Icom IC-746 Instruction Manual page 35

q Preamplifier and attenuator (p. 38)
w Noise reduction (p. 39)
e Auto notch filter (p. 40)
ı TRANSMITTING
[TRANSMIT]
[RF PWR] [AM/FM]
[MIC GAIN]
Connect microphone here
q VOX (voice activated transmit) (p. 43)
w Transmit quality monitor (p. 45)
Convenient functions for receive
DSP
DSP
Band keys
Convenient functions for transmit
USING DIFFERENT OPERATING MODES
The preamp amplifies received signals in the front end
circuit to improve the S/N ration and sensitivity. The at-
tenuator prevents a desired signal from distorting
when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from a broadcasting station, are near you.
The noise reduction function reduces noise compo-
nents and picks out desired signals which are buried
in noise. The received AF signals are converted to dig-
ital signals and then the desired signals are separated
from the noise.
The auto notch function automatically attenuates more
than 3 beat tones, tuning signals, etc., even if they are
moving.
Before transmitting, monitor your selected operating
frequency to make sure transmitting won't cause inter-
ference to other stations on the same frequency.
Connect a microphone to the [MIC] connector.
Push a band key to select the desired band.
Push [AM/FM] to select FM.
• Pushing [AM/FM] toggles between AM and FM.
Rotate [AF] to set audio to a comfortable listening
level.
Push [TRANSMIT] or push and hold [PTT] to trans-
mit, then speak into the microphone to transmit.
Push [TRANSMIT] or release [PTT] to return to re-
ceive.
The VOX function starts transmission without pushing
the transmit switch or PTT switch when you speak into
the microphone; then, automatically returns to receive
when you stop speaking.
This function allows you to monitor the quality of your
transmitted signal.
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