#0 MULTI-FUNCTION KEYS
Push to select the functions indicated in the display
to the right of these keys.
• Functions vary, depending on the operating mode.
Push to select the ANT1, ANT2, ANT3 or
ANT4 antenna connector. (p. 13-2)
Hold down for 1 second to display the
antenna selection memory. (p.13-5)
• When the receive antenna is activated, the
antenna that is connected to [ANT4] is used
only for receive.
When a transverter is used, this [ANT]
does not function and “TRV” appears.
Push to select the RF power (Po), SWR,
ALC, COMP, Vd or Id metering while
transmitting. (p. 4-11)
Hold down for 1 second to turn the Digital
multi-function meter ON or OFF. (p. 4-11)
Push to select one of two receive RF
preamps, or bypass them. (p. 7-2)
• “P.AMP1” activates a 10 dB preamp.
• “P.AMP2” activates a 16 dB high-gain pre-
amp.
What is a preamp?
A preamp amplifies received signals in the front end
circuit to improve S/N ratio and sensitivity. Select
“P.AMP1” or “P.AMP2” when receiving weak signals.
Push to select the 6 dB, 12 dB or 18 dB
attenuator. (p. 7-2)
Hold down for 1 second to select the 3
dB, 6 dB, 9 dB, 12 dB, 18 dB, or 21 dB
attenuator. (p. 7-2)
What is an attenuator?
An attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequen-
cy, or when very strong electric fields, such as from a
broadcasting station, are near your location.
Push to activate and then select the
“FAST,” “MID,” or “SLOW” AGC time con-
stant. (p. 7-4)
• In the FM mode, only “FAST” is selectable.
Hold down for 1 second to enter the AGC
set mode. (p. 7-4)
The AGC time constant can be set be-
tween 0.1 to 8.0 second (depending on the
mode)
, or turned OFF. When AGC is
“OFF,” the S-meter does not function.
What is 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 re-
ceiving condition.
Turns the speech compressor ON or
OFF in the SSB mode. (p. 8-6)
Selects the narrow, middle or wide com-
pression when held down for 1 second.
What is a speech compressor?
A speech compressor compresses the transmitter au-
dio input to increase the average audio output level,
and therefore increase the talk power. This function
is effective for long-distance communication, or when
propagation conditions are poor.
Push to turn the
1
⁄4-speed tuning func-
tion ON or OFF in the SSB data, CW,
RTTY and PSK modes. (p. 4-9)
•
1
⁄4 function sets the dial rotation to
1
⁄4 of the
normal speed for fine tuning.
In the FM mode, push to toggle between
the tone encoder, tone squelch function
and no-tone operation. (p. 5-39)
In the FM mode, hold down for 1 second
to enter the Tone set mode. (pp. 5-38,
5-39)
Push to turn the Voice squelch control
function ON or OFF. This is useful for
scanning. (p. 12-10)
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