ICOM IC-7000 说明手册
35
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.
speaker (closed position) when no signal is received.
• The squelch is particularly effective for FM. It is also avail-
able for other modes.
• The 12 to 1 o’clock position is recommended for any set-
ting 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).
gain is fixed at maximum) in the miscellaneous (others)
set mode as follows (p. 129).
Adjusting RF gain
(Receive sensitivity)
Normally,
[RF/SQL]
is set to the 11 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.
Adjusting squelch
(Removing non-signal noise)
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.
level needed to open the squelch.
• When functioning as RF gain/squelch control
• When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
• When functioning as squelch control
(RF gain is
fixed at maximum)
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
Squelch is
open.
open.
S-meter
squelch
squelch
S-meter squelch
threshold
threshold
Noise squelch
threshold
(FM mode)
threshold
(FM mode)
Lowest threshold
Highest threshold
Noise squelch (FM mode)
Minimum RF gain
Adjustable
range
range
Maximum RF gain
Recommended level
RF gain
adjustable
range
adjustable
range
Maximum
RF gain
RF gain
S-meter shows
squelch level
squelch level
Noise squelch (FM mode)
Squelch is
open.
open.
[RF/SQL]
SETTING
OPERATION
RF+SQL
Can be used in all modes.
(default)
Functions as noise squelch or S-meter
squelch in FM mode; S-meter squelch
only in other modes.
squelch in FM mode; S-meter squelch
only in other modes.
SQL
Operates as a squelch control.
• RF gain is fixed at maximum sensitivity.
Operates as an RF gain control in
SSB, CW and RTTY modes.
SSB, CW and RTTY modes.
AUTO
• Squelch is fixed open.
Operates as a squelch control in AM,
FM and WFM modes.
FM and WFM modes.
• RF gain is fixed at maximum sensitivity.