
)
*SPACE and DOT length can be
adjusted with [KEY SPEED] only.
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5. Rise Time
This item sets the envelop time period which the out-
put power becomes the set transmit power.
• 2, 4, 6 or 8 msec. can be selected.
4ms5
Rise
Time
Key action
Tx output power
• About rise time
Tx
Rx
Set Tx power level
Time
6. Paddle Polarity
This item sets the paddle polarity.
• Normal and reverse polarity can be selected.
NORMAL6
Paddle
Polarity
7. Keyer Type
This item selects the keyer type for [ELEC-KEY] con-
nector on the front panel.
• ELEC-KEY, BUG KEY and Straight key can be selected.
ELEC-KEY7
Keyer
Type
8. MIC U/D Keyer
This item allows you to set the microphone [UP]/[DN]
keys to be used as a paddle.
ON [UP]/[DN] switches can be used for CW.
OFF [UP]/[DN] switches cannot be used for
CW.
NOTE: When “ON” is selected, the frequency and
memory channel cannot be changed using
the [UP]/[DN] switches.
OFF8
MIC
U/D
Keyer
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■ Operating RTTY (FSK)
Before operating RTTY, be sure to consult the manual
that comes with your TNC.
q Push a band key to select the desired band.
w Push [CW/RTTY] several times to select RTTY.
• After RTTY mode is selected, push [CW/RTTY] for
1 sec. to toggle RTTY and RTTY-R modes.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
•If the received signal cannot be demodulated, try select-
ing RTTY-R mode.
t Push [TRANSMIT] to set the transceiver to the
transmit condition or transmit a SEND signal from
your TNC.
• The TX indicator lights red.
•
The Po meter indicates transmitted RTTY signal strength.
y Operate the connected PC or TNC (TU) to transmit
RTTY (FSK) signals.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] to return to receive.
Band keys[TX] indicator[TRANSMIT]
[CW/RTTY] Tuning dial
“RTTY” or “RTTY-R” appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥ Push [NR] to turn the noise reduction ON and
OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Twin PBT (passband tuning) (p. 51)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBT C] to clear the settings.
• AGC (auto gain control) (p. 48)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
•
1
⁄4 function (p. 21)
➥ While M1 is selected with [MENU], push
[F3 1/4] to turn the
1
⁄4 function ON and OFF.
DD
Convenient functions for transmit
• Transmit quality monitor (p. 56)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
•“MONI” appears when the monitor function is set to
ON.
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■ RTTY functions
The transceiver has a number of convenient functions
for the RTTY operation that can be accessed from the
RTTY menu.
q Push [CW/RTTY] to select RTTY mode.
w Push [MENU] to select M1.
e Push [F4 RTY] to select the RTTY menu.
r Push one of the multi-function keys ([F2], [F4] or
[F5]) to select an item in the RTTY menu. See the
diagram below.
• Push [MENU] to return to the previous indication.
DD
IN RTTY MODE
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
1/4
RTY
SCP
DEC
FIL
SET
21251
RTTY
Mark
35O1
Band
Width
ADJ
RTTY-FIL
ON
DEC
FIL
SET
• RTTY menu
• RTTY decoder screen (p. 38)
• RTTY filter set mode (p. 37)
• RTTY set mode (p. 39)
Push [F4]
Push
[F4] for
1 sec.
Switches RTTY filter ON and OFF.
Push
[F4]
Push
[F5]
Push [F2]
[MENU] [CW/RTTY]
DD
About RTTY reverse mode
Received characters are occasionally garbled when
the receive signal is reversed between MARK and
Space. This reversal can be caused by incorrect TNC
connections, setting, commands, etc. To receive re-
versed RTTY signals correctly, select RTTY-R mode.
➥ While RTTY mode is selected, push [CW/RTTY]
for 1 sec. to select the RTTY reverse mode.
•“RTTY-R” appears when the RTTY reverse mode is se-
lected.
•Push [CW/RTTY] for 1 sec. again to select the normal
RTTY mode.
Normal Reverse
170
Hz
170
Hz
2125
Hz
2125
Hz
BFOBFO
Space
Space
Mark
Mark
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DD
RTTY filter/Twin peak filter
The transceiver has 5 RTTY filters in addition to nor-
mal IF filters. The passband width can be selected
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.
When the RTTY filter is turned ON, the RTTY tuning
meter can be used.
Moreover, the twin peak filter changes the receive fre-
quency response by boosting 2 particular frequencies
(2125 and 2295 Hz) for better copying of desired
RTTY signals.
• RTTY filter and twin peak filter setting
q Push [CW/RTTY] to select RTTY mode.
•After RTTY mode is selected, push [CW/RTTY] for 1 sec.
to select RTTY-R mode.
w Push [MENU] several times to select M1.
e Push [F4 RTY] to select RTTY menu.
r Push [F4 FIL] to turn the RTTY filter ON and OFF.
•When the RTTY filter is turned ON, the normal IF filter
number indication (1, 2 or 3) disappears.
t Push [F4 FIL] for 1 sec. to enter RTTY filter set
mode (see below).
y Push [F1≤] to select bandwidth item.
u Rotate the tuning dial to select the RTTY filter width
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.
• Push [F3] for 1 sec. to select a default value.
i Push [F2 ≥] to select twin peak filter item.
•The received audio volume may become greater when
the twin peak filter is turned ON.
o Rotate the tuning dial to turn the twin peak filter
function ON and OFF.
!0 Push [MENU] 2 times to return to M1.
• RTTY filter set mode
37
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F1
F2 F3 F4 F5
F1
F2 F3 F4 F5
AGC
DUP
1/4
RTY
SCP
DEC
FIL
SET
RTTY-FIL
ON
Push [F4]
Disappears when the RTTY
filter is turned OFF.
RTTY filter indicator
Rotate the tuning dial to the
point where both sides of the
dots appear equally.
1. Band Width
This item sets the RTTY filter width.
• 250, 300, 350, 500 Hz and 1 kHz can be selected.
35O1
Band
Width
2. Twin Peak FIL
This item turns the twin peak filter ON and OFF.
ON2
Twin
Peak
FIL
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F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
1/4
RTY
SCP
DEC
FIL
SET
ADJ
RTTY-FIL
ON
Push [F4]
Push [F2]
Appears while the RTTY decoder screen is freezed
with [F2] operation.
Push [F3] to erase the displayed characters.
DD
RTTY decoder
The transceiver has an RTTY decoder for Baudot
(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps).
An external terminal unit (TU) or terminal node con-
nector (TNC) is not necessary for receiving a Baudot
signal.
q Push [CW/RTTY] to select RTTY mode.
•After RTTY mode is selected, push [CW/RTTY] for 1 sec.
to select RTTY-R mode.
w Push [MENU] several times to select M1.
e Push [F4 RTY] to select RTTY menu.
r Push [F4 FIL] to turn the RTTY filter ON.
•The RTTY decoder does not function when the RTTY fil-
ter is turned OFF.
t Push [F2 DEC] to turn the RTTY decoder ON.
• RTTY decoder screen appears.
y Push [F2] to freeze the current screen.
•“H” appears while the function is in use.
u Push [F3] for 1 sec. to clear the displayed charac-
ters.
i Push [MENU] to exit the RTTY decoder screen.
• Setting the decoder threshold level
Adjust the RTTY decoder threshold level if some char-
acters are displayed when no signal is received.
q Call up the RTTY decoder screen as described
above.
w Push [F1 ADJ] to select the threshold level setting
condition.
e Rotate the tuning dial to adjust the RTTY decoder
threshold level.
• Push [F3] for 1 sec. to select the default condition.
r Push [MENU] to exit the RTTY decoder screen.
The number of line of text can be selected from 2 or
3 in the display. The UnShift On Space (USOS)
function and new line code can be set in the RTTY
set mode. (p. 39)
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
ADJ
å
9
Push [F1]
Threshold level indication
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RTTY set mode
This set mode is used to set the mark and shift fre-
quencies, keying type, decode USOS function, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 RTY] to
select the RTTY menu.
w Push [F5 SET] to select RTTY set mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
•Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
F 1
F 2 F 3 F 4 F 5
21251
RTTY
Mark
Set item up/down
1. RTTY Mark
Sets the mark frequency for RTTY operation.
• 1275, 1615 and 2125 Hz are selectable.
21251
RTTY
Mark
2. RTTY Shift
Sets the shift frequency for RTTY operation.
• 170, 200 and 425 Hz are selectable.
17O2
RTTY
Shift
3. RTTY Keying
Selects the keying polarity from normal and reverse.
NORMAL Key open/close = Mark/Space
REVERSE Key open/close = Space/Mark
NORMAL
3
RTTY
Keying
4. Decode USOS
Turn the USOS (UnShift On Space) function ON/OFF
ON Decode as letter code
OFF Decode as character code
ON
4
Decode
USOS
5. Decode New Line
Selects the new line code of the internal RTTY decoder.
CR: Carriage Return; LF: Line Feed
CR,LF,CR+LF CR, LF and CR+LF
CR+LF CR+LF only
CR,LF,CR+LF
5
Decode
New
Line
6. Decode Screen
Selects the number of the decoder indication from 2
or 3 lines.
3line
6
Decode
Screen
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■ Operating AM
q Push a band key to select the desired band.
w Push [AM/FM] to select AM.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
•The default tuning step for AM mode is 1 kHz; this can
be changed using the tuning step program mode. (p. 21)
t Push [TRANSMIT] or [PTT] (microphone) to trans-
mit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
Band keys[TX] indicator[TRANSMIT]
[MIC GAIN] [AM/FM] Tuning dial
Appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥
Push [NR] to turn the noise reduction ON and OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Auto notch filter (p. 52)
➥ Push [A/NOTCH] to turn the auto or manual
notch filter ON and OFF.
•Rotate [NOTCH] control to set the attenuating fre-
quency for manual notch operation.
• IF shift (p. 51)
➥ Rotate [TWIN PBT] controls (inner only).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 48)
➥ While M1 is selected with [MENU], push [F1
AGC] several times to select AGC F, AGC M,
AGC S or AGC OFF.
• VSC (voice squelch control) (p. 53)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
•The VSC indicator appears when the voice squelch
function is set to ON.
DD
Convenient functions for transmit
• Speech compressor (p. 57)
➥ While M1 is selected with [MENU], push [F3
CMP] to turn the speech compressor ON and
OFF.
•“COMP” appears when the speech compressor is set
to ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
•“VOX” appears when the VOX function is set to ON.
• Transmit quality monitor (p. 56)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
•“MONI” appears when the monitor function is set to
ON.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
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■ Operating FM
q Push a band key to select the desired band.
w Push [AM/FM] to select FM.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
t Push [TRANSMIT] or [PTT] (microphone) to trans-
mit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
Band keys[TX] indicator[TRANSMIT]
[MIC GAIN] [AM/FM] Tuning dial
Appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥
Push [NR] to turn the noise reduction ON and OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Auto notch filter (p. 52)
➥ Push [A/NOTCH] to turn the auto or manual
notch filter ON and OFF.
•Rotate [NOTCH] control to set the attenuating fre-
quency for manual notch operation.
• VSC (voice squelch control) (p. 53)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
•The VSC indicator appears when the voice squelch
function is set to ON.
DD
Convenient functions for transmit
• Speech compressor (p. 57)
➥ While M1 is selected with [MENU], push [F3
CMP] to turn the speech compressor ON and
OFF.
•“COMP” appears when the speech compressor is set
to ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
•“VOX” appears when the VOX function is set to ON.
• Transmit quality monitor (p. 56)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
•“MONI” appears when the monitor function is set to
ON.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
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Tone squelch operation
Tone squelch operation is a method of communica-
tions using selective calling. Only received signals hav-
ing a matching tone will open the squelch. Before
communicating using tone squelch, all members of
your party must agree on the tone squelch frequency
to use.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TON] several times to turn the tone
squelch function ON.
•“TSQL” appears
r Push [F4 TONE] for 1 sec. to enter tone frequency
set mode.
t Push [F1 TON] several times until TSQL Tone
appears, if necessary.
y Rotate the tuning dial to select the desired tone
squelch frequency.
• Push [F3] for 1 sec. to select the default frequency.
u Push [MENU] to return to M1.
i Communicate in the usual manner.
• Available tone squelch frequencies (Unit: Hz)
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TON
SCP
TON
SCN
88.5Hz
TSQL
Tone
Push [F4] for 1 sec.
67.0
69.3
71.9
74.4
77.0
79.7
82.5
085.4
088.5
091.5
094.8
097.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
IC-7400.qxd 02.4.2 11:35 Page 42
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4
RECEIVE AND TRANSMIT
2001 NEW 2001 NEW
DD
DTCS operation
DTCS function is an another method of communica-
tions using selective calling. Only received signals hav-
ing a matching 3-digit code will open the squelch.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TON] several times to turn the DTCS
function ON.
•“DTCS” appears
r Push [F4 TON] for 1 sec. to enter tone frequency
set mode.
t Push [F1 TON] several times until DTCS Code
appears, if necessary.
y Rotate the tuning dial to select the desired DTCS
code number and push [F5] to select the desired
code polarity.
NN : Normal polarity is used for both transmit and
receive.
NR : Normal polarity is used for transmit, reversed
polarity is used for receive.
RN : Reversed polarity is used for transmit, normal
polarity is used for receive.
RR : Reversed polarity is used for both transmit
and receive.
•Push [F3] for 1 sec. to select the default code and polar-
ity.
u Push [MENU] to return to M1.
i Communicate in the usual manner.
• Available tone codes
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TON
SCP
TON
SCN
O23-NN
DTCS
Code
Push [F4] for 1 sec.
Push [F5] to select the polarity
Select a code with the tuning dial.
023
025
026
031
032
036
043
047
051
053
054
065
071
072
073
074
114
115
116
122
125
131
132
134
143
145
152
155
156
162
165
172
174
205
212
223
225
226
243
244
245
246
251
252
255
261
263
265
266
271
274
306
311
315
325
331
332
343
346
351
356
364
365
371
411
412
413
423
431
432
445
446
452
454
455
462
464
465
466
503
506
516
523
526
532
546
565
606
612
624
627
631
632
654
662
664
703
712
723
731
732
734
743
754
IC-7400.qxd 02.4.2 11:35 Page 43
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4
RECEIVE AND TRANSMIT
2001 NEW
■ Repeater operation
A repeater amplifies received signals and retransmits
them at a different frequency. When using a repeater,
the transmit frequency is shifted from the receive fre-
quency by an offset frequency. A repeater can be ac-
cessed using split frequency operation with the shift
frequency set to the repeater’s offset frequency.
q Push a band key to select the desired band.
w Push [A/B] to select VFO A.
e Push [AM/FM] to select FM.
• Pushing [AM/FM] toggles between AM and FM.
r Rotate the tuning dial to set the repeater transmit
frequency.
t While M1 is selected, push [F2 DUP] several times
to set the offset direction.
•“DUP–” or “DUP+” appears
•0.100 MHz for HF, 0.500 MHz for 50 MHz and
0.600 MHz for 144 MHz band is set by default in set
mode. (p. 83)
y Push [F4 TON] to turn the repeater tone ON.
•“T” appears.
•Set the tone frequency in tone frequency set mode in
advance, if desired. (p. 45) 88.5 Hz is set by default.
To transmit a 1750 Hz European repeater tone,
push [F4 TON] while transmitting.
u Communicate in the normal way.
DD
One-touch repeater function
This function allows you to set repeater operation with
push of one switch.
➥ To set the transceiver for repeater operation using
the one-touch repeater function, follow the steps q
to r as above, then push [F2 DUP] for 1 sec.
Set the offset shift direction and frequency in ad-
vance (p. 82) as well as the tone frequency (see
p. 45).
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TON
SCP
AGC
DUP
CMP
TON
SCP
145.O8OOO
Push [F2], [F4]
Appears
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TON
SCP
AGC
DUP
CMP
TON
SCP
145.O8OOO
Push [F2] for 1 sec.
Appears
IC-7400.qxd 02.4.2 11:35 Page 44
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4
RECEIVE AND TRANSMIT
2001 NEW
DD
Transmit frequency monitor check
You may be able to receive the other party’s transmit
signal directly without having to go through a repeater.
This function allows you to check this.
➥ While receiving, push and hold [XFC] to see if you
can receive the other party’s transmit signal directly.
•While holding [XFC], the offset direction and frequency
are displayed on the multi-function switch indicator.
DD
Repeater tone frequencies
The transceiver’s repeater tone frequency is set to
88.5 Hz by default. This can be changed if desired.
q While M1 is selected, push [F4 TON] to turn the
tone encoder ON.
•“T” appears.
w Push [F4 TON] for 1 sec. to select the tone fre-
quency set mode.
e Push [F1 TON] several times to select Rptr
Tone, if necessary.
r Rotate the tuning dial to select the desired fre-
quency. (see the table at right)
t Push [MENU] to return to M1.
DD
Storing a non standard repeater
q Turn the auto repeater function OFF in the set
mode. (p. 83)
w Push [AM/FM] to select FM mode.
e Push [V/M], then [A/B] to select VFO A.
r Rotate the tuning dial to set the repeater output fre-
quency.
• Set the tuning step if desired.
t Push [A/B] to select VFO B.
y Rotate the tuning dial to set the repeater input fre-
quency.
u Push [A/B] to select VFO A.
i Push [SPLIT] to turn the split function ON.
o Push [F4 TON] to turn the previously set tone en-
coder ON.
!0 Rotate [M-CH] to select the desired memory chan-
nel.
•“BLANK” appears when a blank channel is selected.
!1 Push [MW] for 1 sec. to store the contents in the se-
lected memory channel.
AGC
DUP
CMP
TON
SCP
-6OO.Ok
[XFC]
[AM/FM] [SPLIT] [A/B] [M-CH]
[MW]
[V/M]
67.0
69.3
71.9
74.4
77.0
79.7
82.5
085.4
088.5
091.5
094.8
097.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
TON
SCN
88.5Hz
Rptr
Tone
• Available tone frequencies (Unit: Hz)
IC-7400.qxd 02.4.2 11:35 Page 45
5
46
FUNCTIONS FOR RECEIVE
2001 NEW
■ Simple band scope
The band scope function allows you to visually check
signal conditions around a specified frequency. The IC-
7400’s band scope function can be used in any oper-
ating mode and frequency band.
