Squelch And Receive (Rf) Sensitivity - Icom i9100 Instruction Manual

■ 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)
OPERATING
SET MODE
MODE
SETTING
FM/DV
RF+SQL
(default)
SSB/CW/RTTY/
AM
ALL
SQL
SSB/CW/RTTY
AUTO
AM/FM/DV
❍ 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 threshold point activates the
S-meter squelch— this allows you to set a minimum signal
level needed to open the squelch.
[RF/SQL]
OPERATION
Operates as an RF
gain control, and
a noise squelch or
Smeter squelch.
Operates as an RF
gain control, and an
Smeter squelch.
Operates as only a
squelch control.
• RF gain is fixed at
maximum sensitivity.
Operates as only an
RF gain control.
• Squelch is fixed open.
Operates as only a
squelch control.
• RF gain is fixed at
maximum sensitivity.
[RF/SQL](MAIN Band)
[RF/SQL](SUB Band)
• When functioning as an RF gain/squelch control
Noise squelch (FM/DV modes)
Squelch is
open.
RF gain
adjustable
range
• When functioning as an RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
Adjustable
range
Minimum RF gain
• When functioning as a squelch control
(RF gain is fixed at maximum.)
Noise squelch (FM/DV modes)
Noise squelch
threshold
(FM mode)
Squelch is
open.
Shallow
BASIC OPERATION
Recommended level
Maximum
RF gain
S-meter
squelch
Maximum
RF gain
S-meter squelch
threshold
S-meter
squelch
Deep
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