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Set DCS Privacy Codes
To select a DCS privacy code:
1. After selecting a channel, press the Mode/Power
button until the DCS icon appears and the small
numbers flash on the display (00 through 83).
2. Press using the Channel Up or Channel Down button
to select a DCS privacy code. You can hold the Up or
Down button for fast advance.
3. When DCS privacy code is displayed, choose one of
the following:
a. Press the Mode/Power button to enter the new
setting and proceed to other functions.
b. Press the Talk or Call/Lock button to enter the
new setting and return to Standby mode.
c. Do not press any buttons for 6 seconds to enter the
new settings and to return to Standby mode.
Set CTCSS Privacy Codes
To select a CTCSS privacy code:
1. After selecting a channel, press the Mode/Power
button until the CTCSS icon appears and the small
numbers next to the channel number flash on
the display.
2. Press using the Channel Up or Channel Down button
to select a privacy code. You can hold the Up or
Down button for fast advance.
3. When your desired CTCSS privacy code is displayed,
choose one of the following:
a. Press the Mode/Power button to enter the new
setting and proceed to other functions.
b. Press the Talk or Call/Lock button to enter the
new setting and return to Standby mode.
c. Do not press any buttons for 6 seconds to enter the
new setting and return to Standby mode.
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To turn maximum range extender on:
– Press and hold the Max Range Hi/Lo button for at
least two seconds until you hear audio from the
speaker which indicates the maximum range
extender is on.
To turn maximum range extender off:
– Press and release the Max Range Hi/Lo button for 2
seconds or change channels.
Lock Function
The Lock function locks the Channel Up, Channel
Down, MEM/ESC, Scan, Volume Up, Volume Down
Weather and Mode/Power buttons to prevent
accidental operation.
To turn the lock on or off:
– Press and hold the Call/Lock button for three seconds.
A single beep sound is used to confirm your lock on
or off request. When in Lock mode,
the Lock icon will be displayed.
microTALK® Range
Your range will vary depending on terrain and conditions.
In flat, open country your radio will
operate at maximum range.
Buildings and foliage in the path of the
signal can reduce the range of the radio.
Dense foliage and hilly terrain will further
reduce the range of the radio.
On Channels 8 through 14, your radio
automatically switches to low power, which
will limit the range the radio can communicate.
Staying in touch with your family and friends is convenient
and easy when using your microTALK® radio. Some of the
many uses you will discover include:
Communicating with others while hiking, biking, and working; keeping track
of family and friends at a crowded public event; checking with travel
companions in another car; talking with neighbors; arranging meeting spots
with others while shopping at the mall.
Secure your microTALK® radio while on
the go.
Carrying your microTALK® radio with you is easy
when using the belt clip or optional wrist strap.
The belt clip easily attaches to your belt, purse, or
backpack.
Owner’s Manual
Introduction
Making Life Easier andSafer
Operation
Using Your Radio
Customer Assistance
Product Service & Support
Belt Clip
Backlit LCD Display
PrintedinChina
Part No. 814-AC6451-101
English
TWO-WAY RADIOMODEL
ACXT645
Nothing Comes Close to aCobra®A-1 A-2 A-3 1 2
Caring for Your microTALK® Radio
Your microTALK® radio will give you years of trouble-free service
if cared for properly. Handle the radio gently. Keep the radio away from
dust. Never put the radio in water or in a damp place. Avoid exposure to
extreme temperatures.
Installing Batteries
To install or replace batteries:
1. Remove belt clip by releasing belt clip
latch and sliding clip up.
2. Using a flat head screw driver or edge of a coin
(a quarter may be used), remove the screw
securing the back battery panel.
3. Insert the supplied three AA rechargeable
batteries or non-rechargeable alkaline batteries.
Position batteries according to polarity markings.
4. Replace battery compartment cover, screw and
belt clip.
• Do not attempt to charge alkaline batteries.
• Do not mix old and new batteries.
• Do not mix alkaline, standard (carbon-zinc), or
rechargeable (Ni-Cd, Ni-MH, etc.) batteries.
To charge batteries in radio:
1. Check to see that the batteries have been
inserted properly.
2. Insert the cable into the charge jack located at
the top of the radio.
3. Plug the cable into USB-compatible power port.
Use only the supplied rechargeable batteries and charger for recharging
your Cobra microTALK® radio.
