Icom IC-7600 Instruction Manual page 7

MF3 (MULTI-FUNCTION 3 SWITCH)
P.AMP SWITCH (P.AMP)
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 im-
prove S/N ratio and sensitivity. Select "P. AMP1" or
"P. AMP2" when receiving weak signals.
MF4 (MULTI-FUNCTION 4 SWITCH)
ATT SWITCH (ATT)
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.
(p. ??)
What is the attenuator?
The attenuator prevents a desired signal from being
distorted when very strong signals are near the de-
sired frequency, or when very strong electromag-
netic fields, such as from a broadcasting station,
are near your location.
MF5 (MULTI-FUNCTION 5 SWITCH)
AGC SWITCH (AGC)
Activates and selects fast, middle or
slow AGC time constant when pushed.
(p. ??)
• 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 between
0.1 to 8.0 sec.
turned OFF. When AGC is "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" depend-
ing on the receiving condition.
(p. ??)
(p. ??)
(p. ??)
(p. ??)
, or
(depends on mode)
PANEL DESCRIPTION
MF6 (MULTI-FUNCTION 6 SWITCH)
VOX SWITCH (VOX)
Push to turn the VOX function ON and
OFF during SSB, AM and FM mode
operation. (p. ??)
Push and hold for 1 sec. to enter VOX
set mode. (p. ??)
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)
Selects semi break-in, full break-in op-
eration, or turns the break-in operation
OFF when pushed in CW mode.
(p. ??)
What is the break-in function?
The break-in function switches transmit and receive
with CW keying. Full break-in function (QSK) can
monitor the receive signal during keying.
MF7 (MULTI-FUNCTION 7 SWITCH)
COMP SWITCH (COMP)
Turns the speech compressor ON and
OFF in SSB mode.
Switches the narrow, middle or wide
compression when pushed and held
for 1 sec.
What is the speech compressor?
The speech compressor compresses the transmit-
ter audio input to increase the average audio output
level, to increase talk power. This function is effec-
tive for long-distance communication or when prop-
agation conditions are poor.
1 ⁄ SWITCH ( 1 ⁄ )
4 4
Turns the 1 ⁄ speed tuning function ON
4
and OFF in SSB data, CW, RTTY and
PSK modes. (p. ??)
• 1 ⁄ function sets dial rotation to
4
mal speed for fine tuning.
TONE SWITCH (TONE)
Switches between the tone encoder,
tone squelch function and no-tone
operation when pushed in FM mode.
(pgs. ??, ??)
Enters the tone set mode when pushed
and held for 1 sec. in FM mode.
(pgs. ??, ??)
1
(p. ??)
1 ⁄ of nor-
4
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