The band scope measures receive signal conditions
over a specified range on either side of a selected fre-
quency in either VFO or memory modes.
q Rotate the tuning dial to tune a frequency.
w While M1 is selected, push [F5 SCP] to select the
band scope menu.
•Starts sweeping automatically with the previously se-
lected sweeping step.
• During sweep, received signals cannot be heard.
e Push [F5 STEP] several times to select the desired
sweep step.
r Push [F1] to start sweeping, then stop automatically
after sweeping.
•Push [F1] for 1 sec. to start continuous sweeping. In this
case, it is necessary to push [F1] to stop sweeping.
•During sweep operation “” appears and received
signals cannot be heard.
•If there is a lot of signal noise, turn the preamp OFF and
the attenuator ON to reduce the signal input level and
improve the readability of the band scope.
t When rotating the tuning dial and you finding a sig-
nal you wish to communicate on, then just commu-
nicate in the normal way.
•If you want to return to the previous frequency (before
rotating the tuning dial), push [F3] for 1 sec.
•If the selected frequency is set outside of the sweeped
range, flashes.
y While receiving, if you want to update the band con-
ditions, repeat steps e and r as above.
“ ” or “ ”
0.5k
STEP
Sweep indicator
Band scope indicator
Frequency indicator mark
Sweep step indicator
INDICATOR
Sweep
Band scope in-
dicator
Frequency
indicator mark
Sweep step
DESCRIPTION
While the band scope is “sweeping,” “” appears; while stopped “” appears. Received
audio is not emitted from the speaker while the band scope is “sweeping.”
Indicates the relative strength of signals and their location in relation to the center (displayed)
frequency. Signal strength is relative to the S-meter level, S1 to S9, with each vertical dot in the
band scope indicator equal to one segment of the S-meter. Signal activity is measured ±30
steps from the center frequency with each step equal to the selected sweep step.
After a sweep, indicates the relative position of the selected frequency. When the selected fre-
quency is outside of the sweep range, indicator flashes. After changing the fre-
quency, push [F3] for 1 sec. to automatically return to the center frequency.
Indicates the selected sweep step. 0.5, 1, 2, 5, 10, 20 and 25 kHz are selectable. Each dot of
the band scope indication is approx. equal to the selected sweep step.
“ ” or “ ”
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
Sweep step selectionSweep start/stop
O.5k
STEP
O.5k
STEP
Sweep indicator
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5
FUNCTIONS FOR RECEIVE
2001 NEW 2001 NEW
■ Preamp/Attenuator
The preamp amplifies received signals in the front end
circuit to improve the S/N ratio and sensitivity. Set this
to preamp 1 or preamp 2 when receiving weak signals.
The attenuator prevents a desired signal from distor-
tion when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from broadcasting stations, are near your location.
These can both set independently for each band.
➥ Push [P.AMP/ATT] several times to set the preamp
OFF, preamp 1 ON or preamp 2 ON.
•When the preamp is ON, either “P.AMP 1” or
“P.AMP 2” appears in the function display.
•When operating on the 144 MHz band, the preamp can
only be set to ON or OFF only— there is no preamp 1
and preamp 2.
➥
Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.
•
“ATT” appears in the display when the function is set ON.
•Push [P.AMP/ATT] momentarily to set the attenuator OFF.
■ RIT function
The RIT (Receive Increment Tuning) function compen-
sates for off-frequencies of the communicating station.
The function shifts the receive frequency up to
±9.99 kHz in 10 Hz steps without moving the transmit
frequency.
• See #0 on p. 4 for function description.
q Push [RIT] to turn the RIT function ON and OFF.
•“RIT” and the shifting frequency appear when the func-
tion is ON.
w Rotate the [RIT/∂TX] control.
•Push [CLEAR] for 1 sec. to reset the RIT frequency.
•Push [CLEAR] momentarily to reset the RIT frequency
when the quick RIT clear function is ON. (p. 86)
•Push [RIT] for 1 sec. to add the shift frequency to the op-
erating frequency.
DD
RIT monitor function
When the RIT function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency
directly (RIT is temporarily cancelled).
[P.AMP/ATT]
Push
P.AMP/ATT
Push
P.AMP/ATT
Push
P.AMP/ATT
Push for 1sec.
P.AMP/ATT
Push
P.AMP/ATT
Regular preamp, the most effective for 1.8 to
21 MHz bands without IMD corruption.
High-gain preamp, the most effective for 24
to 50 MHz bands.
Preamp activates for the VHF band
(144 to
146 MHz range; 108 to 174 for the USA version)
.
[RIT]
[CLEAR]
[RIT/∂TX] control
Appears
Regarding the use of the “P.AMP 2”
The “P.AMP 2” is a high gain receive amplifier. When the
“P.AMP 2” is used during times of strong electric fields, dis-
tortion sometimes results. In such cases, use the trans-
ceiver with the “P.AMP 1” or “P.AMP OFF” setting.
The “P.AMP 2” is most effective when:
•Used on bands above 24 MHz and when electric fields are
weak.
•Receive sensitivity is insufficient during low gain, or while
using a narrow band antenna
(such as small loop, a Bever-
age antenna or a short Yagi antenna, etc.) is used.
IC-7400.qxd 02.4.2 11:35 Page 47
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5
FUNCTIONS FOR RECEIVE
2001 NEW
■ AGC function
The AGC (auto gain control) controls receiver gain to
produce a constant audio output level even when the
received signal strength is varied by fading, etc.
The transceiver has 3 AGC characteristics (time con-
stant; fast, mid, slow) for non-FM modes.
The FM mode AGC time constant is fixed as ‘FAST’
(0.1 sec.) and AGC time constant cannot be se-
lected.
DD
AGC speed selection
q Select a non-FM mode.
w While M1 is selected, push [F1 AGC] several times
to select AGC F, AGC M, AGC S or AGC OFF.
“AGC OFF” appears when AGC time constant OFF
is set with one of FAST, MID or SLOW setting in
AGC set mode.
DD
Setting the AGC time constant
q Select the desired mode other than FM mode.
w While M1 is selected, push [F1 AGC] for 1 sec. to
enter AGC set mode.
e Push one of [F2
FAST
], [F3
MID
] or [F4
SLOW
] to se-
lect the desired AGC speed to be set.
•An underline appears below the time constant indication.
r Rotate the tuning dial to set the desired time con-
stant.
•AGC time constant can be set between 0.1 to 8.0 sec.
(depends on mode) or turned OFF.
•Push [F2
FAST
], [F3
MID
] or [F4
SLOW
] for 1 sec. to se-
lect a default value each for fast, mid. and slow, respec-
tively.
t Select another mode other than FM. Repeat steps
e and r if desired.
y Push [MENU] to exit the AGC set mode.
• Selectable AGC time constant (unit: sec.)
Mode Default Selectable AGC time constant
0.3 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
SSB 2.0 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
6.0 (SLOW)
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
CW 0.5 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
RTTY 0.5 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
3.0 (FAST)
OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5
AM 5.0 (MID)
3.0, 4.0, 5.0, 6.0, 7.0, 8.0
7.0 (SLOW)
FM 0.1 (FAST) Fixed
[F1 AGC] Mode switches
: Medium AGC speed
: Slow AGC speed
: Fast AGC speed
: AGC is not activated
F 1
F
2F
3
F
4
F
5
F 1
F
2 F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TBW
SCP
Push [F1] for 1 sec.
Selected modeAppears under the selected AGC
speed’s time constant indication.
Push [F2] for 1 sec. to select the default value in
this case.
• When AGC fast is selected
IC-7400.qxd 02.4.2 11:35 Page 48
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5
FUNCTIONS FOR RECEIVE
2001 NEW 2001 NEW
■ IF filter selection
The transceiver has 3 passband width IF filters for
each mode.
For SSB and CW modes, the passband width can be
set within 50 to 3600 Hz in 50 or 100 Hz steps. A total
of 41 passband widths are available.
For RTTY mode, the passband width can be set within
50 to 2700 Hz in 50 or 100 Hz steps. A total of 32
passband widths are available.
For AM and FM modes, the passband width is fixed
and 3 passband widths are available independently.
The filter selection is automatically memorized in
each mode.
The PBT shift frequencies are automatically memo-
rized in each filter.
DD
IF filter selection
q Select the desired mode.
w For RTTY mode, turn OFF the RTTY filter.
e Push [FILTER] several times to select the IF filter
1, 2 or 3.
•The selected passband width and filter number is dis-
played in the LCD.
By pushing [PBTC], the set filter passband width,
“B,” and shifting value “S” is indicated.
DD
Filter passband width setting (SSB, CW and RTTY mode only)
q Select SSB, CW or RTTY mode.
•Passband widths for AM and FM modes are fixed and
cannot be set.
w For RTTY mode, turn OFF the RTTY filter.
e Push [FILTER] for 1 sec. to enter filter set mode.
r Push [FILTER] several times to select the desired
IF filter number.
t While pushing [F1 BW], rotate the tuning dial to set
the desired passband width.
•In SSB and CW modes, the passband width can be set
within the following range.
50 to 500 Hz 50 Hz steps
600 to 3600 Hz 100 Hz steps
•In RTTY mode, the passband width can be set within the
following range.
50 to 500 Hz 50 Hz steps
600 to 2700 Hz 100 Hz steps
• Push [F-3] for 1 sec. to select the default value.
y Repeat steps r to t if desired.
u Push [MENU] to exit the filter set mode.
The PBT shift frequencies are cleared when the
passband width is changed.
This filter set mode screen graphically displays the
PBT shift frequencies and CW pitch operations.
AGC
DUP
CMP
TBW
SCP
[FILTER]
The selected filter width is indicated
for approx. 1 sec. when [FILTER] is
pushed.
Filter selection
BW
• Filter set mode indication
Shows the selected filter and passband width.
BW
• Indication while setting
While pushing [F1 BW], rotate the tuning dial to set
passband width.
Reverses Appears
IC-7400.qxd 02.4.2 11:35 Page 49
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5
FUNCTIONS FOR RECEIVE
2001 NEW
[NB]
NB
Level
5O%
Shows noise blanker level
“NB” appears while noise blanker is activated.
■ IF (DSP) filter shape
The type of IF (DSP) filter shape for SSB and CW can
be selected independently from soft and sharp.
q Push [SSB] or [CW/RTTY] to select SSB, CW or
RTTY mode.
w Select the filter set mode.
• Push [FILTER] for 1 sec.
• Operating mode can be selected in this step.
e Push [FILTER] several times to select the desired
IF filter.
r Push the [F5] to select the filter shape from “
SOFT
”
and “
SHARP
.”
t Push [MENU] to exit the set mode.
■ Noise blanker
The noise blanker eliminates pulse-type noise such as
from car ignitions. The noise blanker is not available
for FM mode.
q Push [NB] to turn the noise blanker ON.
• [NB] indicator appears.
w Push [NB] for 1 sec. to enter the NB level set mode.
e Rotate the tuning dial to adjust the noise blanker
level.
•Noise blanker level is indicated with bar meter and digit
in ‘%.’
r Push [NB] to exit the noise blanker set mode.
t Push [NB] to turn the noise blanker OFF.
• [NB] indicator disappears.
When using the noise blanker, received signals may
be distorted if the noise blanker level setting has
been too high.
■ Meter peak hold function
The S-meter has a peak level holding function. The
peak level of the received signal strength is indicated
for 0.5 sec. (approx.). This function can be deactivated
in set mode if desired. (p. 81)
BW
BW
Push [F5]
Meter
Peak
Hold
9
ON
Shows peak level for approx. 0.5 sec.
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5
FUNCTIONS FOR RECEIVE
2001 NEW 2001 NEW
■ Twin PBT operation
General PBT (Passband Tuning) function electronically
narrows the IF passband width by shifting the IF fre-
quency to slightly outside of the IF filter passband to
reject interference. This transceiver uses the DSP cir-
cuit for the PBT function. Moving both [TWIN PBT]
controls to the same position shifts the IF.
➥ The LCD shows the passband width and shift fre-
quency graphically.
➥ Push [FILTER] for 1 sec. to enter the filter set mode.
Current passband width and shift frequency is dis-
played in the filter set mode screen.
➥ To set the [TWIN PBT] controls to the center posi-
tions, push [PBTC] for 1 sec.
The variable range depends on the passband width
and mode. The edge of the variable range is half of the
passband width, and PBT is adjustable in 25 or 50 Hz
steps. These controls function as an IF shift control
while in AM mode and when the RTTY filter is turned
ON. Only the inner control may function in this case.
IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY
filter is turned ON) or 150/300/500 Hz steps in AM.
•
[TWIN PBT] should normally be set to the center positions
(PBT setting is cleared) when there is no interference.
NOTE: In the “center” PBT position on CW, it is normal
for the graphic display’s center line to be slightly to the
left side of PBT envelope, if a CW filter selection of
800 Hz or above is selected.
•When PBT is used, the audio tone may be changed.
• Not available for FM mode.
•For AM and RTTY (with RTTY filter ON) modes,
[TWIN PBT] inner control only can be activated, and
functions as an IF shift function.
•While rotating [TWIN PBT], noise may occur. This comes
from the DSP unit and does not indicate an equipment
malfunction.
•
By pushing [PBTC] momentarily indicates the passband
width, “B,” and shifting value, “S” of the filter being used.
PBT OPERATION EXAMPLE
interference
inteference
interference
desired signal
desired signal
pass band
IF center frequency
Center
Passband
Passband
IF center freq.
IF shift
AGC
DUP
CMP
TBW
SCP
Passband width and shifting value are
indicated while [TWIN PBT] is operated.
[TWIN PBT] control
[PBTC]
Appears when PBT is used.
BW
• Filter set mode indication
Shows the selected filter and passband width.
BW
• Indication while PBT setting
Appears when passband is shifted.
*By pushing [PBTC] for 1 sec., the shifted value returns
to the default setting, and the “dot” disappears.
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FUNCTIONS FOR RECEIVE
2001 NEW
■ Noise reduction
The noise reduction function reduces noise compo-
nents and picks out desired signals which are buried
in noise. The received signals are converted to digital
signals and then the desired signals are separated
from the noise.
q Push the [NR] switch to turn the noise reduction
ON.
•“NR” appears.
w Rotate the [NR] control to adjust the noise reduction
level.
e Push the [NR] switch to turn the noise reduction
OFF.
•“NR” disappears.
Deep rotation of the [NR] control results in audio sig-
nal masking or distortion. Set the [NR] control for
maximum readability.
■ Notch function
This transceiver has auto and manual notch functions.
The auto notch function automatically attenuates more
than 3 beat tones, tuning signals, etc., even if they are
moving. The manual notch can be set to attenuate a
frequency via the [NOTCH] control.
➥ Push [A/NOTCH] to toggle the notch function be-
tween auto, manual and OFF in SSB and AM
modes.
➥ Push [A/NOTCH] to turn the manual notch function
ON and OFF in CW mode.
➥ Push [A/NOTCH] to turn the auto notch function ON
and OFF in FM mode.
•Set to attenuate a frequency for manual notch via the
[NOTCH] control.
•“ANOTCH” appears when auto notch is in use.
•“NOTCH” appears when manual notch is in use.
While operating the manual notch, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
■ Dial lock function
The dial lock function prevents accidental changes
caused by the tuning dial.
➥ Push [LOCK/SPCH] to turn the dial lock function ON
and OFF.
•“LOCK” indicator lights while the dial lock function is ac-
tivated.
AGC
DUP
CMP
TBW
SCP
[A/NOTCH] [NOTCH]
Notch function indicators
AGC
DUP
CMP
TBW
SCP
[NR] [NR]
Appears
[LOCK/SPCH]
Lights while the dial lock function is activated.
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FUNCTIONS FOR RECEIVE
2001 NEW
■ Voice squelch control function
This function is useful when you don’t want unmodu-
lated signals. When the voice squelch control function
is activated, the receiver checks received signals for
voice components.
If a receiver signal includes voice components, and the
tone of the voice components changes within 1 sec.,
squelch opens. If the received signal includes no voice
components or the tone of the voice components does
not change within 1 sec., squelch closes.
➥ While M2 is selected with [MENU], push [F5 VSC]
to switch the VSC (Voice Squelch Control) function
ON and OFF.
•“VSC” appears when the function is activated.
•The VSC function activates for phone modes
(SSB, AM and FM).
•The VSC function can also be used for scanning
operation in AM or FM mode (p. 69).
F 1
F 2 F 3 F 4 F 5
SCN
MEM
SWR
TCN
VSC
Push [F5] to turn the VSC function ON and OFF.
VSC indicator
IC-7400.qxd 02.4.2 11:35 Page 53
6
54
FUNCTIONS FOR TRANSMIT
2001 NEW
■ VOX function
The VOX (Voice-Operated Transmission) function
switches between transmit and receive with your voice.
This function provides an opportunity to input log en-
tries into your computer, etc., while operating.
• Using the VOX function
q Select a phone mode (SSB, AM, FM).
w Push [VOX/BK-IN] to turn the VOX function ON or
OFF.
DD
Adjusting the VOX function
q Select a phone mode (SSB, AM, FM).
w Push [VOX/BK-IN] to turn VOX function ON.
e Push [VOX/BK-IN] for 1 sec. to enter VOX set
mode.
r Select the VOX Gain item using [F1 ≤] or [F2 ≥].
t While speaking into the microphone, rotate the tun-
ing dial to the point where the transceiver is contin-
uously transmitting.
- Push [F3] for 1 sec. to select the default value.
y Push [F2 ≥] to select Anti-VOX item.
u While receiving, rotate the tuning dial to the point
where the transceiver does not switch to transmit
with the speaker output.
- Push [F3] for 1 sec. to select the default value.
i Push [F2 ≥] to select VOX Delay item.
o Adjust the VOX delay for a convenient interval be-
fore returning to receive.
- Select the VOX delay item using the tuning dial.
- Push [F3] to select the default value.
!0 Push [MENU] to return to previous indication.