Cobra recommends your radio is turned off while being charged.
Non-rechargeable alkaline batteries can also be used in your radio.
345678
Battery Low
Two Inches (5 cm)
from Mouth
Battery Low
When battery power is low, the final bar in the
Battery Low icon will blink and an audible tone will
sound twice before the radio shuts off. Your batteries
should be replaced or recharged, if using
rechargeable batteries.
Auto Battery Save
If there are no transmissions within 10 seconds, the
radio will automatically switch to Battery Save mode
and the Power Saver icon will flash in the display.
This will not affect the radio’s ability to receive
incoming transmissions.
Communicating with Another Person
1. Press and hold the Talk button.
2. With the microphone about two inches (5 cm) from
your mouth, speak in a normal voice.
3. Release the Talk button when you are
finished talking and listen for a response.
You cannot receive incoming calls while
pressing the Talk button.
To Select a Channel
With the radio on, select any of the 22 channels by
pressing the Channel Up or Channel Down button.
Both radios must be tuned to the
same channel to communicate.
The radio will display flashing battery icon
while charging if the radio is on.
Both radios must be tuned to the
same channel to communicate.
See page 17 for frequency
allocations charts.
Listening for a Response
Release the Talk button to receive incoming
transmissions. Your microTALK® radio is always in
Standby mode while the Talk or Call buttons are
not pressed.
To Adjust Volume
Press the Volume Up or Volume Down button.
A double beep sound is used to indicate the minimum
and maximum volume levels
(1 through 8).
Call Button
Press and release the Call button.
The other person will hear a two second call tone.
This tone is used only to establish voice
communications.
LED/S.O.S. Flashlight
Press and release the LED ashlight button below the
Talk button to use the LED flashlight located at the
bottom of the radio.
To activate S.O.S. function, press and hold the LED
ashlight button to turn on. Press and release to
turn off the flashlight or S.O.S. function.
Auto Squelch/Maximum Range
Your microTALK® radio will automatically shut off weak transmissions and
unwanted noise due to terrain, conditions or if you’ve reached your
Maximum Range limit.
You can temporarily turn off auto squelch or turn on maximum range
extender, allowing all signals to be received and extending the maximum
range of your radio.
See page 12 on how to select between
ten call tone settings.
Remember, you can achieve maximum
range by using maximum range extender.
See page 4 for details.
Set CTCSS Privacy Codes
Set DCS Privacy Codes
Set Vox On/Off
Set Vox Sensitivity
Set Call Tones 1-10
Set VibrAlert On/Off
Set Roger Beep On/Off
Set Key Tones On/Off
To successfully communicate using a privacy code, both
the sending and receiving radios must be tuned to the same
channel and to the same privacy code system (CTCSS or DCS)
and privacy code number. Each channel will remember the
last privacy code system and number you select.
The privacy code 00 is not a privacy code, but allows all
signals to be heard on a channel that is set to 00 on both
the CTCSS and DCS systems.
Mode Functions (continued on back side)
Maximum range may vary and is based on
unobstructed line-of-sight communication
under ideal conditions.
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1. Antenna
2. External Speaker/
Microphone/ USB Charge Jack
3. Mode/Power Button
4. Call/Lock Button
5. Channel Up/Down Buttons
6. Backlit LCD Display
7. Speaker/Microphone
8. Volume Up/Down Buttons
9. LED Light Button
10. Push-to-Talk Button
11. Memory/Escape Button
12. Max Range Hi/Lo Button
13. Scan Button
14. Wrist Strap Connection
15. Belt Clip
16. Battery Compartment
17. Battery Door Screw
18. Rubberized Grips
19. LED Flashlight
20. Weather Button
1. Battery Level Indicator
2. Roger Beep Icon
3. VOX Icon
4. Weather Icon
5. Lock Icon
6. Hi/Low Power Icon
7. DCS/CTCSS Icons
8. Scan Icon
9. Memory Icon
10. Weather Alert Icon
11. DCS/CTCSS Privacy Code Numbers
12. Power Saver Icon
13. Channel Numbers
14. Receive/Transmit Icon
15. Memory Channel Number
16. VibrAlert® / Call Alert Icon
17. Key Tone Icon Turning on Your microTALK® Radio
Press and hold the Mode/Power button until you hear
a series of audible tones indicating the radio is on.
