Icom IC-756PRO 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.
• 12 to 1 o'clock position is recommended for any setting
of the [RF/SQL] control.
• The control can be set as 'Auto' (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM) or
squelch control (RF gain is fixed at maximum) in set
mode as follows. (p. 68)
SET MODE SETTING
MODE
AUTO
SSB, CW
RF GAIN
RTTY
AM, FM SQL
• When setting as RF gain/squelch control
Noise squelch (FM mode)
Squelch is
open.
RF gain
adjustable
range
• When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
Adjustable
range
Minimum RF gain
• When functioning as squelch control
(RF gain is fixed at maximum.)
Noise squelch (FM mode)
Noise squelch
threshold
(FM mode)
Squelch is
open.
Shallow
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
SQL RF GAIN + SQL
SQL RF GAIN + SQL
SQL RF GAIN + SQL
Recommended level
Maximum
RF gain
S-meter
squelch
Maximum
RF gain
S-meter squelch
threshold
S-meter
squelch
Deep
o RF POWER CONTROL [RF POWER]
Continuously varies the RF output power from min-
imum (5 W*) to maximum (100 W*).
* AM mode: 5 W to 40 W
Decreases
RF POWER
!0 BALANCE CONTROL [BAL] (inner control; p. 31)
Adjusts the audio output balance between main and
sub readout frequencies while in dualwatch.
BAL
Increases main
readout gain
!1 NOISE REDUCTION LEVEL CONTROL [NR]
(outer control; p. 27)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
BAL
Decreases
OFF
!2 NOISE REDUCTION SWITCH [NR] (p. 27)
Toggles the noise reduction ON and OFF.
NR
Noise reduction OFF
!3 NOISE BLANKER SWITCH [NB] (p. 27)
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
!4 S/RF METER (p. 36)
Shows the signal strength while receiving. Shows
the relative output power, SWR, ALC or compres-
sion levels while transmitting.
!5 MONITOR SWITCH [MONITOR] (p. 35)
Monitors your transmitted IF signal.
• The CW sidetone functions when [MONITOR] is OFF in
CW mode.
!6 ANTENNA TUNER SWITCH [TUNER] (p. 48)
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.
2
PANEL DESCRIPTION
Increases
NR
Increases sub
readout gain
NR
Increases
NR
Noise reduction ON
NB
Noise blanker ON
3