AGC
DUP
CMP
TBW
SCP
[VOX/BK-IN]
Appears
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
VOX
Gain
5O%
Shows VOX gain level
1
Anti-VOX
5O%
Shows anti-VOX gain level
2
VOX
Delay
O.2s
Shows VOX delay time
3
IC-7400.qxd 02.4.2 11:35 Page 54
55
6
FUNCTIONS FOR TRANSMIT
2001 NEW 2001 NEW
■ Break-in function
The break-in function is used in CW mode to automat-
ically toggle the transceiver between transmit and re-
ceive when keying. The IC-7400 is capable for full
break-in or semi break-in.
DD
Semi break-in operation
During semi break-in operation, the transceiver selects
transmit when keying, then automatically returns to re-
ceive after a pre-set time from when you stop keying.
q Push [CW/RTTY] to select CW or CW-R mode.
w Push [VOX/BK-IN] several times to turn the semi
break-in function ON.
•“BK-IN” appears.
e Set the break-in delay time (the delay from transmit
to receive).
➥ Push [VOX/BK-IN] for 1 sec. to select break-in
delay program mode.
➥ Rotate the tuning dial to select the desired delay.
• Push [F3] for 1 sec. to select to the default value.
r Push [MENU] to return to the previous menu.
When using a paddle, rotate [KEY SPEED] to adjust
the keying speed.
DD
Full break-in operation
During full break-in operation, the transceiver automati-
cally selects transmit while keying and returns to receive
immediately after keying is finished.
q Push [CW/RTTY] to select CW or CW-R mode.
w Push [VOX/BK-IN] several times to turn the full
break-in function ON.
•“FBK-IN” appears.
When using a paddle, rotate [KEY SPEED] to adjust
the keying speed.
[VOX/BK-IN]
Break-IN
Delay
Break-in indicator
Shows break-in delay time
7.5d
AGC
DUP
1/4
KEY
SCP
Full break-in indicator
IC-7400.qxd 02.4.2 11:35 Page 55
56
6
FUNCTIONS FOR TRANSMIT
2001 NEW
■
∂∂
TX function
The ∂TX function shifts the transmit frequency up to
±9.99 kHz in 10 Hz steps without moving the receive
frequency.
• See #2 on p. 4 for function description.
q Push the [∂TX] switch to turn the ∂TX function ON
and OFF.
•“∂TX” and shift frequency appear when the function is
ON.
w Rotate the [RIT/∂TX] control.
• To reset the ∂TX frequency, push [CLEAR] for 1 sec.
•Push [CLEAR] momentarily to reset the ∂TX frequency
when the quick RIT clear function is ON. (p. 85)
•To add or subtract the ∂TX frequency to the displayed
frequency, push [∂TX] for 1 sec.
When RIT and ∂TX are ON at the same time, the
[RIT/∂TX] control shifts both the transmit and re-
ceive frequencies from the displayed frequency at
the same time.
DD ∂∂
TX monitor function
When the ∂TX function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency di-
rectly (∂TX is temporarily cancelled).
■ Monitor function
The monitor function allows you to monitor your trans-
mit IF signals in any mode through the speaker. Use
this to check voice characteristics while adjusting SSB
transmit tones. (p. 88) The CW sidetone functions re-
gardless of the [MONITOR] switch setting.
q Push [MONITOR] to switch the monitor function ON
and OFF.
•“MONI” appears when the monitor function is ON.
w Set the monitor level.
➥ Push [MONITOR] for 1 sec. to select monitor pro-
gram mode.
➥ Rotate the tuning dial for the clearest audio out-
put while pushing [PTT] and speaking into the mi-
crophone.
• Push [F3] for 1 sec. to select the default value.
e Push [MENU] to return to the previous menu.
[∂TX]
[CLEAR]
[RIT/∂TX] control
Appears
[MONITOR]
MONITOR
Level
Monitor indicator
Shows monitor level
5O%
IC-7400.qxd 02.4.2 11:35 Page 56
57
6
FUNCTIONS FOR TRANSMIT
2001 NEW 2001 NEW
■ Speech compressor
The speech compressor increases average RF output
power, improving signal strength and readability in
SSB, AM or FM.
When adjusting the compression level, it is necessary
to turn the COMP meter ON in the set mode, in ad-
vance (p. 81).
• In SSB mode
q Select USB or LSB mode and adjust [MIC GAIN] to
a suitable level.
w While M1 is selected, push [F3 CMP] to turn the
speech compressor ON.
•“COMP” appears.
e Push [F3 CMP] for 1 sec. to select compression
level set mode.
r While speaking into the microphone, rotate the tun-
ing dial, so that the COMP meter reads within the
COMP zone with your normal voice level.
• Push [F3] for 1 sec. to select the default value.
When the COMP meter peaks above the COMP
zone, your transmitted voice may be distorted.
t Push [MENU] to return to M1.
• In AM/FM mode
q While M1 is selected, push [F3 CMP] to turn the
speech compressor ON.
•“COMP” appears.
w Push [F3 CMP] for 1 sec. and set the compression
level as “1” in advance.
e While speaking into the microphone, rotate [MIC
GAIN], so that the COMP meter does not exceed
the center dot whether you speak softly or loudly.
r While speaking into the microphone, rotate the tun-
ing dial, so that the COMP meter reads within the
COMP zone with your normal voice level.
• Push [F3] for 1 sec. to select the default value.
When the COMP meter peaks above the COMP
zone, your transmitted voice may be distorted.
t Push [MENU] to return to M1.
■
Transmit filter width selection
(SSB mode only)
The transmit filter width for SSB mode can be selected
from wide, middle and narrow.
q Select USB or LSB mode.
w Push [MENU] to select M1, if necessary.
e Push [F4 TBW] for 1 sec. to select the transmission
passband width.
•One of “TX BW=WIDE,” “TX BW=MID” or “TX
BW=NAR” is displayed for approx. 1 sec.
• Transmit filter width: NAR 2.2 kHz
MID 2.4 kHz
WIDE 2.8 kHz
COMP
Level
COMP
Level
5
1
Compressor indicator
Shows compression level
COMP level zone
*The SWR meter functions as the COMP meter
when COMP meter is set to ON in the set mode.
COMP meter
ALC meter
Adjust the COMP Level with the tuning dial so
that the COMP meter does not exceed the COMP
level zone.
Adjust [MIC GAIN], so that the COMP meter does
not exceed this zone.
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TBW
SCP
AGC
DUP
CMP
TBW
SCP
TX
BW=WIDE
Push [F4]
Push [F4] for 1 sec. to select the transmit filter width.
The selected transmit filter width
is displayed for approx. 1 sec.
IC-7400.qxd 02.4.2 11:35 Page 57
58
6
FUNCTIONS FOR TRANSMIT
2001 NEW
■ Split frequency operation
Split frequency operation allows you to transmit and
receive in the same mode on two different frequencies.
The split frequency operation is basically performed
using 2 frequencies in VFO A and VFO B.
The following is an example of setting 21.290 MHz for
receiving and 21.310 MHz for transmitting.
q Set 21.290 MHz (USB) in VFO A.
w Push [SPLIT] to turn the split function ON, then
push [A/B] for 1 sec.
•The equalized transmit (VFO B) frequency and “SPLIT”
appear on the LCD, and the [SPLIT] indicator lights.
e While pushing [XFC] rotate the tuning dial to set the
transmit frequency to 21.310 MHz.
•The transmit frequency can be monitored while pushing
[XFC].
r Now you can receive on 21.290 MHz and transmit
on 21.310 MHz.
To change the transmit and receive frequencies, push
[A/B] to exchange the VFO A and VFO B.
Tuning dial[XFC]
[SPLIT] Lights during split operation
[A/B]
AppearsShows transmit (VFO B) frequency
AGC
DUP
CMP
TBW
SCP
21.29OOO
Shows transmit (VFO B) frequency
Shows shift frequency and direction
AGC
DUP
CMP
TBW
SCP
+2O.OOk
• While pushing [XFC]
AGC
DUP
CMP
TBW
SCP
21.31OOO
• After setting up
CONVENIENT
• Direct shift frequency input
The shift frequency can be entered directly.
q Push [F-INP].
w Enter the desired shift frequency with the digit
keys.
• 1 kHz to 1 MHz can be set.
•When you require a minus shift direction, push
[GENE • ] in advance.
e Push [SPLIT].
•The shift frequency is input in the sub readout and the
split function is turned ON.
[Example]
To transmit on 1 kHz higher frequency:
- Push [F-INP], [1.8
1
] then [SPLIT].
To transmit on 3 kHz lower frequency:
- Push [F-INP], [GENE • ], [7
3
] then [SPLIT].
• Split lock function
Accidentally releasing the [XFC] switch while rotating
the tuning dial changes the receive frequency. To pre-
vent this, use both the split lock and dial lock func-
tions to change the transmit frequency only. The split
lock function cancels the dial lock function while
pushing [XFC] during split frequency operation.
The dial lock’s effectiveness during split frequency
operation can be selected in the set mode for both
receive and transmit frequencies; or only the receive
frequency. (p. 82)
IC-7400.qxd 02.4.2 11:35 Page 58
59
6
FUNCTIONS FOR TRANSMIT
2001 NEW 2001 NEW
■ Quick split function
When you push the [SPLIT] switch for 1 sec., split fre-
quency operation is turned ON, the undisplayed VFO
is automatically changed according to the plus/minus
shift frequency programmed in set mode (p. 83) or
equalized when 0 kHz (default value) is programmed
as the split shift frequency. Quick split operation is
turned ON by default but can be turned OFF in set
mode (p. 82).
q Suppose you are operating at 21.290 MHz (USB) in
VFO A.
w Push [SPLIT] for 1 sec.
• Split frequency operation is turned ON.
•The VFO and VFO B are equalized.
e While pushing [XFC], rotate the tuning dial to set
the frequency offset between transmit and receive.
•When [XFC] is released, the receive frequency is indi-
cated.
DD
Split offset frequency setting
By setting an often-used split frequency offset in ad-
vance, you can use the quick split function to select split
operation at the push of one switch.
Set the split offset frequency in advance in set mode
(p. 82, item 12). The example at right shows the split
offset is set to +0.020 MHz.
➥ Push [SPLIT] for 1 sec. to activate the quick split
function.
•The transmit frequency is offset from the receive fre-
quency according to the offset in set mode.
DD
Split lock function
The split lock function is convenient for changing only
the transmit frequency. When the split lock function is
not used, accidentally releasing [XFC] while rotating the
tuning dial, changes the receive frequency. The split
lock function is ON by default, but can be turned OFF
in set mode.
q While split frequency operation is ON, push
[LOCK/SPCH] to activate the split lock function.
w While pushing [XFC], rotate the tuning dial to
change the transmit frequency.
•If you accidentally release [XFC] while rotating the tuning
dial, the receive frequency does NOT change.
Shows shift frequency and direction
AGC
DUP
CMP
TBW
SCP
+2O.OOk
• Setting the frequency while pushing [XFC]
AGC
DUP
CMP
TBW
SCP
21.31OOO
12
+O.O2OMHz
SPLIT
Offset
Shows transmit frequency for split operation
13
OFF
SPLIT
LOCK
[XFC] Tuning dial [LOCK/SPCH]
IC-7400.qxd 02.4.2 11:35 Page 59
60
6
FUNCTIONS FOR TRANSMIT
2001 NEW
■ Measuring SWR
The IC-7400 has a built-in circuit for measuring an-
tenna SWR— no external equipment or special adjust-
ments are necessary.
The IC-7400 can measure SWR in 2 ways— spot
measurement and plot measurement are available.
DD
Spot measurement
q Push [TUNER] to turn the antenna tuner OFF.
w Turn the COMP meter OFF.
➥ Push [MENU] for 1 sec. to enter set mode.
➥ Push [F1 ≤] or [F2 ≥] several times to select the
COMP Meter item.
➥
Rotate the tuning dial to set the COMP meter OFF.
➥ Push [MENU] to exit set mode.
e Push [CW/RTTY] several times to select RTTY
mode.
r Push [TRANSMIT] or [PTT] on the microphone.
t Rotate [RF PWR] clockwise past the 12 o’clock po-
sition for more than 30 W output power (30%).
y Read the SWR on the SWR meter.
u Push [TRANSMIT] or release [PTT] to receive.
The built-in antenna tuner matches the transmitter
to the antenna when the SWR is lower than 3:1.
DD
Plot measurement
Plot measurement allows you to measure the SWR
over an entire band.
q While M2 is selected with [MENU], push [F3 SWR].
• SWR graph screen appears.
w Rotate [RF PWR] clockwise past the 12 o’clock po-
sition for more than 30 W output power (30%).
e Set the center frequency for the SWR to be mea-
sured.
r Push [F5] for 1 sec. several times to select the de-
sired measuring step from 10, 50, 100 and 500 kHz.
t Push [F3] several times to select the desired num-
ber of measuring steps from 3, 5, 7, 9, 11 and 13
steps.
y Push [F1] to start the measuring.
u Push [TRANSMIT] or push and hold [PTT] on the
microphone to measure the SWR.
• Frequency marker, “∫,” appears below SWR graph.
• RTTY mode is automatically selected.
i When pushing [TRANSMIT] again or releasing
[PTT], the frequency marker and frequency indica-
tion move to the next frequency to be measured.
o Repeat steps u and i to measure SWR over the
entire frequency range.
!0 When the measured SWR is less than 1.5:1, the
antenna is well matched with the transceiver in the
measured frequency range.
AGC
DUP
1/4
RTY
SCP
The best match is in this range.
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
SCN
MEM
SWR
TCN
VSC
1Ok
STEP
1Ok
STEP
Push [F3]
Push [F5] to select
SWR measuring step.
Push [F3] to select number of SWR measuring steps.
Push [F1] to start
measuring.
• Measuring (after pushing [F1])
Frequency marker appears and moves after meas-
urement.
*When mesurement point/s is/are set outside of the oper-
atable frequency band, the frequency marker flashes.
Typical display SWR varying between 1 and 2,
full scale up to SWR 4.0:1.
— 1.0:1
— 1.5:1
— 2.0:1
— 3.0:1
— 4.0:1
IC-7400.qxd 02.4.2 11:35 Page 60
7
61
MEMORY OPERATION
2001 NEW
■ Memory channels
The transceiver has 101 memory channels (plus 1 call
channel). The memory mode is very useful for quickly
changing to often-used frequencies.
All 101 memory channels are tuneable which means
the programmed frequency can be tuned temporarily
with the tuning dial, etc. in memory mode.
■ Memory channel selection
DD
In VFO mode
q Push [V/M] to select VFO mode, if necessary, then
rotate [M-CH] to select a memory channel number.
•All memory channels including blank channels can be
selected.
•“BLANK” appears when no information has been pro-
grammed into a memory channel.
w Push [V/M] to select memory mode.
•“MEMO” and contents of the memory channel appear.
DD
In memory mode
q Push [V/M] to select memory mode.
w Rotate [M-CH] to select a memory channel.
•All memory channels including blank channels can be
selected.
•Memory channels can also be selected using the micro-
phone [UP]/[DN] keys.
[V/M] [M-CH]
Disappears when a channel is programmed.
• During VFO mode
• During memory mode
MEMORY
MEMORY
TRANSFER OVER-
CHANNEL
CHANNEL CAPABILITY
TO VFO WRITING
CLEAR
NUMBER
Regular memory
1–99
One frequency and one mode
Yes Yes Yes
channels in each memory channel.
Scan edge
One frequency and one mode in
memory P1, P2 each memory channel as scan Yes Yes No
channels edges for programmed scan.
Call channel C Same as regular. No Yes No
IC-7400.qxd 02.4.2 11:35 Page 61
62
7
MEMORY OPERATION
■ Programming a memory
Memory channel programming can be preformed ei-
ther in VFO mode or in memory mode.
DD
Programming in VFO mode
q Set the desired frequency and operating mode in
VFO mode.
w Rotate [M-CH] to select the desired memory chan-
nel.
•“BLANK” appears if the selected memory channel is a
blank channel (and does not have contents).
e Push [MW] for 1 sec. to program the displayed fre-
quency and operating mode into the memory chan-
nel.
•3 beeps are emitted when memory programming is suc-
cessful.
DD
Programming in VFO mode
q Select the desired memory channel with [M-CH] in
memory mode.
• Memory channel contents appear in the display.
•“BLANK” appears and no frequency readout is displayed
if the selected memory channel is a blank channel (and
does not have contents).
w Set the desired frequency and operating mode in
memory mode.
•To program a blank channel, use direct frequency entry
with the keypad or memo pads, etc.
e Push [MW] for 1 sec. to program the displayed fre-
quency and operating mode into the memory chan-
nel.
•3 beeps are emitted when memory programming is suc-
cessful.
■ Memory clearing
Any unnecessary memory channels can be cleared.
The cleared memory channels become blank chan-
nels.
q Select memory mode with [V/M].
w Select the desired memory channel with [M-CH].
e Push [M-CL] for 1 sec. to clear the contents.
•The programmed frequency and operating mode disap-
pear.
•3 beeps are emitted when memory clearing is success-
ful.
r To clear other memory channels, repeat steps w
and e.
[V/M] [M-CH]
[MW]
AGC
DUP
CMP
TBW
SCP
• [EXAMPLE]: Programming 7.088 MHz/LSB
into memory channel 12.
AGC
DUP
CMP
TBW
SCP
• [EXAMPLE]: Programming 21.280 MHz/USB
into memory channel 18.
[V/M] [M-CH]
[M-CL]
IC-7400.qxd 02.4.2 11:35 Page 62
63
7
MEMORY OPERATION
2001 NEW 2001 NEW
■ Selecting the call channel
By default 145.00000 MHz/FM is programmed into the
call channel. However, this can be changed to suit
your operating preference. (see below)
q Push [CALL] to select the call channel.
•“C” appears.
w Push [CALL] again to return to the previous mode.
■
Programming the call channel
The call channel is programmed in the same way reg-
ular memory channels are. It’s convenient to program
a most-often-used frequency into the call channel for
quick recall. As with memory channels, the call chan-
nel can also hold split frequencies.
q Rotate [M-CH] to select the call channel.
•“C” appears.
w Select the desired frequency and operating mode
to program into the call channel.
e Push [MW] for 1 sec. to program the displayed fre-
quency and operating mode into the call channel.
•3 beeps are emitted when memory programming is suc-
cessful.
