Icom IC-756 Instruction Manual page 5

i RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
- The squelch is particularly effective for FM. It is also
available for other modes.
- The control can be set as the RF gain control only
(squelch is fixed open) or squelch control (RF gain is
fixed at maximum) in set mode as follows. (p. 56)
- 11 to 12 o'clock position is recommended for any set-
ting of the [RF/SQL] control.
• When setting as RF gain/squelch control
Noise squelch (FM mode)
Recommended level
Squelch is
open.
RF gain
adjustable
range
• When setting as RF gain control
(Squelch is fixed open.)
Adjustable
range
Minimum RF gain
• When setting as squelch control
(RF gain is fixed at maximum.)
Noise squelch (FM mode)
Noise squelch
threshold (FM mode)
Squelch is
open.
Shallow
o RF POWER CONTROL [RF POWER]
Continuously varies the RF output power from min-
imum (2 W*) to maximum (100 W*).
* AM mode: 1 W to 40 W
Decreases
RF POWER
Maximum
RF gain
S-meter
squelch
Maximum
RF gain
S-meter squelch
threshold
S-meter
squelch
Deep
Increases
!0 BALANCE CONTROL [BAL] (inner control; p. 30)
Adjusts the audio output balance between main and
sub readout frequencies while in dualwatch.
BAL
Increases main
readout gain
!1 COMPRESSION LEVEL CONTROL [COMP]
(p. 34)
Adjusts the speech compression level in SSB.
Compression
level decreases
COMP
!2 NOISE REDUCTION LEVEL CONTROL [NR]
(outer control; p. 26)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
BAL
Decreases
OFF
!3 NOISE REDUCTION SWITCH [NR] (p. 26)
Toggles the noise reduction ON and OFF. Functions
in SSB, CW and RTTY modes.
NR
Noise reduction OFF
!4 NOISE BLANKER SWITCH [NB] (p. 26)
Toggles the noise blanker ON and OFF. The noise
blanker reduces pulse-type noise such as that gen-
erated by automobile ignition systems. This function
cannot be used for FM, or non-pulse-type noise.
NB
Noise blanker OFF
!5 S/RF METER (p. 34)
Shows the signal strength while receiving. Shows
the relative output power, SWR or ALC levels while
transmitting.
!6 MONITOR SWITCH [MONITOR] (p. 33)
Monitors your transmitted IF signal.
- The CW sidetone functions when [MONITOR] is OFF in
CW mode.
!7 ANTENNA TUNER SWITCH [TUNER] (p. 39)
• Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
• Starts to tune the antenna manually when pushed
for 2 sec.
- When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
PANEL DESCRIPTION
NR
Increases sub
readout gain
Compression
level increases
NR
Increases
NR
Noise reduction ON
NB
Noise blanker ON
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