Icom IC-7600 Instruction Manual - Page 11

P.amp Switch P.amp, Bk-in Switch Bk-in - preamp 2

Page 11 highlights

1 PANEL DESCRIPTION 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 attenuator 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 electromagnetic fields, such as from a broadcasting station, 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 between 0.1 to 8.0 sec. (depends on mode), or turned OFF. When AGC is "OFF," the S-meter does not function. ✔ What is the AGC? The AGC controls 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. 84) ➥ 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. ✔ 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 1 microphone; then automatically returns to receive when you stop speaking. 2 BK-IN SWITCH (BK-IN) (p. 85) 3 ➥ Selects semi break-in, full break-in operation, or turns the break-in opera- 4 tion OFF when pushed in CW mode. ✔ What is the break-in function? 5 The break-in function switches transmit and receive with CW keying. Full break-in function (QSK) 6 can monitor the receive signal during keying. 7 MF7 (MULTI-FUNCTION 7 SWITCH) COMP SWITCH (COMP) (p. 86) 8 ➥ Turns the speech compressor ON and OFF in SSB mode. 9 ➥ Switches the narrow, middle or wide compression when pushed and held 10 for 1 sec. ✔ What is the speech compressor? 11 The speech compressor compresses the trans- mitter audio input to increase the average audio 12 output level, to increase talk power. This function is effective for long-distance communication or when 13 propagation conditions are poor. 14 1⁄4 SWITCH (1⁄4) (p. 30) ➥ Turns the 1⁄4 speed tuning function 15 ON and OFF in SSB data, CW, RTTY and PSK modes. • 1⁄4 function sets dial rotation to 1⁄4 of 16 normal speed for fine tuning. 17 TONE SWITCH (TONE) (pgs. 62, 63) ➥ Switches between the tone encoder, 18 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 19 pushed and held for 1 sec. in FM mode. 20 21 

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MF3 (MULTI-FUNCTION 3 SWITCH)
P.AMP SWITCH (P.AMP)
(p. 72)
Selects one of 2 rece±ve RF preamps
or bypasses them.
• “P. AMP1” act±vates 10 dB preamp.
• “P. AMP2” act±vates 16 dB h±gh-ga±n pre-
amp.
• “P. AMP OFF” can also be selected.
Turns the preamp funct±on OFF when
pushed and held for 1 sec.
What is the preamp?
The preamp ampl±f±es s±gnals ±n the front end to
±mprove S/N rat±o and sens±t±v±ty. Select “P. AMP1”
or “P. AMP2” when rece±v±ng weak s±gnals.
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 funct±on OFF
when pushed and held for 1 sec.
What is the attenuator?
The attenuator prevents a des±red s±gnal from
be±ng d±storted when very strong s±gnals are near
the des±red frequency, or when very strong electro-
magnet±c f±elds, such as from a broadcast±ng sta-
t±on, are near your locat±on.
MF5 (MULTI-FUNCTION 5 SWITCH)
AGC SWITCH (AGC)
(p. 74)
Act±vates and selects fast, m±ddle
or slow AGC t±me constant when
pushed.
In FM mode, only “FAST” ±s ava±lable.
Enters the AGC set mode when
pushed and held for 1 sec.
AGC t±me constant can be set be-
tween 0.1 to 8.0 sec.
(depends on
mode)
, or turned OFF. When AGC ±s
“OFF,” the S-meter does not funct±on.
What is the AGC?
The AGC controls rece±ver ga±n to produce a con-
stant aud±o output level, even when the rece±ved
s±gnal strength var±es dramat±cally. Select “FAST”
for tun±ng and then select “MID” or “SLOW” de-
pend±ng on the rece±v±ng cond±t±on.
MF6 (MULTI-FUNCTION 6 SWITCH)
VOX SWITCH (VOX)
(p. 84)
Push to turn the VOX funct±on ON and
OFF dur±ng SSB, AM and FM mode
operat±on.
Push and hold for 1 sec. to enter VOX
set mode.
What is the VOX function?
The VOX funct±on (vo±ce operated transm±ss±on)
act±vates transm±ss±on w±thout push±ng the trans-
m±t sw±tch or PTT sw±tch when you speak ±nto the
m±crophone; then automat±cally returns to rece±ve
when you stop speak±ng.
BK-IN SWITCH (BK-IN)
(p. 85)
Selects sem± break-±n, full break-±n
operat±on, or turns the break-±n opera-
t±on OFF when pushed ±n CW mode.
What is the break-in function?
The break-±n funct±on sw±tches transm±t and re-
ce±ve w±th CW key±ng. Full break-±n funct±on (QSK)
can mon±tor the rece±ve s±gnal dur±ng key±ng.
MF7 (MULTI-FUNCTION 7 SWITCH)
COMP SWITCH (COMP)
(p. 86)
Turns the speech compressor ON and
OFF ±n SSB mode.
Sw±tches the narrow, m±ddle or w±de
compress±on when pushed and held
for 1 sec.
What is the speech compressor?
The speech compressor compresses the trans-
m±tter aud±o ±nput to ±ncrease the average aud±o
output level, to ±ncrease talk power. Th±s funct±on ±s
effect±ve for long-d±stance commun±cat±on or when
propagat±on cond±t±ons are poor.
1
4
SWITCH (
1
4
)
(p. 30)
Turns the
1
4
speed tun±ng funct±on
ON and OFF ±n SSB data, CW, RTTY
and PSK modes.
1
4
funct±on sets d±al rotat±on to
1
4
of
normal speed for fine tun±ng.
TONE SWITCH (TONE)
(pgs. 62, 63)
Sw±tches between the tone encoder,
tone squelch funct±on and no-tone op-
erat±on when pushed ±n FM mode.
Enters the tone set mode when
pushed and held for 1 sec. ±n FM
mode.
4
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PANEL DESCRIPTION
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