IMPORTANT!: When the call channel is selected
with the [CALL] switch, the frequency CANNOT be
changed using the tuning dial, band keys or keypad
input. However, when the call channel is selected
using [M-CH] in memory mode, the frequency CAN
be changed.
[CALL]
AGC
DUP
CMP
TON
SCP
“C” appears
[V/M] [M-CH]
[MW]
AGC
DUP
CMP
TON
SCP
IC-7400.qxd 02.4.2 11:35 Page 63
64
7
MEMORY OPERATION
2001 NEW
■ Frequency transferring
The contents of a memory channel (frequency, oper-
ating mode, etc.) can be transferred to the VFO.
Frequency transferring can be performed in either VFO
mode or memory mode.
DD
Transferring in VFO mode
This is useful for transferring programmed contents to
VFO.
q Select VFO mode with [V/M].
w Select the memory channel to be transferred with
[M-CH].
•“BLANK” appears if the selected memory channel is a
blank channel. In this case transferring is impossible.
e Push [V/M] for 1 sec. to transfer the frequency and
operating mode.
• 3 beeps are emitted.
DD
Transferring in memory mode
This is useful for transferring frequency and operating
mode while operating in memory mode.
When you have changed the frequency or operat-
ing mode in the selected memory channel:
• Displayed frequency and mode are transferred.
•Programmed frequency and mode in the memory
channel are not transferred, and they remain in the
memory channel.
q Select the memory channel to be transferred with
[M-CH] in memory mode.
• And, set the frequency or operating mode if required.
w Push [V/M] for 1 sec. to transfer the frequency and
operating mode.
•3 beeps are emitted when the transferring is successful.
•Displayed frequency and operating mode are transferred
to the VFO.
e To return to VFO mode, push [V/M] momentarily.
[V/M] [M-CH]
TRANSFERRING EXAMPLE IN VFO MODE
Operating frequency : 21.320 MHz/USB (VFO)
Contents of M-ch 16 : 14.018 MHz/CW
Push [V/M] for 1 sec.
TRANSFERRING EXAMPLE IN MEMORY MODE
Operating frequency : 14.020 MHz/CW (M-ch 16)
Contents of M-ch 16 : 14.018 MHz/CW
Set the frequency
Push [V/M] for 1 sec.
then push [V/M]
IC-7400.qxd 02.4.2 11:35 Page 64
65
7
MEMORY OPERATION
2001 NEW 2001 NEW
■ Programming scan edges
Memory channels P1 and P2 are the program scan
edges. They are used to program an upper and lower
frequency for programmed scan (p. 70). By default, P1
is programmed with 0.50000 MHz and P2 is pro-
grammed with 29.99999 MHz. If P1 and P2 are pro-
grammed with the same frequencies, programmed
scan will not proceed.
[EXAMPLE]: Programming 14.00000 MHz into P1
and 14.35000 MHz into P2.
q Push [V/M] to select VFO mode, if necessary.
w Rotate [M-CH] to select scan edge P1.
e Rotate the tuning dial to set 14.00000 MHz as the
lower frequency.
r Push [MW] for 1 sec. to program 14.00000 MHz
into scan edge P1.
• 3 beeps are emitted.
t Rotate [M-CH] to select scan edge P2.
y Rotate the tuning dial to set 14.35000 MHz as the
upper frequency.
u Push [MW] for 1 sec. to program 14.35000 MHz
into scan edge P2.
• 3 beeps are emitted.
•When programmed scan is activated (p. 70) scanning
will search the frequencies between 14.00000 MHz and
14.35000 MHz for signals.
[V/M]
Tuning dial
[M-CH]
[MW]
• After steps w to r
• After steps t to u
IC-7400.qxd 02.4.2 11:35 Page 65
66
7
MEMORY OPERATION
2001 NEW
■ Assigning memory names
All memory channels (including scan edges) can be
tagged with alphanumeric names of up to 9 characters
each.
[EXAMPLE]: Programming “DX spot” into memory
channel 99.
q Push [V/M] to select memory mode, if necessary.
w Rotate [M-CH] to select memory channel 99.
e Push [MENU] several times to select M2.
r Push [F2 MEM] to select the memory name screen.
t Push [F1 EDT] to edit memory channel name.
• A cursor appears and blinks.
•Memory channel names of blank channels cannot be
edited.
y Push [F1] several times to select the type of char-
acters for input.
•“ABC” inputs capital letters A to Z.
•“abc” inputs small letters a to z.
•“etc” is used to input other characters— ! # $ % & ¥ ? ”
’ ` ^ + – ✱ / . , : ; = < > ( ) [ ] { } | _
–
are available.
•Use the keypad to directly input numerals, “0” to “9,” in-
cluding a decimal point.
u Rotate the tuning dial to select the first character for
input.
i Push [F2 ç] or [F3 å] to move the cursor forwards
or backwards, respectively.
•Push [F5 SPC] to input a space and [F4 DEL] to delete
the selected character.
o Repeat steps w to i to program another memory
channel’s name, if desired.
!0 Push [MENU] to set the memory channel name and
return to the memory name menu.
• Push [MENU] 1 more times to return to M2.
[V/M]
Tuning dial
[M-CH][MENU]
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
SCN
MEM
SWR
TCN
VSC
EDT
(
)
SEL
14.195OO
USB
ABC
DEL
SPC
Push [F2 MEM]
Push [F2 MEM]
ABC
DEL
SPC
DX
• During assigning a memory name
abc
DEL
SPC
DX
spot
• After assigning a memory name
Input space
Delete a character
Move cursor forwards
Move cursor backwards
Selects character type
IC-7400.qxd 02.4.2 11:35 Page 66
67
7
MEMORY OPERATION
2001 NEW
■ Memo pads
The transceiver has a memo pad function to store fre-
quency and operating mode for easy write and recall.
The memo pads are separate from memory channels.
The default number of memo pads is 5, however, this
can be increased to 10 in set mode if desired. (p. 84)
DD
Writing frequencies and operating
modes into memo pads
➥ Push [MP-W] to store the displayed frequency and
operating mode into a memo pad.
•Each push of [MP-W] stores a frequency and mode into
the next available memo pad; when you write a 6th (or
11th) frequency and operating mode, the oldest written
frequency and operating mode are automatically erased
to make room for the new settings.
DD
Recalling a memo pad
➥ Push [MP-R] to recall a memo pad.
•Each push of [MP-R] recalls a memo pad, starting from
the most recently written.
NOTE: Each memo pad must have its own unique
combination of frequency and operating mode;
memo pads having identical settings cannot be writ-
ten.
AGC
DUP
CMP
TBW
SCP
MP
-
W
Erased
In this example, pushing [MP-W] enters 21.28000 MHz
USB into the top memo pad and erases the oldest
memo pad (21.34724 MHz LSB).
• Displayed frequency and mode • Stored in next available memo pad
AGC
DUP
CMP
TBW
SCP
• VFO or memory mode • Memo pads
MP
-
R
MP
-
R
IC-7400.qxd 02.4.2 11:35 Page 67
8
68
SCANS
2001 NEW
■ Scan types
■ Preparation
• Channels
For programmed scan:
Program scan edge frequencies into scan edge mem-
ory channels P1 and P2.
For
∂∂
F scan:
Set the ∂F span (∂F scan range) in the scan screen.
For memory scan:
Program 2 or more memory channels except scan
edge memory channels.
For select memory scan:
Designate 2 or more memory channels as select mem-
ory channels. To designate the channel as a select
memory channel, choose a memory channel, then
push [F3 SEL] in the scan screen, or push [F5 SEL]
in the memory name screen.
• Scan resume ON/OFF
You can select the scan to resume or cancel when de-
tecting a signal, in set mode. Scan resume ON/OFF
must be set before operating a scan. See p. 70 for
ON/OFF setting and scan resume condition details.
• Scan speed
Scan speed can be selected from 2 levels, high or low,
in set mode. See p. 69 for details.
• Squelch condition
PROGRAMMED SCAN
Repeatedly scans between two scan edge frequencies
(scan edge memory channels P1 and P2).
This scan operates in VFO mode.
SELECT MEMORY SCAN
Repeatedly scans all selected memory channels.
∂F SCAN
Repeatedly scans within ∂F span area.
This scan operates in memory mode.This scan operates in memory mode.
This scan operates in both VFO and memory modes.
Scan
Scan edge
P1 or P2
Scan edge
P2 or P1
Jump
Mch 1 Mch 5
Mch 2 Mch 3 Mch 4
Mch 6Mch 7Mch 99
MEMORY SCAN
Repeatedly scans all programmed memory channels.
Mch 1 Mch 5
Mch 2 Mch 3 Mch 4
Mch 6Mch 7Mch 99
SEL
SELSEL
SEL
SEL
SEL
SELSEL
SEL
SEL
ScanScan
–
∂F frequency +∂F frequency
Start frequency
Jump
SQUELCH
CLOSED
SQUELCH
OPEN
Scan stops when detecting a signal.
If you set scan resume ON in scan set
mode, the scan pauses for 10 sec. when
detecting a signal, then resumes. When a
signal disappears while scan is paused,
scan resumes 2 sec. later.
The scan continues
until it is stopped
manually, and does
not pause even if it
detects signals.
Scan pauses on
each channel when
the scan resume is
ON; not applicable
when OFF.
SCAN
PROGRAMMED
STARTS
SCAN
MEMORY SCAN
WITH
IC-7400.qxd 02.4.2 11:35 Page 68
69
8
SCANS
2001 NEW 2001 NEW
■ Voice squelch control function
This function is useful when you don’t want unmodu-
lated signals pausing or cancelling a scan. When the
voice squelch control function is activated, the receiver
checks received signals for voice components.
If a receiver signal includes voice components, and the
tone of the voice components changes within 1 sec.,
scan pauses (or stops). If the received signal includes
no voice components or the tone of the voice compo-
nents does not change within 1 sec., scan resumes.
➥ While M2 is selected with [MENU], push [F5 VSC]
to switch the VSC (Voice Squelch Control) function
ON and OFF.
•“VSC” appears when the function is activated.
• The VSC function activates for any scan.
•The VSC function resumes the scan on unmodu-
lated signals, regardless of whether the scan re-
sume condition is set to ON or OFF.
■ Scan set mode
When the squelch is open, scan continues until it is
stopped manually— it does not pause on detected sig-
nals. When squelch is closed, scan stops when de-
tecting a signal, then resumes according to the scan
resume condition. Scan speed and the scan resume
condition can be set using the scan set mode.
q Push[MENU] to select M2.
w Push [F1 SCN] to select scan menu.
e Push [F5 SET] to select scan set mode.
r Push [F1 ≤] or [F2 ≥] to select SCAN Speed
item.
t Rotate the tuning dial to select scan speed from
high and low.
•“HIGH” : scan is faster
•“LOW” : scan is slower
y Push [F2 ≥] to select SCAN Resume item.
u Rotate the tuning dial to select scan resume func-
tion from ON and OFF.
•“ON” : when detecting a signal, scan pauses for
10 sec., then resumes. When a signal disap-
pears, scan resumes 2 sec. later.
•“OFF” : when detecting a signal, cancels scanning.
i Push [MENU] to return to scan menu.
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
SCN
MEM
SWR
TCN
VSC
PRO
∂
F
FIN
SPN
SET
∂
F:±1Ok
Push [F1]
Push [F5]
SCAN
Speed
HIGH
1
Push [F1] or [F2]
SCAN
Resume
ON
2
F 1
F 2 F 3 F 4 F 5
SCN
MEM
SWR
TCN
VSC
Push [F5] to turn the VSC function ON and OFF.
VSC indicator
IC-7400.qxd 02.4.2 11:35 Page 69
70
8
SCANS
2001 NEW
■ Programmed scan/Fine programmed scan (VFO mode)
Programmed scan searches for signals between scan
edge memory channels P1 and P2. The default fre-
quencies for these memories are 0.500000 MHz and
29.99999 MHz, respectively. See p. 65 for scan edges
programming.
q Push [V/M] to select VFO mode, if necessary.
w Select the desired operating mode.
•The operating mode can also be changed while scan-
ning.
e Push [TS] to select a tuning step.
• The tuning step can also be changed while scanning.
r Push [MENU] to select M2.
t Push [F1 SCN] to select the scan menu.
• See p. 68 for scan condition.
•If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
y Push [F1 PRO] to start the programmed scan.
• The MHz and kHz decimal points blink while scanning.
u When the scan detects a signal, the scan stops,
pauses or ignores it depending on the resume, VSC
setting and the squelch condition.
i To cancel the scan, push [F1 PRO].
•Rotating the tuning dial during scan also cancels scan
operation.
If the same frequencies are programmed into the
scan edge memory channel P1 and P2, pro-
grammed scan does not start.
DD
About the Fine programmed scan
During programmed scan, when a signal is received,
scan continues, but the tuning step is temporarily set to
10 Hz.
q Follow steps q to y above to start programmed
scan.
w During programmed scan, push [F3 FIN] to switch
between programmed scan and fine programmed
scan operation.
e Push [F1 PRO] to cancel the scan.
•Rotating the tuning dial during scan also cancels scan
operation.
[TS]
Tuning dial
[MENU]
[V/M]
Mode keys
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
F 1
F
2F
3
F
4
F
5
SCN
MEM
SWR
TCN
VSC
PRO
∂
F
FIN
SPN
SET
∂
F:±1Ok
PRO
∂
F
FIN
SPN
SET
PROG
SCAN
Push [F1]
Push [F1] to start/cancel the scanning.
Push [F1]
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
PRO
∂
F
FIN
SPN
SET
PROG
SCAN
PRO
∂
F
FIN
SPN
SET
F-PROG
SCAN
Push [F3] to switch
between programmed
scan and fine pro-
grammed scan.
IC-7400.qxd 02.4.2 11:35 Page 70
71
8
SCANS
2001 NEW 2001 NEW
■ Memory scan operation (Memory mode)
Memory scan searches through memory channel 1 to
99 for signals. Blank (unprogrammed) memory chan-
nels are skipped.
q Push [V/M] to select memory mode, if necessary.
w Push [MENU] to select M2.
e Push [F1 SCN] to select the scan menu.
• See p. 69 for scan condition.
•If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
r Push [F1 MEM] to start the memory scan.
• The MHz and kHz decimal points blink while scanning.
•At least 2 memory channels must be programmed for
memory scan to proceed.
t To cancel the scan, push [F1 MEM].
•Rotating the tuning dial during scan also cancels scan
operation.
■ Select memory scan
Select memory scan searches through memory chan-
nels set as “select,” for signals. See below for setting
and deleting select memory channels.
q Follow the steps q to r above to start memory
scan.
w During memory scan, push [F3 SEL] to switch be-
tween memory scan and select memory scan.
•At least 2 memory channels must be set as the select
channel.
e Push [F1 MEM] to cancel the scan.
•Rotating the tuning dial during scan also cancels scan
operation.
DD
Setting/Cancelling select memory channels
All memory channels, except scan edges (P1 and P2),
can be set as a select memory channels.
➥ While the scan menu is selected, push [F3 SEL] to
set/cancel the displayed memory channel as a se-
lect channel; or while memory name screen is indi-
cated, push [F5 SEL] to set/cancel the displayed
memory channel as a select memory channel.
•“SEL” appears when the channel is set as a select mem-
ory channel.
•“SEL” disappears when cancelled.
•Push [F3 SEL]/[F5 SEL] for 1 sec to cancel all select
memory settings.
Tuning dial[MENU]
[V/M]
F 1
F
2F
3
F
4
F
5
MEM
∂
F
SEL
SPN
SET
MEMO
SCAN
Push [F1] to start/cancel the scanning.
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
MEM
∂
F
SEL
SPN
SET
MEMO
SCAN
MEM
∂
F
SEL
SPN
SET
SEL-MEMO
SCAN
Push [F3] to switch
between memory scan
and select memory
scan.
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
∂
F:±1Ok
MEM
∂
F
SEL
SPN
SET
Push [F3] to set/cancel as a select channel.
Select memory inidcator
Push [F3] to set/cancel as a select channel.
EDT
(
)
SEL
14.195OO
USB
• Scan menu
• Memory name screen
IC-7400.qxd 02.4.2 11:35 Page 71
72
8
SCANS
2001 NEW
■
∂∂
F scan operation and Fine ∂F scan
∂ F scan searches for signals within the specified
range with the displayed VFO or memory channel fre-
quency as for center frequency. The frequency range
is specified by the span.
q Push [V/M] to select VFO mode or memory mode,
as desired.
w Set center frequency of the ∂F scan.
e Push [MENU] to select M2.
r Push [F1 SCN] to select the scan menu.
• See p. 68 for scan condition.
•If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
t Set the ∂F span by pushing [F4 SPN].
•±5 kHz, ±10 kHz, ±20 kHz, ±50 kHz, ±100 kHz,
±500 kHz and ±1 MHz are selectable.
y Push [F2 ∂F] to start the ∂F scan.
• Decimal points blink while scanning.
u When the scan detects a signal, the scan stops,
pauses or ignores it depending on the VSC, resume
setting and the squelch condition.
i Push [F2 ∂F] to cancel the ∂F scan.
•Rotating the tuning dial during scan also cancels scan
operation.
DD
About the Fine
∂∂
F scan
During ∂F scan, when a signal is received, scan con-
tinues, but the tuning step is temporarily set to 10 Hz.
q Follow steps q to y above to start programmed
scan.
w During ∂F scan, push [F3 FIN] to switch between
∂F scan and fine ∂F scan operation.
e Push [F2 ∂F] to cancel the scan.
•Rotating the tuning dial during scan also cancels scan
operation.
Keypad
Tuning dial
[MENU]
[V/M]
F 1
F
2F
3
F
4
F
5
F 1
F 2 F 3 F 4 F 5
F 1
F
2F
3
F
4
F
5
SCN
MEM
SWR
TCN
VSC
PRO
∂
F
FIN
SPN
SET
∂
F:±1Ok
PRO
∂
F
FIN
SPN
SET
∂
F
SCAN
Push [F1]
Push [F2] to start/cancel the scanning.
Push [F2]
Push [F4] to select the span.
F 1
F
2F
3
F
4
F
5
F 1
F
2F
3
F
4
F
5
PRO
∂
F
FIN
SPN
SET
∂
F
SCAN
PRO
∂
F
FIN
SPN
SET
F-
∂
F
SCAN
Push [F3] to switch
between programmed
scan and fine pro-
grammed scan.
