Multi-Function Switches - Icom IC-756 Instruction Manual

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@® MULTI-FUNCTION SWITCHES
e Push to select the functions indicated in the LCD
display to the right of these switches.
- Functions vary depending on the operating condition.
e Push to input a character for memory keyer pro-
gramming or memory name. (pgs. 36, 45)
e Toggles the antenna connector selection
oe between ANT1/R and ANT2/R when
pushed. (p. 37)
e Toggles the receive antenna ON and OFF
when pushed for 2 sec.
e Selects RF power (Po), SWR or ALC me-
tering during transmit. (p. 34)
Selects one of 2 receive RF preamps or
bypasses them.
Peg -"P.AMP1" activates 10 dB preamp for HF all
bands.
- "P.AMP2" activates 16 dB high-gain preamp
for 21 MHz band and above.
What is the preamp?
The preamp amplifies received signals in the front end cir-
cuit to improve the S/N ratio and sensitivity. Select
"P. AMP 1" or "P. AMP2" when receiving weak signals.
e Selects 6 dB, 12 dB or 18 GB attenuator,
i or bypasses them.
V What is the attenuator?
The attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequency
or when very strong electric fields, such as from a broad-
casting station, are near your location.
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APF AUTO NOTCH
APF -- CW PITCH
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eActivates or selects fast, middle or slow
AGC time constant when pushed.
noc - The setting becomes "fast" in FM mode re-
gardless of this setting.
e Deactivates the AGC circuit when pushed
for 2 sec.
Y NOTE: While "AGC OFF" is selected, the
Y, S-meter does not function.
V What is the AGC?
The AGC controls receiver gain to produce a constant
audio output level even when the received signal strength
is varied by fading, etc. Select "FAST" for tuning and se-
lect "MID" or "SLOW" depending on the receiving condi-
tion.
_ ĦTurns the VOX function ON and OFF
when pushed in non-CW modes. (p. 33)
eEnters the VOX set mode when pushed
for 2 sec. innon-CW modes. (p. 33)
æm °Selects semi break-in, full break-in opera-
tion, or turns the break-in operation OFF
when pushed in CW mode.
V What is the VOX function?
The VOX function (voice operated transmission) starts
transmission without pushing the transmit switch or PTT
switch when you speak into the microphone; then, auto-
matically returns to receive when you stop speaking.
V What is the break-in function?
The break-in function toggles transmit and receive with
CW keying. Full break-in (QSK) can monitor the receive
signal during keying.