Icom IC-9100 [53/212] Squelch and receive rf sensitivity

Icom IC-9100 [53/212] Squelch and receive rf sensitivity
Squelch and receive (RF) sensitivity
Adjusts the RF gain and squelch threshold level. The
squelch removes noise output to the speaker when no
signal is received (closed squelch).
•ThesquelchisparticularlyeffectiveforAMandFM,butcan
also be used in other modes.
•The12to1o’clockpositionisrecommendedforthe most
effective use of the [RF/SQL] control.
•[RF/SQL]canoperateasonlyanRF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.
SSB/CW/RTTY/
AM
Operates as an RF
gain control, and an
Smeter squelch.
SQL
ALL
Operates as only a
squelch control.
•RF gain is fixed at
maximum sensitivity.
AUTO
SSB/CW/RTTY
Operates as only an
RF gain control.
•Squelchisxedopen.
AM/FM/DV
Operates as only a
squelch control.
•RF gain is fixed at
maximum sensitivity.
Adjusting RF 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.
•Rotatingcounterclockwisefromthemaximumpositionre-
duces sensitivity.
•TheS-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.
Adjusting squelch (Removing non-signal noise)
Rotate [RF/SQL] clockwise when no signal is received,
until the noise just disappears.
•TheTX/RXindicatorlightgoesout.
•Rotating[RF/SQL]pastthethresholdpointactivatesthe
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)
When functioning as an RF gain/squelch control
Maximum
RF gain
S-meter
squelch
Noise squelch (FM/DV modes)
Squelch is
open.
RF gain
adjustable
range
Recommended level
When functioning as an RF gain control
(Squelchisxedopen;SSB,CW,RTTYonly)
Minimum RF gain
Adjustable
range
Maximum
RF gain
When 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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