IC-7400.qxd 02.4.2 11:35 Page 72
73
8
SCANS
2001 NEW
■ Tone scan/DTCS code scan operation
By monitoring a signal that is being operated with a re-
peater, tone squelch or DTCS, you can determine the
tone frequency necessary to open a repeater or the
squelch.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TONE] for 1 sec. to enter tone set mode.
r Push [F1 TON] to select the tone type to be
scanned.
•“Rptr Tone” for repeater tone, “TSQL Tone” for
tone squelch and “DTCS Code” for DTCS code can be
selected.
•When selecting DTCS code to be scanned, push [F5]
several times to select the DTCS code polarity.
“NN” : Normal polarity for both transmit and receive.
“NR” : Normal polarity for transmit and reverse polarity
for receive.
“RN” : Reverse polarity for transmit and normal polarity
for receive.
“RR” : Reverse polarity for both transmit and receive.
t Push [F2 SCN] to start the tone scan function.
•“Rptr Tone SCAN,” “TSQL Tone SCAN” or
“DTCS Code SCAN” blinks when repeater tone scan,
tone squelch scan or DTCS code scan is operated, re-
spectively.
y When a matched tone or code is found, the scan
pauses and the tone frequency or code is set for the
selected tone as in step r.
When the tone scan or DTCS code scan is operated
in memory or call channel mode, the detected tone fre-
quency or code can be used temporarily.
To keep the detected tone frequency or code setting
for memory contents, you must over-write the memory
or call channel.
u Push [F2 SCN] to cancel the tone scan function.
•Rotating the tuning dial during scan also cancels scan
operation.
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
F 1
F 2 F 3 F 4 F 5
AGC
DUP
CMP
TON
SCP
TON
SCN
88.5Hz
Rptr
Tone
TON
SCN
88.5Hz
Rptr
Tone
SCAN
Push [F4] for 1 sec.
Push [F1] several times to select tone type.
• Repeater tone scan
• Tone squelch tone scan
• DTCS code scan
TON
SCN
88.5Hz
TSQL
Tone
SCAN
TON
SCN
O23-NN
DTCS
Code
SCAN
Push [F2] to start/cancel the scan.
Push [F2] to start/cancel the scan.
Push [F2] to start/cancel the scan.
Push [F1] several times to select polarity.
IC-7400.qxd 02.4.2 11:35 Page 73
9
74
ANTENNA TUNER OPERATION
2001 NEW
■ Antenna connection and selection
The IC-7400 has 2 antenna connectors for the
HF/50 MHz bands, [ANT1] and [ANT2], and 1 antenna
connector for the 144 MHz band; a total of 3 antenna
connectors.
For each operating band the IC-7400 covers, there is a
band memory which can memorize a selected an-
tenna. When you change the operating frequency be-
yond a band, the previously used antenna is automat-
ically selected (see below) for the new band. This
function is convenient when you use 2 antennas for HF
and 50 MHz bands operation.
• Antenna select function: “Auto”
Once an antenna has been selected for use with a
band by pushing [ANT], the antenna is automatically
selected whenever that band is accessed.
[EXAMPLE]: a 3.5/7 MHz antenna is connected to
[ANT1], a 21/28/50 MHz antenna is connected to
[ANT2]. When the antenna selector function is set to
“Auto,” an antenna is automatically selected when
changing bands.
• Antenna select function: “Manual”
When “Manual” is selected, you can use the [ANT1]
and [ANT2], however, band memory does not func-
tion. In this case you must select an antenna manu-
ally. However, the 144 MHz antenna will still be
selected automatically.
[EXAMPLE]: an optional antenna tuner and HF an-
tenna are connected to [ANT1] and a 50 MHz an-
tenna is connected to [ANT2].
• Antenna select function: “OFF”
In this case, only [ANT1] and the 144 MHz antenna
connector can be used. [ANT] switch does not func-
tion.
[ANT]
144 MHz 21/28/50 MHz 3.5/7 MHz
[ANT1][ANT2]
144 MHz band 50 MHz band HF bands
[ANT1][ANT2]
AH-4
IC-7400.qxd 02.4.2 11:35 Page 74
75
9
ANTENNA TUNER OPERATION
2001 NEW 2001 NEW
■ Antenna tuner operation
The internal automatic antenna tuner matches the
transceiver to the connected antenna automatically.
Once the tuner matches an antenna, the variable ca-
pacitor angles are memorized as a preset point for each
frequency range (100 kHz steps). Therefore, when you
change the frequency range, the variable capacitors are
automatically preset to the memorized point.
CAUTION: NEVER transmit with the tuner ON
when no antenna is connected. This will damage
the transceiver. Be careful of the antenna selection.
DD
TUNER OPERATION
➥ Push [TUNER] to turn the internal antenna tuner
ON. The antenna is tuned automatically when the
antenna SWR is higher than 1.5:1.
• When the tuner is ON, the “TUNE” indicator appears.
• MANUAL TUNING
During SSB operation at low voice levels, the internal
tuner may not be tuned correctly. In such cases, man-
ual tuning is helpful.
➥ Push [TUNER] for 1 sec., to start manual tuning.
•A side tone is emitted and “TUNE” indicator blinks while
tuning.
•If the tuner cannot reduce the SWR to less than 1.5:1
after 20 sec. of tuning, the [TUNER] switch indicator
goes out.
• AUTOMATIC TUNER START (HF bands only)
If you want to deactivate the tuner under conditions
of VSWR 1.5:1 or less, use the auto tuner start func-
tion and turn the tuner OFF. This function activates
the tuner automatically when the SWR exceeds 1.5:1.
This function is turned ON in set mode. (p. 83).
• PTT TUNER START
The tuner is always tuned when the PTT is pushed
after the frequency is changed (more than 1% from
last-tuned frequency). This function removes the
“push and hold [TUNER]” operation and activates for
the first transmission on a new frequency.
This function is turned ON in set mode. (p. 83).
• Antenna tuner of the IC-PW1
When using an external antenna tuner such as the
IC-PW1’s tuner, tune with the external antenna tuner,
while the internal tuner is turned OFF. After tuning is
completed, turn the internal tuner ON. Otherwise,
both tuners tune simultaneously and correct tuning
may not be obtained.
See the instruction manual included with each an-
tenna tuner for their respective operations.
[TUNER]
DD
If the tuner cannot tune the antenna
Check the following and try again:
• the [ANT] connector selection.
• the antenna connection and feedline.
•the unaltered antenna SWR.
(Less than 3:1 for HF bands;
Less than 2.5:1 for 50 MHz band)
•the transmit power. (8 W for HF bands; 15 W for 50 MHz
band)
• the power source voltage/capacity.
If the tuner cannot reduce the SWR to less than 1.5:1
after checking the above, perform the following:
• repeat manual tuning several times.
• tune with a 50 Ω dummy load and re-tune the antenna.
• turn power OFF and ON.
•adjust the antenna cable length.
(This is effective for higher frequencies in some cases.)
•Some antennas, especially for low bands, have a nar-
row bandwidth. These antennas may not be tuned at the
edge of their bandwidth, therefore, tune such an an-
tenna as follows:
[Example]: Suppose you have an antenna which has an
SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.
q Push [TUNER] to turn the antenna tuner ON.
w Select CW mode.
e Turn OFF the break-in function. (p. 55)
r Push [TRANSMIT] to set to the transmit condition.
t Set 3.55 MHz and key down.
y Set 3.80 MHz and key down.
u Push [TRANSMIT] to return to the receive condition.
NOTES:
•The internal antenna tuner can only tune the HF and
50 MHz bands— the 144 MHz band cannot be tuned.
•NEVER transmit without an antenna properly connected
to antenna port in use.
•When 2 antennas are connected, select the antenna to
be used with [ANT].
•If the SWR is higher than about 1.5:1 when tuning above
100 kHz on an antenna’s preset point, push [TUNER] for
1 sec. to start manual tuning.
•The internal tuner may not be able to tune in AM mode. In
such cases, push [TUNER] for 1 sec. to manually tune.
IC-7400.qxd 02.4.2 11:35 Page 75
76
9
ANTENNA TUNER OPERATION
2001 NEW
■ Optional external tuner operation
DD
AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER
The AH-4 matches the IC-7400 to a long wire antenna
more than 7 m/23 ft long (3.5 MHz and above).
•See the AH-4 instruction manual for AH-4 installation and
antenna connection details.
NEVER operate the AH-4 without an antenna wire.
The tuner and transceiver will be damaged.
NEVER operate the AH-4 when it is not grounded.
Transmitting before tuning may damage the trans-
ceiver. Note that the AH-4 cannot tune when using a
1
⁄2 λ long wire or multiple of the operating frequency.
When connecting the AH-4, the antenna connector
assignments are [ANT2] for the internal tuner and
[ANT1] for the AH-4. The antenna indicator in the
LCD displays “EXT” when the AH-4 is connected
and selected.
DD
AH-4 operation
Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency— even slightly.
q Set the desired frequency in an HF or 50 MHz
band.
•The AH-4 may not operate on frequencies outside of
ham bands.
w Push [TUNER] for 1 sec.
•“TUNER” blinks while tuning.
e “TUNE” appears constantly when tuning is com-
plete.
•When the connected wire cannot be tuned, the “TUNE”
indicator goes out, and the AH-4 is bypassed. At that
point the antenna wire connection root is to the trans-
ceiver directly, and not via AH-4 antenna tuner.
r
To bypass the AH-4 manually, push [TUNER].
AH-4 setting example:
R WARNING: HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting.
For mobile operation
For outdoor operation
Long wire
Optional AH-2b
antenna element
[TUNER]
Coaxial cable (from AH-4)
ANT1
Transceiver
Ground
AH-4
Control cable
Long wire or optional AH-2b
• Connecting the AH-4
IC-7400.qxd 02.4.2 11:35 Page 76
10
77
DATA COMMUNICATION
2001 NEW
■ Connections
■ When connecting to [DATA]
• When using a PC application
• When using a TNC
q DATA IN
w GND
r DATA OUT (9600 bps)
y P SQL*
t AF OUT (1200 bps)
e PTT P
TX AUDIO
GND
RX AUDIO
SQL
PTT
q DATA IN
w GND
r DATA OUT (9600 bps)
y P SQL*
t AF OUT (1200 bps)
e PTT P
TX AUDIO
GND
TNC
PC
RS-232C
RX AUDIO
SQL
PTT
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
*When connecting the squelch line, consult the necessary manual (TNC, etc.)
PC
RS-232C
TNC or scan converter
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
■ When connecting to [ACC(1)]
• When using a PC application
• When using a TNC
1
2
3
4
5
6
7
8
Rear panel view
RTTY
GND
AF
SEND
RTTY
GND
AF
SEND
RTTY OUTPUT
GND
AUDIO INPUT
PTT
RTTY OUTPUT
GND
AUDIO INPUT
PTT
1
2
3
4
5
6
7
8
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
■ When connecting to [MIC]
• When using a PC application
• When using a TNC
PC
RS-232C
TNC or scan converter
MIC INPUT
AF OUTPUT
MIC GND
GND
PTT*
PTT*
MIC INPUT
AF OUTPUT
MIC GND
GND
PTT*
AUDIO OUTPUT
AF INPUT
GND
SQL
AFSK OUTPUT
AF INPUT
GND
PTT*
SQL INPUT
*When using the VOX function, no need to connect. Refer to the instruction
manual of the external equipment (TNC, etc.).
When connecting the squelch line, consult the necessary manual (TNC, etc.).
IC-7400.qxd 02.4.2 11:35 Page 77
78
10
DATA COMMUNICATION
■ Packet (AFSK) operation
Before operating packet (AFSK) be sure to consult the
operating manual that came with your TNC.
q Connect a TNC and PC. (p. 77)
w Push a band key to select an operating band.
e Push [SSB] or [AM/FM] to select the desired operat-
ing mode.
•After LSB or USB is selected, push [SSB] for 1 sec. to
select LSB data or USB data mode, or after AM or FM is
selected, push [AM/FM] for 1 sec. to select AM data or
FM data mode.
•Generally, LSB is used on HF bands and FM is used for
packet operation on the VHF band.
r Rotate the tuning dial to tune the desired signal.
t Transmit your AFSK signals using your computer’s
keyboard.
• Rotate [RF PWR] to set the output power.
•Relative strength of the transmitted signal is indicated in
the Po meter while operating the TNC.
•When operating in SSB (data) mode, adjust output
power so that the ALC reading in the ALC meter stays
in the ALC zone.
NOTE: When connecting a TNC to the ACC socket
on the rear panel, select SSB (LSB/USB) data mode
or disconnect the microphone and rotate [MIC
GAIN] fully counterclockwise.
When SSB data mode is selected, the audio input
from the [MIC] connector is automatically cut, and
the audio input from the [ACC(1)] is used.
Also, when the SSB data mode is selected, the fixed
setting listed below are selected automatically;
• Speech compressor : OFF
• Transmit bandwidth : MID
• Tx tone (Bass) : 0
• Tx tone (Treble) : 0
DD
Frequency indication during AFSK operation
When operating AFSK in SSB mode, the indicated fre-
quency is the signals carrier point.
Band keys[TX] indicator[TRANSMIT]
[MIC GAIN] [AM/FM] Tuning dial
Selected mode indicator appears
[SSB]
• Example— LSB/LSB data mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz 2125 Hz
Carrier point
(Displayed frequency)
IC-7400.qxd 02.4.2 11:35 Page 78
79
10
DATA COMMUNICATION
2001 NEW
■ Adjusting the TNC output level
When setting data transmission speed to 9600 bps,
the data signal coming from the TNC is applied exclu-
sively to the internal limiter circuitry to automatically
maintain band width.
NEVER apply data levels from the TNC of over 0.6 V
p-p, otherwise the transceiver will not be able to main-
tain the band width and may possibly interfere with
other stations.
DD
Using with a level meter or synchroscope
When using a level meter or synchroscope, adjust the
TX audio output level (DATA IN level) from the TNC as
follows.
0.4 V p-p (0.2 Vrms) : recommended level
0.2–0.5 V p-p (0.1–0.25 Vrms) : acceptable level
DD
Not using a measuring device
q Connect the transceiver to a TNC. (p. 77)
w Enter a test mode (“CAL,” etc.) on the TNC, then
transmit some test data.
e When the transceiver fails to transmit the test data
or transmits sporadically (TX indicator doesn’t light
or flashes):
-Decrease the TNC output level until the transmit
indicator lights continuously.
When transmission is not successful even though
the TX indicator lights continuously:
- Increase the TNC output level.
■ Data transmission speed
For data communication (in FM mode), the transceiver
can be set to to a maximum data speeds of 9600 bps
(or less; 1200, 2400 or 4800 bps).
q Push [MENU] for 1 sec. to enter set mode.
w Push [F1 ≤] or [F2 ≥] to select the 9600bps
Mode item.
e Rotate the tuning dial to turn the 9600 bps mode ON
and OFF.
ON : 9600 bps of data speed
OFF : 1200, 2400 or 4800 bps of data speed
(default)
r Push [MENU] to return to previous indication.
21
ON
96OObps
Mode
21
OFF
96OObps
Mode
Select with the tuning dial
IC-7400.qxd 02.4.2 11:35 Page 79
11
80
SET MODE
2001 NEW
2. LCD Backlight
This item adjusts the brightness of the LCD from 0%
to 100% in 1% steps.
(default: 50%)
LCD
Backlight
5O%
2
■ General set mode
DD
Entering set mode
Set mode is used for programming infrequently
changed values or conditions of functions.
• Set mode operation
q Push [MENU] several times to select the function
menu indication, if necessary.
w Push [MENU] for 1 sec. to enter the set mode.
e Push [F1 ≤] or [F2 ≥] to select the desired item.
r Set the desired condition using the tuning dial.
•Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] to exit the set mode.
DD
Set mode items
1. LCD Contrast
This item adjusts the contrast of the LCD from 0% to
100% in 1% steps.
(default: 50%)
LCD
Contrast
5O%
1
3. Beep Level
This item adjusts the volume level for confirmation
beep tones from 0% to 100% in 1% steps. When the
beep tones, item 6. Beep (p. 81), are turned OFF,
this setting has no effect.
(default: 50%)
Beep
Level
3
5O%
4. Beep Level-lmt
This item allows you to set a maximum volume level
for confirmation beep tones. Confirmation beep tones
are linked to the [AF] control until a specified volume
level is reached— further rotation of the [AF] control
will not increase the volume of the beep tones.
ON Confirmation beep ON (default)
OFF Confirmation beep OFF
Beep
Level-lmt
4
ON
[F1 ≤]
Tuning dial[MENU]
[F2 ≥]
5. CAL. Marker
This item is used for a simple frequency check of the
transceiver.
ON Calibration marker ON
OFF Calibration marker OFF (default)
See p. 93 for calibration procedure.
Turn the calibration marker OFF after checking the
frequency of the transceiver.
Cal.
Marker
5
OFF
IC-7400.qxd 02.4.2 11:35 Page 80
81
11
SET MODE
2001 NEW 2001 NEW
6. Beep
A beep sounds each time a switch is pushed to con-
firm it. This function can be turned OFF for silent op-
eration.
ON Confirmation beep ON (default)
OFF Confirmation beep OFF
The volume level can be set in 3. Beep Level.
(p. 80)
Beep
6
ON
7. Band Edge Beep
A beep sounds when an operating frequency enters
or exits an amateur band. This functions independent
of the confirmation beep setting (above).
ON Band edge beep ON (default)
OFF Band edge beep OFF
The volume level can be set in 3. Beep Level.
(p. 80)
Band
Edge
Beep
7
ON
8. RF/SQL Control
The [RF/SQL] control can be set as the RF/squelch
control (default), the squelch control only (RF gain is
fixed at maximum) or ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM).
RF+SQL [RF/SQL] control as RF/squelch con-
trol (default)
SQL [RF/SQL] control as squelch control
AUTO [RF/SQL] control as RF gain control
in SSB, CW and RTTY; squelch con-
trol in AM and FM
RF/SQL
Control
8
RF+SQL
9. Meter Peak Hold
This item turns the meter peak hold function ON and
OFF. When set to ON (default), peak meter readings
are displayed for about 0.5 sec.
