Icom IC-i7410 - Squelch and Receive (RF) Sensitivity

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BASIC OPERATION
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■ 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 position).
•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”
setting in the Set mode. (p. 86)
SET MODE
SETTING
OPERATING
MODE
[RF/SQL]
OPERATION
RF+SQL
(default)
FM
Operates as an RF
gain control, and a
noise squelch or S-
meter squelch.
SSB/CW/
RTTY/AM
Operates as an RF
gain control, and an S-
meter squelch.
SQL
ALL
Operates as only a
squelch control.
•RFgainisxedatmaxi-
mum sensitivity.
AUTO
SSB/CW/
RTTY
Operates as only an
RF gain control.
•Squelchisxedopen.
AM/FM
Operates as only a
squelch control.
•RFgainisxedatmaxi-
mum 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RXindicatorlightgoesout.
•Rotating[RF/SQL]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]
• When functioning as an RF gain/squelch control
Maximum
RF gain
S-meter
squelch
Noise squelch (FM mode)
Squelch is
open.
RF gain
adjustable
range
Recommended level
• 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 mode)
• When functioning as an RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
Minimum RF gain
Adjustable
range
Maximum
RF gain