Your microTALK® radio is now in Standby mode,
ready to receive transmissions. The radio is always in
Standby mode except when the Talk, Call or
Mode/Power buttons are pressed.
Quick Start
1. Press and hold the Mode/Power button to turn on your radio.
2. Press the Channel Up or Channel Down button to select
a channel.
3. Press and hold the Talk button while
speaking into the microphone.
4. When finished talking, release the Talk
button and listen for a response.
Both radios must be tuned to the same
channel/privacy code to communicate.
For charging microTALK® radio(s) in desktop charger:
1. Insert radio(s) into desktop charger as shown.
2. Insert the micro-USB cable into jack on back of charger.
3. Plug the cable into USB-compatible power port. For
pluggable equipment, the socket-outlet shall be
installed near the equipment and shall be easily
accessible.
If charging light is not on, check position of radio. Radio should be upright.
The charge indicator light will stay on as long as the radio is in the charging
well, and the light will go off when the charging is complete.
Note: To charge a single radio, you can bypass the desktop charger and
simply insert the micro-USB’s connector directly into the charge jack located
on the top of the radio.
The radio will display flashing battery icon while charging.
Cobra recommends your radio be turned off while being charged.
Non-rechargeable alkaline batteries can also be used in your radio.
Battery Save Mode
Operation
Mode Functions
If DCS is turned on at the channel
selected, the display will flash the
CTCSS icon and “OFF.” To switch from
DCS to CTCSS, press the Channel Up
or Channel Down button while the display
is flashing “OFF.” The display will then
show the small numbers flashing and you
will then be able to proceed to step 2.
If CTCSS is turned on at the channel selected,
the display will flash the DCS icon and “OFF.”
To switch from CTCSS to DCS, press the
Channel Up or Channel Down button while
the display is flashing “OFF.” The display will
then show the small numbers flashing and
you will then be able to proceed to step 2.
Privacy Code
Remove Screw
Insert Batteries
Radio Charger Jack
Remove Belt Clip
Channel Number
Listening
Volume Level
Lock Icon
Maximum Range
Reduced Range
Reduced Range
Privacy Code
Call Button
Lock Button
Volume Button
Mode/Power
Mode/Power
Light/Max Range
Talk Button
LED/S.O.S. Flashlight
Privacy Codes
Your microTALK® radio incorporates two advanced coded squelch systems
that can help to reduce interference from other users on any given channel.
CTCSS (Continuous Tone Coded Squelch System) provides 38 privacy codes
and DCS (Digitally Coded Squelch) provides 83 privacy codes. This provides
a total of 121 Privacy Codes. Either system can be used on all channels,
but both systems cannot be used on the same channel at the same time.
Scrolling Through the Mode Function
By scrolling through the Mode function, you will be able to select or turn on
preferred features of your microTALK® radio. When scrolling through the
Mode function, your radio features will be displayed in the same
predetermined order:
Introduction
Product Features
Features
22 Channels
10 Channel
Weather Radio
Weather Alert
121 Privacy Codes
(38 CTCSS codes/
83 DCS codes)
Hands-Free Operation
(VOX)
VibrAlert® Silent Paging
Scan
Channels, privacy codes
Backlit LCD Display
LED Flashlight
Call Alert
Ten selectable tones
Button Lock
Speaker/
Microphone/
Charge Jack
Roger Beep
Selectable On/Off
Battery/Power Saver
Keystroke Tones
Battery Level Indicator
Low Battery
Audible Alert
Auto Squelch
Maximum
Range Extender
Belt Clip
Channel Button
Channel Button
Mode/Power
Mode/Power
Channel Button
©2022 Cobra Electronics Corporation
www.cobra.com
In this user’s guide, you should find all the information you need to operate
your microTALK® radio. If you require further assistance after reading this
guide, Cobra offers the following customer assistance services:
For Assistance In The U.S.A.
For any questions about operating or installing this new Cobra product, PLEASE
CONTACT COBRA FIRST… do not return this product to the retail store. The
contact information for Cobra will vary depending on the country in which you
purchased and uses the product. For the latest contact information, please go
to www.cobra.com/support or call 1-800-543-1608.
If your product should require factory service, please go to
www.cobra.com/support and follow the instructions.
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