Meter
Peak
Hold
9
ON
10. COMP Meter
This item turns the COMP meter indication ON and
OFF during transmit. When set to ON, the COMP
meter is displayed instead of the SWR meter.
(default: OFF)
1
O OFF
COMP
Meter
■ General set mode (continued)
IC-7400.qxd 02.4.2 11:35 Page 81
82
11
SET MODE
2001 NEW
11. Quick SPLIT
When this item is set to ON, pushing [SPLIT] for 1
sec. sets the transmit frequency using the displayed
frequency and the split offset, set in SPLIT Off-
set item below, and activates the split function au-
tomatically.
ON Quick split ON (default)
OFF Quick split OFF
11
ON
Quick
SPLIT
12. SPLIT Offset
This item sets the offset (difference between transmit
and receive frequencies) for the quick split function.
The offset frequency can be set from –9.999 MHz to
+9.999 MHz in 1 kHz steps.
12
O.OOOMHz
SPLIT
Offset
13. SPLIT LOCK
When this item is ON, the tuning dial can be used to
adjust the transmit frequency while pushing [XFC]
even while the dial lock function is activated.
ON Split lock function ON
OFF Split lock function OFF (default)
13
OFF
SPLIT
LOCK
14. DUP Offset HF
This item sets the offset (difference between transmit
and receive frequencies) for duplex operation. How-
ever, this setting is used to input the repeater offset
for an HF band only.
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
14
O.1OOMHz
DUP
Offset
HF
15. DUP Offset 50M
This item sets the offset (difference between transmit
and receive frequencies) for duplex operation. How-
ever, this setting is used to input the repeater offset
for a 50 MHz band only.
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
15
O.5OOMHz
DUP
Offset
5OM
■ General set mode (continued)
16. DUP Offset 144M
This item sets the offset (difference between transmit
and receive frequencies) for duplex operation. How-
ever, this setting is used to input the repeater offset
for a 144 MHz band only.
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
16
O.6OOMHz
DUP
Offset
144M
IC-7400.qxd 02.4.2 11:35 Page 82
83
11
SET MODE
2001 NEW 2001 NEW
22. [ANT] Switch
You can set the antenna connector selection to auto-
matic, manual or non-selection (when using 1 an-
tenna only for the HF/50 MHz bands).
Auto : The antenna switch is activated and
the band memory memorizes the se-
lected antenna. (default)
Manual: The antenna switch is activated and
selects an antenna manually.
OFF : The antenna switch is not activated
and does not function. The [ANT1] con-
nector is always selected in this case.
22
Auto
[ANT]
Switch
17. One Touch Rptr
This item turns the one touch repeater function ON
(DUP- or DUP+) and OFF.
When [F2 DUP] is pushed for 1 sec. in M1, the se-
lected offset direction and the programmed duplex
offset frequency (depending on the operating fre-
quency band) is set with the displayed frequency.
17
DUP-
One
Touch
Rptr
19. Auto Tune
The internal antenna tuner has an automatic start ca-
pability which starts tuning if the SWR is higher than
1.5–3:1 in the HF bands.
When “OFF” is selected, the tuner remains OFF even
when the SWR is poor (1.5–3:1). When “ON” is se-
lected, automatic tune starts even when the tuner is
turned OFF.
19
OFF
Auto
Tune
20. PTT Tune
Tuning of the internal or external antenna tuner can
be started automatically at the moment the PTT is
pushed after the operating frequency is changed
(more than 1% from the last-tuned frequency).
2O
OFF
PTT
Tune
21. 96OObps Mode
This item turn the 9600 bps data transmission capa-
bility ON and OFF.
ON : For 9600 bps data transmission.
OFF : For the regular audio (or slower data)
transmission only.
21
OFF
96OObps
Mode
■ General set mode (continued)
IC-7400.qxd 02.4.2 11:35 Page 83
84
11
SET MODE
2001 NEW
23. SPEECH Language
When the optional UT-102
VOICE SYNTHESIZER UNIT
is
installed, you can select between English and Japan-
ese as the language.
English : Announces in English (default)
Japanese : Announces in Japanese
See p. 89 for unit installation.
23
English
SPEECH
Language
24. SPEECH Speed
When the optional UT-102
VOICE SYNTHESIZER UNIT
is
installed, you can select between faster or slower
synthesizer output.
HIGH : Announces faster (default)
LOW : Announces slower
See p. 89 for unit installation.
24
HIGH
SPEECH
Speed
25. SPEECH S-Level
When the optional UT-102
VOICE SYNTHESIZER UNIT
is
installed, you can have frequency, mode and signal
level announcement. Signal level announcement can
be deactivated if desired.
ON : Announces operating frequency, mode
and receiving signal level. (default)
OFF : Announces operating frequency and
mode only.
See p. 90 for unit installation.
25
ON
SPEECH
S-Level
26. Memory Pad Ch
This item sets the number of memo pad channels
available. 5 or 10 memo pads can be set.
5 : 5 memo pads (default)
10: 10 memo pads
26
5
Memory
Pad
Ch
■ General set mode (continued)
IC-7400.qxd 02.4.2 11:35 Page 84
85
11
SET MODE
2001 NEW 2001 NEW
27. DIAL Auto TS
This item sets the auto tuning step function. When ro-
tating the tuning dial rapidly, the tuning step automat-
ically changes several times as selected.
There are 2 type of auto tuning steps: HIGH (Fastest)
and LOW (Faster).
HIGH : Auto tuning step is turned ON.
Approx. 5 times fastest tuning step
during rapid rotation (default)
LOW : Auto tuning step is turned ON.
Approx. 2 times faster tuning step dur-
ing rapid rotation
OFF : Auto tuning step is turned OFF.
27
HIGH
DIAL
Auto
TS
28. MIC U/D Speed
This item sets the rate at which frequencies are
scanned when the microphone [UP]/[DN] switches
are pushed and held. High or low can be selected.
HIGH : High speed (default, 50 tuning
steps/sec.)
LOW : Low speed (25 tuning steps/sec.)
28
HIGH
MIC
U/D
Speed
29. Quick RIT Clear
This item selects the RIT/∂TX frequency clearing in-
struction with [PBTC].
ON : Clears the RIT/∂TX frequency when
[PBTC] is pushed momentarily.
OFF : Clears the RIT/∂TX frequency when
[PBTC] is pushed for 1 sec. (default)
29
OFF
Quick
RIT
Clear
30. BW Popup (PBT)
This item turns the PBT shifting value indication ON
and OFF during [TWIN PBT] control operation. When
set to ON, the shifting value is displayed above the
multi-function switches.
(default: ON)
3O
ON
BW
Popup
(PBT)
31. BW Popup (FIL)
This item turns the IF filter width indication ON and
OFF when selecting with [FILTER]. When set to ON,
the filter width is displayed above the multi function
switches.
(default: ON)
31
ON
BW
Popup
(FIL)
■ General set mode (continued)
IC-7400.qxd 02.4.2 11:35 Page 85
86
11
SET MODE
2001 NEW
32. SSB/CW Synchronous Tuning
This item selects the displayed frequency shift func-
tion from ON and OFF.
When this function is activated, the receiving signal
can be kept in receive even when the operating mode
is changed between SSB and CW.
ON : The displayed frequency shifts when
the operating mode is changed be-
tween SSB and CW.
OFF : The displayed frequency does not shift.
(default)
The frequency shifting value may differ according
to the CW pitch setting.
32
OFF
SSB/CW
Sync
Tun
33. CW Normal Side
Selects the carrier point of CW mode from LSB and
USB.
LSB : The carrier point is set to LSB side.
(default)
USB : The carrier point is set to USB side.
33
LSB
CW
Normal
Side
34. KEYER 1st Menu
This item selects the appearing menu when [F4 KEY]
is pushed in M1 at first, from KEYER-Root and
KEYER-SEND.
KEYER-Root : Selects memory keyer
menu first (default)
KEYER-SEND : Selects keyer SEND menu
first
34 KEYER-Root
KEYER
1st
Menu
■ General set mode (continued)
35. External Keypad
This item sets the external keypad capability.
OFF : External keypad does not func-
tion. (default)
KEYER SEND : Pushing one of external keypad
switches, transmits the desired
keyer memory contents during
CW mode operation.
For your information
The diagram as at right shows the equivalent circuit of
an external keypad and connects to pin 3 and pin 7
of the [MIC] connector (p. 12)
To [MIC] connector pin e
To [MIC] connector pin u
1.5kΩ
±
5%
1.5kΩ
±
5%
2.2kΩ
±
5%
4.7kΩ
±
5%
S1
(T1/M1)
S2
(T2/M2)
S3
(T3/M3)
S4
(T4/M4)
USER EXTERNAL KEYPAD
35
OFF
External
Keypad
IC-7400.qxd 02.4.2 11:35 Page 86
87
11
SET MODE
2001 NEW 2001 NEW
38. CI-V Transceive
Transceive operation is possible with the IC-7400
connected to other Icom HF transceivers or receivers.
ON : Transceive ON (default)
OFF : Transceive OFF
When “ON” is selected, changing the frequency, op-
erating mode, etc. on the IC-7400 automatically
changes those of connected transceivers (or re-
ceivers) and vice versa.
38
ON
CI-V
Transceive
39. CI-V 731 Mode
When connecting the IC-7400 to the IC-735 for trans-
ceive operation, you must change the operating fre-
quency data length to 4 bytes.
•This item must be set to “ON” only when operating the
transceiver with the IC-735.
ON : 4 bytes of frequency data
OFF : 5 bytes of frequency data (default)
39
OFF
CI-V
731
Mode
■ General set mode (continued)
37. CI-V Address
To distinguish equipment, each CI-V transceiver has
its own Icom standard address in hexadecimal code.
The IC-7400’s address is 66h.
When 2 or more IC-7400’s are connected to an op-
tional CT-17
CI
-
V LEVEL CONVERTER
, rotate the tuning
dial to select a different address for each IC-7400 in
the range 01h to 7Fh.
37
66h
CI-V
Address
36. CI-V Baud Rate
This item sets the data transfer rate. 300, 1200, 4800,
9600, 19200 bps and “Auto” are available.
Auto : Auto baud rate (default)
3OO : 300 bps
12OO : 1200 bps
48OO : 4800 bps
96OO : 9600 bps
192OO : 19200 bps
When “Auto” is selected, the baud rate is automati-
cally set according to the connected controller or re-
mote controller.
36
Auto
CI-V
Baud
Rate
IC-7400.qxd 02.4.2 11:35 Page 87
88
11
SET MODE
2001 NEW
■ Tone control set mode
DD
Entering tone control set mode
Tone levels (bass and treble) for each transmit and re-
ceive audio can be set for each phone mode indepen-
dently.
• Set mode operation
q Push [MENU] several times to select M2.
w Push [F4 TCN] to select the tone control set mode.
e Push [F1 ≤] or [F2 ≥] to select the desired item.
r Push [SSB] or [AM/FM] to select the desired oper-
ating mode.
t Set the desired condition using the tuning dial.
• Push [F3] for 1 sec. to select a default value.
y Push [MENU] to exit the set mode.
DD
Tone control set mode items
[F1 ≤]
Tuning dial[MENU]
[F2 ≥] [F4 TCN]
1. TX Bass
This item adjusts the bass level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
TX
Bass
SSB
O
1
2. TX Treble
This item adjusts the treble level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
TX
Treble
SSB
O
2
3. RX Bass
This item adjusts the bass level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
RX
Bass
SSB
O
3
4. RX Treble
This item adjusts the treble level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
RX
Treble
SSB
O
4
IC-7400.qxd 02.4.2 11:35 Page 88
12
89
OPTION INSTALLATION
2001 NEW
■ Opening the transceiver’s case
Follow the case and cover opening procedures shown
here when you want to install an optional unit or adjust
the internal units, etc.
CAUTION:
DISCONNECT the DC power cable
from the transceiver before performing any work on
the transceiver. Otherwise, there is danger of elec-
tric shock and/or equipment damage.
q Remove the 2 screws from the left side of the trans-
ceiver to remove the carrying handle as shown at
right.
w Remove the 6 screws from the top of the trans-
ceiver and the 6 screws from the sides, then lift up
the top cover.
e Turn the transceiver upside down.
r Remove 6 screws from the bottom of the trans-
ceiver, then lift up the bottom cover.
■ UT-102
VOICE SYNTHESIZER UNIT
The UT-102 announces the accessed readout’s fre-
quency, mode, etc. (S-meter level can also be an-
nounced— p. 84) in a clear, electronically-generated
voice, in English (or Japanese).
➥ Push [LOCK/SPCH] for 1 sec. to announce the fre-
quency, etc.
q Remove the top and bottom covers as shown
above.
w Remove the protective paper attached to the bot-
tom of the UT-102 to expose the adhesive strip.
e Plug UT-102 into J1920 on the MAIN unit as shown
in the diagram at right.
r Adjust the trimmer, SPCH LVL: R1925 on the MAIN
unit, to set the speech level if desired. Refer to the
illustration at right.
t Return the top and bottom covers to their original
positions.
MAIN unit
UT-102
J1920
R1925
IC-7400.qxd 02.4.2 11:36 Page 89
90
12
OPTION INSTALLATION
■ CR-338
HIGH STABILITY CRYSTAL UNIT
By installing the CR-338, the total frequency stability
of the transceiver will be improved.
q Remove the bottom cover as shown on the previ-
ous page.
w Remove the 4 screws from the shield cover of the
RF unit, and disconnect P2 (CHASSIS) from J761
(MAIN), then lift up the shield cover.
e Remove the 8 screws from the RF unit, disconnect
J1, J121 and J151, then remove the RF unit.
r Remove the supplied internal crystal and replace
with the CR-338.
t Return the RF unit, J1, J121 and J151 to their orig-
inal positions.
y Connect a frequency counter to the J262, 2LO IN,
then adjust the reference frequency to be
64.00000 MHz with the L1901 on the RF unit.
u Return the J262, shield cover, P2 and bottom cov-
ers to their original positions.
Shield cover
RF unit
J761
(MAIN unit)
P2
(CHASSIS)
TUNER
(antenna tuner)
connector
Black belt
Blue
belt
J151
Blue
J1
Black
J121
Red
CR-338
Supplied crystal
Red belt
RF unit
Soldering
points
Connect a frequency counter, then adjust
the frequency to be 64.00000 MHz.
RF unit
J262
2LO IN
L1901
IC-7400.qxd 02.4.2 11:36 Page 90
13
91
MAINTENANCE
2001 NEW
SCAN
■ Troubleshooting
The following chart is designed to help you correct
problems which are not equipment malfunctions.
If you are unable to locate the cause of a problem or
solve it through the use of this chart, contact your near-
est Icom Dealer or Service Center.
PROBLEM POSSIBLE CAUSE SOLUTION REF.
RECEIVE
POWER
TRANSMIT
Power does not come on
when the [POWER] switch
is pushed.
No sounds come out from
the speaker.
Sensitivity is too low, and
only strong signals are au-
dible.
Received audio is unclear
or distorted.
The [ANT] switch does not
function
Transmitting is impossible.
Output power is too low.
No contact possible with
another station.
Transmit signal is unclear
or distorted.
Repeater cannot be ac-
cessed.
Programmed scan does
not stop.
Programmed scan does
not start.
Memory scan does not
start
Select memory scan does
not start
• Power cable is improperly connected.
• Fuse is blown.
• Volume level is too low.
• The squelch is closed.
• The transceiver is in transmitting condition.
• The antenna is not connected properly.
• The antenna for another band is selected.
• The antenna is not properly tuned.
• The attenuator is activated.
• Wrong operating mode is selected.
• PBT function is activated.
• Noise blanker is turned ON when receiving a
strong signal.
• Preamp is activated.
• The noise reduction is activated and the [NR]
control is too far clockwise.
•The antenna switch has not been activated.
•The operating frequency is not set to a ham
band.
• [RF PWR] is set too far counterclockwise
• [MIC GAIN] is set too far counterclockwise
• The antenna for another band is selected.
• The antenna is not properly tuned.
• RIT or ∂TX function is activated.
•Split frequency and/or duplex function are acti-
vated.
• [MIC GAIN] is set too far clockwise
• Split frequency or duplex function is not acti-
vated.
• Programmed subaudible tone frequency is
wrong.
• Squelch is open.
•[RF/SQL] is assigned to RF gain control and
squelch is open.
•The same frequencies have been programmed
in scan edge memory channels P1 and P2.
•2 or more memory channels have not been
programmed.
•2 or more memory channels have not been
designated as select channels.
• Re-connect the DC power cable correctly.
• Check for the cause, then replace the fuse with
the spare one.
(Fuses are installed in the DC power cable and
the internal PA unit.)
• Rotate [AF] clockwise to obtain a suitable lis-
tening level.
• Turn [RF/SQL] to 10 o’clock position to open the
squelch.
• Push [TRANSMIT] to receive or check the
SEND line of an external unit, if desired.
• Re-connect to the antenna connector.
• Select an antenna suitable for the operating fre-
quency.
• Push [TUNER] for 1 sec. to manually tune the
antenna.
•
Push [P.AMP/ATT] for 1 sec. to select “ATT OFF.”
• Select a suitable operating mode.
•Push [PBTC] for 1 sec. to reset the function
• Push [NB] to turn the noise blanker OFF.
•Push [P.AMP/ATT] once or twice to turn the
function OFF.
• Set the [NR] control for maximum readability.
•Set the antenna switch in set mode to “Auto” or
“Manual.”
• Set the frequency to a ham band.
• Rotate [RF PWR] clockwise.
• Set [MIC GAIN] to a suitable position.
•Select an antenna suitable for the operating fre-
quency.
•Push [TUNER] for 1 sec. to manually tune the
antenna.
• Push [RIT] or [∂TX] to turn the function OFF.
•Push [SPLIT] and/or [F2 DUP] (in M1) to turn
the function OFF.
• Set [MIC GAIN] to a suitable position.
• Push [SPLIT] and/or [F2 DUP] (in M1) to turn
the function ON
• Reset the frequency using set mode.
• Set [RF/SQL] to the threshold point.
