Icom IC-7600 Instruction Manual page 11

MF3 (MULTI-FUNCTION 3 SWITCH)
P.AMP SWITCH (P.AMP) (p. 72)
Selects one of 2 receive RF preamps
or bypasses them.
• "P. AMP1" activates 10 dB preamp.
• " P. AMP2" activates 16 dB high-gain pre-
amp.
• "P. AMP OFF" can also be selected.
Turns the preamp function OFF when
pushed and held for 1 sec.
What is the preamp?
The preamp amplifies signals in the front end to
improve S/N ratio and sensitivity. Select "P. AMP1"
or "P. AMP2" when receiving weak signals.
MF4 (MULTI-FUNCTION 4 SWITCH)
ATT SWITCH (ATT) (p. 72)
Selects 6 dB, 12 dB or 18 dB attenua-
tor when pushed.
• "ATT OFF" can also be selected.
Turns the attenuator function OFF
when pushed and held for 1 sec.
What is the attenuator?
The attenuator prevents a desired signal from
being distorted when very strong signals are near
the desired frequency, or when very strong electro-
magnetic fields, such as from a broadcasting sta-
tion, are near your location.
MF5 (MULTI-FUNCTION 5 SWITCH)
AGC SWITCH (AGC) (p. 74)
Activates and selects fast, middle
or slow AGC time constant when
pushed.
• In FM mode, only "FAST" is available.
Enters the AGC set mode when
pushed and held for 1 sec.
AGC time constant can be set be-
tween 0.1 to 8.0 sec.
, or turned OFF. When AGC is
mode)
"OFF," the S-meter does not function.
What is the AGC?
The AGC controls receiver gain to produce a con-
stant audio output level, even when the received
signal strength varies dramatically. Select "FAST"
for tuning and then select "MID" or "SLOW" de-
pending on the receiving condition.
MF6 (MULTI-FUNCTION 6 SWITCH)
VOX SWITCH (VOX) (p. 84)
What is the VOX function?
The VOX function (voice operated transmission)
activates transmission without pushing the trans-
mit switch or PTT switch when you speak into the
microphone; then automatically returns to receive
when you stop speaking.
BK-IN SWITCH (BK-IN) (p. 85)
What is the break-in function?
The break-in function switches transmit and re-
ceive with CW keying. Full break-in function (QSK)
can monitor the receive signal during keying.
MF7 (MULTI-FUNCTION 7 SWITCH)
COMP SWITCH (COMP) (p. 86)
What is the speech compressor?
The speech compressor compresses the trans-
mitter audio input to increase the average audio
output level, to increase talk power. This function is
effective for long-distance communication or when
propagation conditions are poor.
1 ⁄ SWITCH (
4
(depends on
TONE SWITCH (TONE) (pgs. 62, 63)
PANEL DESCRIPTION
Push to turn the VOX function ON and
OFF during SSB, AM and FM mode
operation.
Push and hold for 1 sec. to enter VOX
set mode.
Selects semi break-in, full break-in
operation, or turns the break-in opera-
tion OFF when pushed in CW mode.
Turns the speech compressor ON and
OFF in SSB mode.
Switches the narrow, middle or wide
compression when pushed and held
for 1 sec.
1 ⁄ ) (p. 30)
4
Turns the 1 ⁄ speed tuning function
4
ON and OFF in SSB data, CW, RTTY
and PSK modes.
• 1 ⁄ function sets dial rotation to
4
normal speed for fine tuning.
Switches between the tone encoder,
tone squelch function and no-tone op-
eration when pushed in FM mode.
E n t e r s t h e t o n e s e t m o d e w h e n
pushed and held for 1 sec. in FM
mode.
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1 ⁄ of
4
17
18
19
20
21
4