Squelch And ReceVe (Rf) SensTVTy - Icom IC-7600 Instruction Manual

3
BASIC OPERATION
■ Squelch and receive (RF) sensitivity
Adjusts the RF gan and squelch threshold level.
The squelch removes nose output from the speaker
(closed poston) when no sgnal s receved.
• The squelch s partcularly effectve for AM and FM. It s
also avalable for other modes.
• 12 to 1 o'clock poston s recommended for any settng of
the [RF/SQL] control.
• The control can be set as 'Auto' (RF gan control n SSB,
CW, RTTY and PSK; squelch control n AM and FM)
or squelch control (RF gan s fxed at maxmum) n the
Others set mode, as follows. (p. 128)
SET MODE
Can be used n all modes.
Functons as nose squelch or S-meter
RF+SQL
squelch n
(default)
squelch only n other modes.
Operates as a squelch control.
SQL
• RF gan s fixed at maxmum senstvty.
Operates as an RF gan control n
SSB, CW, RTTY and PSK modes.
• Squelch s fixed open.
AUTO
Operates as a squelch control n the
AM and FM modes.
• RF gan s fixed at maxmum senstvty.
❍ Adjusting RF gain (Receve senstvty)
Normally, [RF/SQL] s set to the 11 o'clock poston.
Rotate [RF/SQL] to the 11 o'clock poston for max-
mum senstvty.
• Rotatng counterclockwse from the maxmum poston
reduces senstvty.
• The S-meter ndcates receve senstvty.
❍ Adjusting squelch (Removng non-sgnal nose)
Rotate [RF/SQL] clockwse when recevng no sgnal,
untl the nose just dsappears.
• [RX] ndcator lght goes out.
• Rotatng [RF/SQL] past the threshold pont nvokes the S-
meter squelch— ths allows you to set a mnmum sgnal
level needed to open the squelch.
33
OPERATION
FM modes; S-meter
the
the
[RF/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 s fxed open; SSB, CW, RTTY, PSK only)
Adjustable
range
Minimum RF gain
• When functioning as squelch control
(RF gan s fxed at maxmum.)
Noise squelch (FM mode)
Noise squelch
threshold
(FM mode)
Squelch is
open.
Shallow
Whle rotatng the RF gan control, nose may be
heard. Ths comes from the DSP unt and does not
ndcate an equpment malfuncton.
Recommended level
Maximum
RF gain
S-meter
squelch
Maximum
RF gain
S-meter squelch
threshold
S-meter
squelch
Deep