•Reset [RF/SQL] control assignment and set it to
the threshold point.
•Program different frequencies in scan edge
memory channel P1 and P2.
• Program more than 2 memory channels.
•Designate more than 2 memory channels as se-
lect channels for the scan.
p. 16
p. 92
p. 23
p. 24
p. 25
—
p. 74
pgs. 75,
76
p. 47
p. 23
p. 51
p. 50
p. 47
p. 52
p. 84
p. 19
p. 25
p. 25
p. 74
pgs. 75,
76
pgs. 47,
56
pgs. 44,
58
p. 25
pgs. 44,
58
p. 45
p. 24
pgs. 24,
81
p. 65
p. 62
p. 71
IC-7400.qxd 02.4.2 11:36 Page 91
92
13
MAINTENANCE
■ Fuse replacement
If a fuse blows or the transceiver stops functioning, try
to find the source of the problem, and replace the dam-
aged fuse with a new, rated fuse.
The IC-7400 has 2 types of fuses installed for trans-
ceiver protection.
• DC power cable fuses ................................ FGB 30 A
• Circuitry fuse ................................................FGB 5 A
DD
DC power cable fuse replacement
Refer the figure illustrated at right for the DC power
cable fuse replacement.
DD
Circuitry fuse replacement
The 13.8 V DC from the DC power cable is applied to
all units in the IC-7400, except for the power amplifier,
through the circuitry fuse. This fuse is installed in the
PA unit.
q Remove the top cover as shown on p. 89.
w Remove the 11 screws from the PA shielding plate,
then remove the plate.
e Replace the circuitry fuse as shown in the diagram
at right.
r Replace the PA shielding plate and top cover.
■ Tuning dial brake adjustment
The tension of the tuning dial may be adjusted to suit
your preference.
The brake adjustment screw is located on the right
side of the tuning dial. See the figure at right.
Turn the brake adjustment screw clockwise or counter-
clockwise to obtain a comfortable tension level while
turning the dial continuously and evenly in one direction.
PROBLEM POSSIBLE CAUSE SOLUTION REF.
DISPLAY
The displayed frequency
does not change properly.
• The dial lock function is activated.
• A set mode screen is selected.
• The internal CPU has malfunctioned.
• Push [LOCK/SPCH] to turn the function OFF.
• Push [MENU] several times to exit the set
mode.
• Reset the CPU.
p. 52
—
p. 93
30 A
fuse
Fuse
CAUTION: DISCONNECT the DC power cable
from the transceiver when changing a fuse.
Light
Heavy
IC-7400.qxd 02.4.2 11:36 Page 92
93
13
MAINTENANCE
2001 NEW
■ Resetting the CPU
When first applying power or when the function does
not seem to be operating normally, reset the CPU as
follows:
q Make sure the transceiver power is OFF.
w While pushing [M-CL] and [F-INP], push [POWER]
for 1 sec. to turn power ON.
• The internal CPU is reset.
•The transceiver displays its initial VFO frequency when
resetting is complete.
e Correct the set mode settings after resetting, if de-
sired.
NOTE: Resetting CLEARS all programmed con-
tents in memory channels and returns programmed
values in set mode to default values.
■ Frequency calibration (approximate)
A very accurate frequency counter is required to cali-
brate the frequency of the transceiver. However, a
rough check may be performed by receiving radio sta-
tion WWV, or other standard frequency signals.
CAUTION: Your transceiver has been thoroughly
adjusted and checked at the factory before being
shipped. You should not calibrate frequencies, ex-
cept for special reasons.
q Push [SSB] to select USB mode.
w Push [PBTC] for 1 sec. to clear the PBT settings
and make sure that the RIT/∂TX function is not ac-
tivated.
e Set the frequency to the standard frequency station
minus 1 kHz.
•
When receiving WWV (10.000.00 MHz) as a standard
frequency, set the operating frequency for 9.999.00 MHz.
• Other standard frequencies can also be used.
r Push [MENU] several times to select M1 or M2, if
necessary.
t Push [MENU] for 1 sec. to select the set mode
screen.
y Push [F1 ≤] or [F2 ≥] several times to select the
CAL. Marker item.
u Rotate the tuning dial clockwise to turn the calibra-
tion marker ON.
• Side tone may be heard.
i Adjust [CAL] pot on the rear side of the transceiver
for a zero beat with the received standard signal.
•Zero beat means that two signals are exactly the same
frequency, resulting in a single tone being emitted.
o Rotate the tuning dial counterclockwise to turn the
calibration marker OFF.
!0 Push [MENU] to exit set mode.
CAL.
Marker
5
ON
[SSB][MENU] [PBTC]
[RF/SQL] [AF] [P.AMP/ATT] [CLEAR][RIT]
[CAL]
• Calibration marker item
[POWER] [F-INP] [M-CL]
IC-7400.qxd 02.4.2 11:36 Page 93
14
94
CONTROL COMMAND
2001 NEW
• CI-V connection example
The transceiver can be connected through an optional
CT-17 CI-V LEVEL CONVERTER to a personal computer
equipped with an RS-232C port. The Icom Communi-
cations Interface-V (CI-V) controls the following func-
tions of the transceiver.
Up to 4 Icom CI-V transceivers or transceivers can be
connected to a personal computer equipped with an
RS-232C port. See p. 87 for setting the CI-V condition
using set mode.
• Data format
The CI-V system can be operated using the following
data formats. Data formats differ according to com-
mand numbers. A data area or sub command is added
for some commands.
Controller to IC-7400
FE FE 66 E0 Cn Sc Data area FD
Preamble
code (fixed)
Transceiver’s
default address
Controller’s
default address
Command number
(see the command table)
Sub command number
(see command table)
BCD code data for
frequency or memory
number entry
End of message
code (fixed)
OK message to controller
FE FE E0 66 FB FD
FE FE E0 66 FA FD
Preamble
code (fixed)
Controller’s
default address
Transceiver’s
default address
OK code
(fixed)
End of message
code (fixed)
NG message to controller
NG code
(fixed)
IC-7400 to controller
qwert y u
FE FE E0 66 Cn Sc Data area FD
qwert y u
■ Remote jack (CI-V) information
9–15 V
DC
personal
computer
ct- 17
BC-25
(optional)
IC-7400
mini-plug cable
• Command table
Command Sub command Description
00 — Send frequency data
01 Same as Send mode data
command 06
02 — Read band edge frequencies
03 — Read operating frequency
04 — Read operating mode
05 — Set operating frequency
06 00 Select LSB
01 Select USB
02 Select AM
03 Select CW
04 Select RTTY
05 Select FM
07 Select CW-R
08 Select RTTY-R
07 — Select VFO mode
00 Select VFO A
01 Select VFO B
A0 Equalize VFO A and VFO B
Command Sub command Description
07 B0 Exchange VFO A and VFO B
08 — Select memory mode
0001–0101* Select memory channel
*P1=0100, P2=0101
0102 Select the call channel
09 — Memory write
0A — Memory to VFO
0B — Memory clear
0C — Read offset frequency
0D — Set offset frequency
0E 00 Scan stop
01 Programmed/memory scan start
02 Programmed scan start
03 ∂F scan start
12 Fine programmed scan start
13 Fine ∂F scan start
22 Memory scan start
23 Select memory scan start
IC-7400.qxd 02.4.2 11:36 Page 94
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14
CONTROL COMMAND
2001 NEW 2001 NEW
• Command table (continued)
Command Sub command Description
0E A1–A7 Set ∂F scan span (A1=±5 kHz,
A2=±10 kHz, A3=±20 kHz,
A4=±50 kHz, A5=±100 kHz,
A6=±500 kHz, A7=±1 MHz)
B0 Set as non-select channel
B1 Set as select channel
D0 Set scan resume OFF
D3 Set scan resume ON
0F 00 Turn the split function OFF
01 Turn the split function ON
10 Select simplex operation
11 Select –DUP operation
12 Select +DUP operation
10 00 Select 10 Hz (1 Hz) tuning step
01 Select 100 Hz tuning step
02 Select 1 kHz tuning step
03 Select 5 kHz tuning step
04 Select 9 kHz tuning step
05 Select 10 kHz tuning step
06 Select 12.5 kHz tuning step
07 Select 20 kHz tuning step
08 Select 25 kHz tuning step
11 — Select/read attenuator (0=OFF,
1=ON)
12 — Select/read antenna selection
(0=ANT1, 1=ANT2)
13 00 Announce with voice synthesizer
01 (00=all data; 01=frequency and
02 S-meter level; 02=receive mode)
14 01 + Level data [AF] level setting (0=max. CCW to
255=max. CW)
02 + Level data [RF] level setting (0=max. CCW to
255=11 o’clock)
03 + Level data [SQL] level setting (0=11 o’clock to
255=max. CW)
06 + Level data [NR] level setting (0=min. to
255=max.)
07 + Level data Inside [TWIN PBT] setting or IF
shift setting (0=max. CCW,
128=center, 255=max. CW)
08 + Level data Outside [TWIN PBT] setting
(0=max. CCW, 128=center,
255=max. CW)
09 + Level data [CW PITCH] setting (0=300 Hz,
128=600 Hz, 255=900 Hz)
0A + Level data [RF PWR] setting (0=mini. to
255=max.)
0B + Level data [MIC GAIN] setting (0=mini. to
255=max.)
0C + Level data [KEY SPEED] setting (0=slow to
255=fast)
0D + Level data [NOTCH] setting (0=low freq. to
255=high freq.)
0E + Level data COMP Level Delay setting (0=0 to
10=10)
0F + Level data Break-IN DELAY setting (20=2.0d
to 130=13.0d)
15 01 Read squelch condition
02 Read S-meter level
11 Read RF power meter
12 Read SWR meter
13 Read ALC meter
16 02 Preamp (0=OFF; 1=preamp 1;
2=preamp 2)
Command Sub command Description
16 12 AGC selection (0=OFF; 1=Slow;
2=Mid; 3=Fast)
22 Noise blanker (0=OFF; 1=ON)
40 Noise reduction (0=OFF; 1=ON)
41 Auto notch (0=OFF; 1=ON)
42 Repeater tone (0=OFF; 1=ON)
43 Tone squelch (0=OFF; 1=ON)
44
Speech compressor (0=OFF; 1=ON)
45 Monitor (0=OFF; 1=ON)
46 VOX function (0=OFF; 1=ON)
47 Break-in (0=OFF; 1=semi break-
in; 2=full break-in)
48 Manual notch (0=OFF; 1=ON)
49 RTTY filter (0=OFF; 1=ON)
4B DTCS (0=OFF; 1=ON)
4C VSC (0=OFF; 1=ON)
19 00 Read the transceiver ID
1A 00 Send/read memory contents (see
p. 97 for details)
01 Send/read band stacking register
contents (see p. 97 for details)
02 Send/read memory keyer con-
tents (see p. 97 for details)
03 Send/read the selected filter width
(0=50 Hz to 40/31=3600/2700 Hz)
04 Send/read the selected AGC time
constant (0=OFF, 1=0.1/0.3 sec. to
13=6.0/8.0 sec.)
0501 Send/read LCD contrast (0=0% to
255=100%)
0502 Send/read LCD backlight (0=0% to
255=100%)
0503 Send/read beep gain (0=min. to
255=max.)
0504 Send/read beep gain limit (0=OFF,
1=ON)
0505 Send/read calibration marker
(0=OFF, 1=ON)
0506 Send/read confirmation beep
(0=OFF, 1=ON)
0507 Send/read band edge beep
(0=OFF, 1=ON)
0508 Send/read RF/SQL control set
(0=Auto, 1=SQL, 2=RF+SQL)
0509 Send/read meter peak hold set
(0=OFF, 1=ON)
0510 Send/read COMP meter set
(0=OFF, 1=ON)
0511 Send/read quick split set (0=OFF,
1=ON)
0512 Send/read split offset –9.999 to
+9.999 MHz (see p. 98 for details)
0513 Send/read split lock set (0=OFF,
1=ON)
0514 Send/read duplex offset 0.000 to
9.999 MHz for HF (see p. 98 for
details)
0515 Send/read duplex offset 0.000 to
9.999 MHz for 50 MHz band (see
p. 98 for details)
0516 Send/read duplex offset 0.000 to
9.999 MHz for 144 MHz band
(see p. 98 for details)
IC-7400.qxd 02.4.2 11:36 Page 95
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14
CONTROL COMMAND
2001 NEW
• Command table (continued)
Command Sub command Description
1A 0548 Send/read FM TX Tone (Treble)
level (0=–5 to 10=+5)
0549 Send/read FM RX Tone (Bass)
level (0 =–5 to 10=+5)
0550 Send/read FM RX Tone (Treble)
level (0=–5 to 10=+5)
0551 Send/read contact number style
(0=Normal, 1=190→ANO,
2=190→ANT, 3=90→NO,
4=90→NT)
0552 Send/read count up trigger chan-
nel (1=M1, 2=M2, 3=M3, 4=M4)
0553 Send/read present number
(1–9999)
0554 Send/read CW side tone gain
(0=min. to 255=max.)
0555 Send/read CW side tone gain limit
(0=OFF, 1=ON)
0556 Send/read CW keyer repeat time
(1=1 sec. to 60=60 sec.)
0557 Send/read CW keyer dot/dash
ratio (28=1:1:2.8 to 45=1:1:4.5)
0558 Send/read rise time (0=2 msec.,
1=4 msec., 2=6 msec., 3=8 msec.)
0559 Send/read paddle polarity
(0=Normal, 1=Reverse)
0560 Send/read keyer type (0=Straight,
1=Bug-key, 2=ELEC-Key)
0561 Send/read mic. up/down keyer set
(0=OFF, 1=ON)
0562 Send/read RTTY filter bandwidth
(0=250 Hz, 1=300 Hz, 2=350 Hz,
3=500 Hz, 4=1 kHz)
0563 Send/read twin peak filter (0=OFF,
1=ON)
0564 Send/read RTTY mark frequency
(0=1275 Hz, 1=1615 Hz,
2=2125 Hz)
0565 Send/read RTTY shift width
(0=170 Hz, 1=200 Hz, 2=425 Hz)
0566 Send/read RTTY keying polarity
(0=Normal, 1=Reverse)
0567 Send/read RTTY decode USOS
(0=OFF, 1=ON)
0568 Send/read RTTY decode new line
code (0=CR,LF,CR+LF, 1=CR+LF)
0569 Send/read number of RTTY de-
coder line (0=2 lines, 1=3 lines)
0570 Send/read scan speed (0=Low,
1=High)
0571 Send/read scan resume (0=OFF,
1=ON)
0572 Send/read NB level (0=0% to
255=100%)
0573 Send/read VOX gain (0=0% to
255=100%)
0574 Send/read anti VOX gain (0=0% to
255=100%)
0575 Send/read VOX delay (0=0.0 sec.
to 20=2.0 sec.)
0576 Send/read Break-IN delay set
(20=2.0d to 130=13.0d)
Command Sub command Description
1A 0517 Send/read one touch repeater set
(0=DUP–, 1=DUP+)
0518 Send/read auto repeater set
(0=OFF, 1=ON-1, 2=ON-2)
0519 Send/read tuner auto start set
(0=OFF, 1=ON)
0520 Send/read PTT tune set (0=OFF,
1=ON)
0521 Send/read 9600 bps mode set
(0=OFF, 1=ON)
0522 Send/read antenna selection
(0=OFF, 1=Manual, 2=Auto)
0523 Send/read speech language
(0=English, 1=Japanese)
0524 Send/read speech speed (0=Slow,
1=Fast)
0525 Send/read S-level speech (0=OFF,
1=ON)
0526 Send/read memo pad numbers
(0=5 ch, 1=10 ch)
0527 Send/read main dial auto TS
(0=OFF, 1=Low, 2=High)
0528 Send/read mic. up/down speed
(0=Low, 1=High)
0529 Send/read quick RIT/∂TX clear
function (0=OFF, 1=ON)
0530 Send/read PBT shifting value
popup set (0=OFF, 1=ON)
0531 Send/read IF filter width popup
set (0=OFF, 1=ON)
0532 Send/read SSB/CW synchronous
tuning function (0=OFF, 1=ON)
0533 Send/read CW normal side set
(0=LSB, 1=USB)
0534 Send/read keyer 1st menu set
(0=Keyer-root, 1=Keyer-send)
0535 Send/read external keypad set
(0=OFF, 1=Keyer send)
0536 Send/read CI-V transceive set
(0=OFF, 1=ON)
0537 Send/read CI-V 731 mode set
(0=OFF, 1=ON)
0538 Send/read speech compressor
level set (0=0 to 10=10)
0539 Send/read SSB TX Tone (Bass)
level (0 =–5 to 10=+5)
0540 Send/read SSB TX Tone (Treble)
level (0=–5 to 10=+5)
0541 Send/read SSB RX Tone (Bass)
level (0 =–5 to 10=+5)
0542 Send/read SSB RX Tone (Treble)
level (0=–5 to 10=+5)
0543 Send/read AM TX Tone (Bass)
level (0 =–5 to 10=+5)
0544 Send/read AM TX Tone (Treble)
level (0=–5 to 10=+5)
0545 Send/read AM RX Tone (Bass)
level (0 =–5 to 10=+5)
0546 Send/read AM RX Tone (Treble)
level (0=–5 to 10=+5)
0547 Send/read FM TX Tone (Bass)
level (0 =–5 to 10=+5)
IC-7400.qxd 02.4.2 11:36 Page 96
97
14
CONTROL COMMAND
2001 NEW 2001 NEW
• Command table (continued)
DD
To send/read memory contents
When sending or reading memory contents, additional code
as follows must be added to appoint the memory channel.
➥ Additional code: 0000–0102
(0100=P1, 0101=P2, 0102=Call)
DD
Band stacking register
To send or read the desired band stacking register’s con-
tents, combined code of the frequency band and register
codes as follows are used.
For example, when sending/reading the oldest contents in
the 21 MHz band, the code “0703” is used.
• Frequency band code
• Register code
DD
Codes for memory keyer contents
To send or read the desired memory keyer contents, the
channel and character codes as follows are used.
• Channel code
• Character’s code
DD
Codes for memory name contents
To send or read the desired memory name settings, the char-
acter codes, instructed codes for memory keyer contents as
above, and follows are additionally used.
