Icom IC-751A Instruction Manual page 32

RIT/ 4TX RIT
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ICJI
4TX
ICJI
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PST
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NOTCH
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(2) AM TRANSMITTING
6 - 6 FM OPERATION
(1)
FM RECEIVING
FIL TER
SWITCH
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□□□□
•SOUELCH FUNCTION
Raises the
saouo;;ONE
threshold level. (
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3) Push the AM SWITCH.
4) Tune in an AM signal with the TUN ING CONTROL using the
meter to peak the signal.
5) Push the FIL TER SWITCH to select the narrow receive selectivity.
FILTER SWITCH
BANDWIDTH
ON {IN) 3kHz
OFF (OUT)
8kHz
NOTE: The PBT CONTROL (passband tuning) has no effect in
the AM mode.
6) Refer to SECTION 10 - 1 for installation instructions for the
optional FL-33 crystal filter.
Transmitting an AM signal is essentially the same as for SSB trans-
mission.
1) Select the transmit mode with either the T/R SWITCH or the
PTT SWITCH on the microphone.
2) Turn the RF POWER CONTROL maximum clockwise or set it to
obtain the desired power output.
3) Set the METER SWITCH to the Po position.
4) Adjust the MIC GAIN CONTROL for a slight indication of the
meter needle while speaking into the microphone in a normal
voice.
NOTE: MIC GAIN CONTROL settings which are too high result
in overmodulation and a distorted signal. Set_ the MIC
GAIN carefully.
5) The speech compressor (COMP SWITCH) should be turned OFF
to prevent overmodulation or distortion.
6) Use the FIL TER SWITCH to select the widest selectivity position.
1) Push the FUNCTION SWITCH, then the FM SWITCH.
2) Set the other switches and controls the same as for SSB recep-
tion.
The PBT CONTROL, NOTCH SWITCH and CONTROL, NOISE
BLANKER SWITCH and CONTROL, AGC SWITCH and
FIL TER SWITCH do not function in this mode.
3) When tuning an FM signal, tune for maximum signal strength as
indicated on the meter with the clearest audio.
SOUELCH: If closed, the squelch mutes all noise from the
speaker when no signal is received. This is useful
while waiting for another station to call.
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