Icom IC-7600, Инструкция по эксплуатации, Страница: 13 / 196

MF3 (MULTI-FUNCTION 3 SWITCH)
P.AMP SWITCH (P.AMP) (p. 80)
➥
Selects one of 2 receive RF preamps
or bypasses them.
• “P. AMP1” activates a 10 dB preamp.
• “ P. AMP2” activates a 16 dB high-gain
preamp.
• “P. AMP OFF” can also be selected.
➥
Turns the preamp function OFF when
held down for 1 second.
What is the preamp?
✓
The preamp amplifies signals in the front end to
improve the S/N ratio and sensitivity. Select “P. AMP1”
or “P. AMP2” when receiving weak signals.
MF4 (MULTI-FUNCTION 4 SWITCH)
ATT SWITCH (ATT) (p. 80)
➥
Selects a 6 dB, 12 dB or 18 dB
attenuator when pushed.
• “ATT OFF” can also be selected.
➥
Turns the attenuator function OFF
when held down for 1 second.
What is the attenuator?
✓
The attenuator prevents a desired signal from being
distorted when very strong signals are near it, or
when very strong electromagnetic fields, such as from
a broadcasting station, are near your location.
MF5 (MULTI-FUNCTION 5 SWITCH)
AGC SWITCH (AGC) (p. 82)
➥
Activates and selects a fast, middle
or slow AGC time constant when
pushed.
• In the FM mode, only “FAST” is
available.
➥
Selects the AGC set mode when held
down for 1 second.
The AGC time constant can be set
between 0.1 and 8.0 seconds
(depending on the mode)
, or turned
OFF. When the AGC is OFF, the
S-meter does not function.
What is the AGC?
✓
The AGC controls the receiver gain to produce a
constant audio output level, even when the received
signal strength varies dramatically. Select “FAST” for
tuning and then select “MID” or “SLOW,” depending
on the receiving condition.
MF6 (MULTI-FUNCTION 6 SWITCH)
VOX SWITCH (VOX) (p. 92)
➥
Push to turn the VOX function ON
or OFF during the SSB, AM and FM
mode operation.
➥
Hold down for 1 second to select the
VOX set mode.
What is the VOX function?
✓
The VOX function (voice operated transmission)
activates transmission without pushing the transmit
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. 93)
➥
Selects semi break-in, full break-in
operation in the CW mode, or turns
the break-in operation OFF when
pushed.
What is the break-in function?
✓
The break-in function switches transmit and receive
with CW keying. Full break-in function (QSK), you can
monitor the receive signal during keying.
MF7 (MULTI-FUNCTION 7 SWITCH)
COMP SWITCH (COMP) (p. 94)
➥
Turns the speech compressor ON or
OFF in the SSB mode.
➥
Selects the compression between
narrow, mid or wide when held down
for 1 second.
What is the speech compressor?
✓
The speech compressor compresses the transmitter
audio input to increase the average audio output
level, in order to increase talk power. This function is
effective for long-distance communication, or when
propagation conditions are poor.
1 ⁄
4
SWITCH ( 1 ⁄
4
) (p. 33)
➥
Turns the
1
⁄
4
speed tuning function
ON or OFF in the SSB data, CW,
RTTY and PSK modes.
• The
1
⁄
4
function sets the dial speed to
1 ⁄
4
of it’s normal speed for fine tuning.
TONE SWITCH (TONE) (pp. 66, 67)
➥
Switches between the tone encoder,
tone squelch function and no-tone
operation when pushed in the FM
mode.
➥
Selects the tone set mode when held
down for 1 second in
the
FM mode.
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