1-5
@2 AF CONTROL [AF] (inner control; p. 3-8)
Varies the audio output level of the speaker or
headphones.
@3 BASS RESPONSE CONTROL [BASS]
(outer control; p. 3-9)
Adjusts the bass response of the audio output.
@4 TREBLE RESPONSE CONTROL [TREBLE]
(inner control; p. 3-9)
Adjusts the treble response of the audio output.
@5 MULTIFUNCTION SWITCHES
Push to select the functions indicated in the LCD
display to the right of these switches.
• Functions vary depending on the operating condition.
➥ While operating HF bands, selects the
antenna connector from HF ANT 1, HF
ANT 2 and HF ANT 3 when pushed.
(p. 9-3)
• During 30–1150 MHz operation, only ANT 1
is available.
• During 1150–3335 MHz operation, only ANT
2 is available.
➥ Turns the antenna control voltage ON
and OFF form [ANT SEL] when pushed
and held for 1 sec. (p. 9-3)
➥ Selects one of 2 receive RF preamps or
bypasses them. (p. 5-9)
●
●
HF bands
•“P. AMP1” activates 10 dB preamp.
•“P. AMP2” activates high-gain preamp.
●
●
Above 30 MHz bands
• Only “P. AMP” is available.
✔
What is the preamp?
The preamp amplifies received signals in the front end cir-
cuit to improve S/N ratio and sensitivity. Select “P. AMP1” or
“P. AMP2” when receiving weak signals.
➥ Selects the attenuator when pushed.
(p. 5-9)
• HF bands: 6, 12, 18, 24, 30 dB.
• 30–1150 MHz: 10, 20, 30 dB.
•1150–3335 MHz: 20 dB only.
➥ Turns OFF the attenuator when pushed
and held for 1 sec. (p. 5-9)
✔
What is the attenuator?
The attenuator prevents a desired signal from distorting
when very strong signals are near the receiving frequency,
or when very strong electric fields, such as from a broad-
casting station, are near your location.
➥ Selects one of 3 IF filter settings.
➥ Enters the filter set screen when pushed
and held for 1 sec.
➥ Activates and selects fast, middle or slow
AGC time constant when pushed.
(p. 5-10)
• In FM, WFM or P25 mode, only “FAST” is
available.
• “VR (volume)” indicates that AGC time con-
stant depends on [AGC] control.
➥ Enters the AGC set mode when pushed
and held for 1 sec. (p. 5-10)
AGC time constant can be set from 0.1 to 8.0 sec.
(depends on mode), or turned OFF. When AGC is
“OFF,” the S-meter does not function.
✔
What is the AGC?
The AGC controls receiver gain to produce a constant audio
output level, even when the received signal strength varies
dramatically. Select “FAST” for tuning and then select “MID”
or “SLOW” depending on the receiving conditions.
➥ Switches between the tone squelch,
DTCS squelch function and no-tone op-
eration when pushed in FM mode.
(p. 4-4)
➥ Enters the tone set mode when pushed
and held for 1 sec. in FM, FSK mode.
(pgs. 4-4, 4-12)
➥ Push to toggle the CW pitch setting
screen ON and OFF in CW mode.
(p.4-9)
(Requires optional UT-122)
➥ Switches the digital squelch between
NAC squelch, selective squelch and
OFF in P25 mode. (p. 4-19)
➥ Enters the code set mode when pushed
and held for 1 sec. in P25 mode.
(p. 4-19)
➥ Push to switch the voice squelch control
function ON and OFF; useful for scan-
ning. (p. 8-3)