• Character’s code— Alphabetical characters
• Character’s code— Symbols
Character ASCII code Character ASCII code
a–z61–7A ——
Code Frequency band Frequency range (unit: MHz)
01 1.8 1.800000– 1.999999
02 3.5 3.400000– 4.099999
03 7 6.900000– 7.499999
04 10 9.900000–10.499999
05 14 13.900000–14.499999
06 18 17.900000–18.499999
07 21 20.900000–21.499999
08 24 24.400000–25.099999
09 28 28.000000–29.999999
10 50 50.000000–54.000000
11 144 144.000000–148.000000
12 GENE Other than above
Code Registered number
01 1 (latest)
02 2
03 3 (oldest)
Character ASCII code Description
0–930–39 Numerals
A–Z41–5A Alphabetical characters
space 20 Word space
/ 2F Symbol
? 3F Symbol
, 2C Symbol
. 2E Symbol
^ 5E e.g., to send
BT
, enter ^4254
✱ 2A Inserts contact number (can be
used for 1 channel only)
Code Channel number
01 M1
02 M2
03 M3
04 M4
Command Sub command Description
1A 0577 Send/read MONITOR level (0=0%
to 255=100%)
06 Send/read DATA mode (0=OFF,
1=ON)
07 Send/read SSB transmit band-
width (0=WIDE, 1=MID, 2=NAR)
08 Send/read DSP filter shape
(0= sharp, 1= soft)
1B 00 Set/read repeater tone frequency
(see p. 98 for details)
01 Set/read TSQL tone frequency
(see p. 98 for details)
02 Set/read DTCS code and polarity
(see p. 98 for details)
1C 00 Set/read the transceiver’s condi-
tion (0=Rx; 1=Tx)
01 Set/read antenna tuner condition
(0=OFF, 1=ON, 2=Start tuning or
while tuning)
Character ASCII code Character ASCII code
!21#23
$24%25
&26¥ 5C
?3F ” 22
’ 27 ` 60
+2B– 2D
:3A;3B
=3D<3C
>3E ( 28
)29[5B
]5D{7B
}7D|7C
_5F
–
7E
IC-7400.qxd 02.4.2 11:36 Page 97
98
14
CONTROL COMMAND
2001 NEW
DD
Split/Duplex frequency setting
The following data sequence is used when sending/reading
the split or duplex frequency setting.
DD
Repeater tone/tone squelch frequency setting
The following data sequence is used when sending/reading
the DTCS code and polarity setting.
DD
DTCS code and polarity setting
The following data sequence is used when sending/reading
the DTCS code and polarity setting.
Fixed digit: 0
1st digit: 0–7
2nd digit: 0–7
3rd digit: 0–7
Transmit polarity:
0= Normal
1= Reverse
Receive polarity:
0= Normal
1= Reverse
q
XX0XX
we
X
100Hz digit: 0–2
10 Hz digit: 0–9
1 Hz digit: 0–9
0.1 Hz digit: 0–9
Fixed digit: 0*
Fixed digit: 0*
q*
00XXX
we
X
*Not necessary when setting a frequency.
1 kHz digit: 0—9
100 Hz digit: 0 (fixed)
100 kHz digit: 0—9
10 kHz digit: 0—9
10 MHz digit: 0 (fixed)
1 MHz digit: 0—4
Direction:
00=+ direction
01=— direction
q
0XXXXXX
we
0
r*
*No need to enter for duplex frequency setting.
IC-7400.qxd 02.4.2 11:36 Page 98
15
99
SPECIFICATIONS
2001 NEW
• General
• Frequency coverage : (Unit: MHz)
Receive 0.030– 60.000000*
1
*
2
144.000– 146.000000
Transmit 1.800– 1.999999*
2
3.500– 3.999999*
2
7.000– 7.300000*
2
10.100– 10.150000*
2
14.000– 14.350000*
2
18.068– 18.168000*
2
21.000– 21.450000*
2
24.890– 24.990000*
2
28.000– 29.700000*
2
50.000– 54.000000*
2
144.000– 146.000000
*
1
Some frequency ranges are not guaranteed.
*
2
Depending on version.
• Mode : USB, LSB, CW, RTTY, AM, FM
• No. of memory ch. : 102
(99 regular, 2 scan edges and 1
call)
• Antenna connector : SO-239×3 (2 for HF/50 MHz and 1
for 144 MHz; 50 Ω)
• Operating temp. range : –10˚C to +60˚C ; +14˚F to +140˚F
• Frequency stability : Less than ±7 ppm from 1 min. to
60 min. after power ON. After
that, rate of stability is less than
±1 ppm/hr. at 25˚C
(+77˚F).
Temperature fluctuations 0˚C to
+50˚C
(+20˚F to +122˚F) less than
±5 ppm.
• Frequency resolution : 1 Hz
• Power supply : 13.8 V DC ±15%
(negative ground)
• Power consumption :
Transmit Max. power 23.0 A
Receive Standby 2.2 A
Max. audio 3.0 A
• Dimensions : 287(W)×120(H)×316.5(D) mm
(projections not incl.)
13
5
⁄
16
(W)×4
23
⁄
32
(H)×12
15
⁄
32
(D) in
• Weight (approx.) : 9.0 kg; 19 lb 13 oz
• ACC 1 connector : 8-pin DIN connector
• ACC 2 connector : 7-pin DIN connector
• DATA connector : Mini DIN 6-pin
• CI-V connector : 2-conductor 3.5 (d) mm (
1
⁄8″)
• Transmitter
•Output power (continuously adjustable):
SSB/CW/RTTY/FM Less than 5 to 100 W
AM Less than 5 to 40 W
• Modulation system :
SSB PSN modulation
AM Low power modulation
FM Phase modulation
• Spurious emission : 50 dB
(HF bands)
60 dB (50/144 MHz)
• Carrier suppression : 40 dB
•Unwanted sideband : 55dB
suppression
• ∂TX variable range : ±9.99 kHz
• Mic. connector : 8-pin connector (600 Ω)
•
ELEC-KEY connector
:
3-conductor 6.35(d) mm
(
1
⁄4″)
• KEY connector :
3-conductor 6.35(d) mm
(
1
⁄4″)
• SEND connector : Phono
(RCA)
• ALC connector : Phono (RCA)
• Receiver
• Receive system : Triple conversion
superheterodyne system
• Intermediate frequencies:
1st 64.455 MHz
2nd 455 kHz
3rd 36 kHz
• Sensitivity
(typical) :
SSB, CW, RTTY 0.16 µV*
1
(1.80–29.99 MHz)
(10 dB S/N) 0.13 µV*
2
(50 MHz)
0.11 µV*
3
(144 MHz)
AM (10 dB S/N) 13 µV (0.5–1.799 MHz)
2 µV*
1
(1.80–29.99 MHz)
1 µV (50*
2
/144*
3
MHz)
FM (12 dB SINAD) 0.5 µV*
1
(28.0–29.99 MHz)
0.25 µV*
2
(50 MHz)
0.18 µV*
3
(144 MHz)
*
1
Pre-amp 1 is ON, *
2
Pre-amp 2 is ON, *
3
Pre-amp is ON
• Squelch sensitivity (Pre-amp: OFF)
:
SSB, CW, RTTY Less than 5.6 µV
FM Less than 1.0 µV
• Selectivity :
SSB
(BW: 2.4 kHz) More than 2.4 kHz/–6 dB
Less than 3.6 kHz/–60 dB
CW
(BW: 500 Hz) More than 500 Hz/–6 dB
Less than 700 Hz/–60 dB
RTTY
(BW: 350 Hz)
More than 360 Hz/–6 dB
Less than 650 Hz/–60 dB
AM
(BW: 6 kHz) More than 6.0 kHz/–6 dB
Less than 15.0 kHz/–60 dB
FM
(BW: 15 kHz) More than 12.0 kHz/–6 dB
Less than 20.0 kHz/–60 dB
• Spurious and image rejection ratio:
HF/50 MHz More than 70 dB
(except IF through
on 50 MHz band)
144 MHz More than 60 dB
• AF output power : More than 2.0 W at 10% distortion
(at 13.8 V DC) with an 8 Ω load
• RIT variable range : ±9.99 kHz
• PHONES connector : 3-conductor 6.35 (d) mm (
1
⁄4″)
• Ext. SP connector : 2-conductor 3.5 (d) mm (
1
⁄8″)/8 Ω
• Antenna tuner
• Matching impedance range:
HF bands 16.7 to 150 Ω unbalanced
(Less than VSWR 3:1)
50 MHz band 20 to 125 Ω unbalanced
(Less than VSWR 2.5:1)
• Minimum operating input power
:8 W
(HF bands)
15 W
(50 MHz band)
• Tuning accuracy : VSWR 1.5:1 or less
• Insertion loss : Less than 1.0 dB
(after tuning)
All stated specifications are typical and subject to change without no-
tice or obligation.
IC-7400.qxd 02.4.2 11:36 Page 99
16
100
OPTIONS
2001 NEW
IC-PW1
HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER
Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has
automatic tuning and band selection capability. Full break-in (QSK) oper-
ation is possible. The amplifier/power supply unit and the remote control
unit are separated.
AH-4
HF/50 MHz AUTOMATIC
ANTENNA TUNER
Specially designed to tune a long
wire antenna for portable or mobile
HF operation. The PTT tuner start
function provides simple operation.
• Input power rating: 120 W
AH-2b
ANTENNA ELEMENT
A 2.5 m long an-
tenna element for
mobile operation
with the AH-4.
•Frequency
coverage:
7–54 MHz bands
with the AH-4
SM-20
DESKTOP MICROPHONE
Unidirectional, electret microphone
for base station operation. Includes
[UP]/[DOWN] switches and a low
cut function.
SP-21
EXTERNAL SPEAKER
Designed for base station opera-
tion.
• Input impedance: 8 Ω
• Max. input power: 5 W
CT-17
CI
-
V LEVEL CONVERTER
For remote transceiver control
using a personal computer. You
can change frequencies, operating
mode, memory channels, etc.
UT-102
VOICE SYNTHESIZER UNIT
Announces the receive frequency, mode
and S-meter level in a clear, electroni-
cally-generated voice, in English (or
Japanese).
SP-20
EXTERNAL SPEAKER
4 audio filters; headphone jack; can con-
nect to 2 transceivers.
• Input impedance: 8 Ω
• Max. input power: 5 W
CR-338
HIGH STABILITY CRYSTAL UNIT
Contains a temperature-compensating
oven heater and crystal unit for improved
frequency stability.
• Frequency stability: ±0.5 ppm
HM-36
HAND MICROPHONE
Hand microphone equipped with
[UP]/[DOWN] switches.
PS-125
DC POWER SUPPLY
Light weight switching regulator
system power supply.
• Output voltage: 13.8 V DC
• Max. current drain: 25 A
•About DC power supply
The use of IC-7400 (#03, #04, #05, #08, #09) in combina-
tion with the DC power supply complies with European Har-
monised Standard regulations under the conditions listed
below.
Conditions
•In combination with PS-125
•
About IC-PW1
LINEAR AMPLIFIER
The IC-PW1
LINEAR AMPLIFIER
does not comply with Euro-
pean Harmonised Standard regulations. Please do not use
this equipment within European countries.
IC-7400.qxd 02.4.2 11:36 Page 100
17
101
ABOUT CE
2001 NEW
INSTALLATION NOTES
For amateur base station installations it is recom-
mended that the forwards clearance in front of the an-
tenna array is calculated relative to the EIRP (Effective
Isotropic Radiated Power). The clearance height below
the antenna array can be determined in most cases
from the RF power at the antenna input terminals.
As different exposure limits have been recommended
for different frequencies, a relative table shows a
guideline for installation considerations.
Below 30 MHz, the recommended limits are specified
in terms of V/m or A/m fields as they are likely to fall
within the near-field region. Similarly, the antennae
may be physically short in terms of electrical length
and that the installation will require some antenna
matching device which can create local, high intensity
magnetic fields. Analysis of such MF installations is
best considered in association with published guidance
notes such as the FCC OET Bulletin 65 Edition 97-01
and its annexes relative to amateur transmitter instal-
lations. The EC recommended limits are almost identi-
cal to the FCC specified ‘uncontrolled’ limits and tables
exist that show pre-calculated safe distances for differ-
ent antenna types for different frequency bands. Fur-
ther information can be found at http://www.arrl.org/.
• Typical amateur radio installation
Exposure distance assumes that the predominant ra-
diation pattern is forwards and that radiation vertically
downwards is at unity gain (sidelobe suppression is
equal to main lobe gain). This is true of almost every
gain antenna today. Exposed persons are assumed to
be beneath the antenna array and have a typical
height to 1.8 m.
The figures assume the worst case emission of con-
stant carrier.
For the bands 10 MHz and higher the following power
density limits have been recommended:
10–144 MHz 2 W/sq m
EIRP clearance heights by frequency band
1 Watts 2.1 m
10 Watts 2.8 m
25 Watts 3.4 m
100 Watts 5 m
1000 Watts 12 m
Forward clearance, EIRP by frequency band
100 Watts 2 m
1000 Watts 6.5 m
10,000 Watts 20 m
100,000 Watts 65 m
In all cases any possible risk depends on the transmit-
ter being activated for long periods. (actual recom-
mendation limits are specified as an average during 6
minutes) Normally the transmitter is not active for long
periods of time. Some radio licenses will require that a
timer circuit automatically cuts the transmitter after 1–2
minutes etc.
Similarly some types of transmitter, SSB, CW, AM etc.
have a lower ‘average’ output power and the assessed
risk is even lower.
Versions of the IC-7400 which display the
“CE” symbol on the serial number seal,
comply with the essential requirements of
the European Radio and Telecommunication
Terminal Directive 1999/5/EC.
This warning symbol indicates that this
equipment operates in non-harmonised fre-
quency bands and/or may be subject to li-
censing conditions in the country of use. Be
sure to check that you have the correct ver-
sion of this radio or the correct programming
of this radio, to comply with national licens-
ing requirement.
IC-7400.qxd 02.4.2 11:36 Page 101
102
17
ABOUT CE
DECLARATION
OF CONFORMITY
We Icom Inc. Japan
1-1-32, Kamiminami, Hirano-ku
Osaka 547-0003, Japan
Kind of equipment: HF/
VHF ALL MODE TRANSCEIVER
This compliance is based on conformity according to Annex III of the
directive 1999/5/EC using the following harmonised standards:
i) Article 3.1a EN 60950 + A11
ii) Article 3.1b EN 301489-1 and EN 301489-15 (or ETS 300 684)
iii) Article 3.2 EN 301 783-2
iv)
v)
Type-designation: i7400
Declare on our sole responsibility that this equipment complies with the
essential requirements of the Radio and Telecommunications Terminal
Equipment Directive, 1999/5/EC, and that any applicable Essential Test
Suite measurements have been performed.
Version (where applicable):
Signature
T. Maebayashi
General Manager
Authorized representative name
Icom (Europe) GmbH
Himmelgeister straße 100
D-40225 Düsseldorf
Place and date of issue
Düsseldorf 25th Jan. 2002
•Version and frequency coverage
Europe (#03)
Receive
0.500– 29.999 MHz
50.000– 54.000 MHz
144.000–146.000 MHz
Transmit
1.800– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 52.000 MHz
144.000–146.000 MHz
Italy (#08)
Receive
1.830– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 51.000 MHz
144.000–146.000 MHz
Transmit
1.830– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 51.000 MHz
144.000–146.000 MHz
France (#04)
Receive
1.810– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.200– 51.200 MHz
144.000–146.000 MHz
Transmit
1.810– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.200– 51.200 MHz
144.000–146.000 MHz
Spain (#09)
Receive
1.830– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 50.200 MHz
144.000–146.000 MHz
Transmit
1.830– 1.850 MHz
3.500– 3.800 MHz
7.000– 7.100 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 50.200 MHz
144.000–146.000 MHz
Denmark (#05)
Receive
0.500– 29.999 MHz
50.000– 54.000 MHz
144.000–146.000 MHz
Transmit
1.800– 1.999 MHz
3.500– 3.999 MHz
7.000– 7.300 MHz
10.100– 10.150 MHz
14.000– 14.350 MHz
18.068– 18.168 MHz
21.000– 21.450 MHz
24.890– 24.990 MHz
28.000– 29.700 MHz
50.000– 52.000 MHz
144.000–146.000 MHz
IC-7400.qxd 02.4.2 11:36 Page 102
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan
A-6086H-1EX-q
Printed in Japan
© 2002 Icom Inc.
2001 NEW
<Intended Country of Use>
■ GER ■ NED ■■ ITA ■ AUT
■■ BEL ■■ GRE ■ GBR ■ LUX
■ SWE ■ IRL ■■ ESP ■■ DEN
■■ FRA ■■ POR ■ FIN ■■ SUI
IC-7400
#03 (Europe)
<Intended Country of Use>
■■ GER ■■ NED ■■ ITA ■■ AUT
■■ BEL ■■ GRE ■■ GBR ■■ LUX
■■ SWE ■■ IRL ■■ ESP ■■ DEN
■ FRA ■■ POR ■■ FIN ■■ SUI
IC-7400
#04 (France)
<Intended Country of Use>
■■ GER ■■ NED ■■ ITA ■■ AUT
■■ BEL ■■ GRE ■■ GBR ■■ LUX
■■ SWE ■■ IRL ■■ ESP ■ DEN
■■ FRA ■■ POR ■■ FIN ■■ SUI
IC-7400
#05 (Denmark)
<Intended Country of Use>
■■ GER ■■ NED ■ ITA ■■ AUT
■■ BEL ■■ GRE ■■ GBR ■■ LUX
■■ SWE ■■ IRL ■■ ESP ■■ DEN
■■ FRA ■■ POR ■■ FIN ■■ SUI
IC-7400
#08 (Italy)
<Intended Country of Use>
■■ GER ■■ NED ■■ ITA ■■ AUT
■■ BEL ■■ GRE ■■ GBR ■■ LUX
■■ SWE ■■ IRL ■ ESP ■■ DEN
■■ FRA ■ POR ■■ FIN ■■ SUI
IC-7400
#09 (Spain)
IC-7400.qxd 02.4.2 11:36 Page Z
… 116

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