Squelch And Receive (Rf) Sensitivity - Icom IC-7000 Instruction Manual

3
BASIC OPERATION

■ Squelch and receive (RF) sensitivity

[RF/SQL] adjusts the RF gain and squelch threshold
level. The squelch removes noise output from the
speaker (closed position) when no signal is received.
• The squelch is particularly effective for FM. It is also
available for other modes.
• The 12 to 1 o'clock position is recommended for any
setting of the [RF/SQL] control.
• The control can be set as 'Auto' (RF gain control in SSB,
CW and RTTY; squelch control in AM, FM and WFM (RF
gain is fixed at maximum) in the miscellaneous (others)
Set mode as follows (p. 129).
SETTING
Can be used in all modes.
F u n c t i o n s a s n o i s e s q u e l c h o r
RF+SQL
S - m e t e r s q u e l c h i n F M m o d e ;
S-meter squelch only in other modes.
Operates as a squelch control.
SQL
• RF gain is fixed at maximum sensitivity.
Operates as an RF gain control in
SSB, CW and RTTY modes.
AUTO
• Squelch is fixed open.
(default) Operates as a squelch control in AM,
FM and WFM modes.
• RF gain is fixed at maximum sensitivity.
Adjusting RF gain
Normally, [RF/SQL] is set to the 11 o'clock position.
Rotate [RF/SQL] to the 11 o'clock position for
maximum sensitivity.
• Rotating counterclockwise from the maximum position
reduces sensitivity.
• The S-meter indicates receive sensitivity.
Adjusting squelch
Rotate [RF/SQL] clockwise when receiving no
signal, until the noise just disappears.
• [RX] indicator light goes out.
• Rotating [RF/SQL] past the threshold point invokes the
S-meter squelch—this allows you to set a minimum
signal level needed to open the squelch.
35
OPERATION
( Receive sensitivity)
( Removing non-signal noise)
[RF/SQL]
• When functioning as RF gain/squelch control
Noise squelch (FM mode)
Squelch is
open.
RF gain
adjustable
range
• When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
Adjustable
range
Minimum RF gain
• When functioning as squelch control
fixed at maximum)
Noise squelch (FM mode)
Noise squelch
threshold
(FM mode)
Squelch is
open.
Lowest threshold
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does
not indicate an equipment malfunction.
Recommended level
Maximum
RF gain
S-meter shows
squelch level
Maximum RF gain
(RF gain is
S-meter squelch
threshold
S-meter
squelch
Highest threshold