Icom IC-9100 - Adjusting RF Gain; Adjusting Squelch; Basic Transmit Operation; Squelch and Receive Sensitivity

N3QUELCHANDRECEIVE2&SENSITIVITY
Adjusts the RF gain and squelch threshold level. The
squelch removes noise output to the speaker when no
signal is received (closed squelch).
s4HESQUELCHISPARTICULARLYEFFECTIVEFOR!-AND&-BUTCAN
also be used in other modes.
s4HETOOCLOCKPOSITIONISRECOMMENDEDFORthe most
effective use of the [RF/SQL] control.
s;2&31,=CANOPERATEASONLYAN2&GAINCONTROLSquelch
is fixed open) or only a squelch control (RF gain is fixed at
maximum sensitivity) depending on the
“RF/SQL Control”
option in
the Set mode. (p. 162)
SET MODE
SETTING
OPERATING
MODE
[RF/SQL]
OPERATION
RF+SQL
(default)
FM/DV
Operates as an RF
gain control, and
a noise squelch or
Smeter squelch.
33"#72449
AM
Operates as an RF
gain control, and an
Smeter squelch.
SQL
ALL
Operates as only a
squelch control.
s2& GAIN IS FIXED AT
maximum sensitivity.
AUTO
33"#72449
Operates as only an
RF gain control.
s3QUELCHISlXEDOPEN
AM/FM/DV
Operates as only a
squelch control.
s2& GAIN IS FIXED AT
maximum sensitivity.
M!DJUSTING2&GAIN(Receive sensitivity)
Normally, [RF/SQL] is set to the 12 o’clock position.
Rotate [RF/SQL] to the 11 o’clock position for maxi-
mum sensitivity.
s2OTATINGCOUNTERCLOCKWISEFROMTHEMAXIMUMPOSITIONRE-
duces sensitivity.
s4HE3METERINDICATESRECEIVESENSITIVITY
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
M!DJUSTINGSQUELCH(Removing non-signal noise)
Rotate [RF/SQL] clockwise when no signal is received,
until the noise just disappears.
s4HE4828INDICATORLIGHTGOESOUT
s2OTATING;2&31,=PASTTHETHRESHOLDPOINTACTIVATESTHE
S-meter squelch— this allows you to set a minimum signal
level needed to open the squelch.
[RF/SQL](MAIN Band)
[RF/SQL](SUB Band)
s7HENFUNCTIONINGASAN2&GAINSQUELCHCONTROL
Maximum
RF gain
S-meter
squelch
Noise squelch (FM/DV modes)
Squelch is
open.
RF gain
adjustable
range
Recommended level
s7HENFUNCTIONINGASAN2&GAINCONTROL
3QUELCHISlXEDOPEN33"#72449ONLY
Minimum RF gain
Adjustable
range
Maximum
RF gain
s7HENFUNCTIONINGASASQUELCHCONTROL
(RF gain is fixed at maximum.)
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM mode)
Shallow Deep
Noise squelch (FM/DV modes)
44
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BASIC OPERATION
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