3
BASIC OPERATION
3-19
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 also
works in other modes.
• The 12 to 1 o’clock position is recommended for the most
effective use of the [RF/SQL]
(
L
) control.
• The [RF/SQL]
(
L
) control operates as only an RF gain
control (Squelch is fixed open), or a squelch control (RF
gain is fixed at maximum sensitivity) depending on the “RF/
SQL Control” option in
the “Function” Set mode. (p. 6-5)
SET
> Function >
RF/SQL Control
SET MODE
SETTING
OPERATING
MODE
[RF/SQL]
OPERATION
AUTO
A M / F M / W F M /
DV
Operates as only a squelch
control.
• RF gain is fixed at maxi
-
mum sensitivity.
SSB/CW/RTTY
Operates as only an RF
gain control.
• Squelch is fixed open.
SQL
ALL
Operates as only a squelch
control.
• RF gain is fixed at maxi
-
mum sensitivity.
RF+SQL
(default)
FM/DV
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.
❍
Adjusting RF gain
(Receive sensitivity)
Normally, [RF/SQL]
(
L
) is set to the 12 o’clock posi-
tion.
Rotate [RF/SQL]
(
L
) to the 11 o’clock position for
maximum sensitivity.
• Rotating counterclockwise from the maximum position re
-
duces sensitivity.
• The S-meter indicates receive sensitivity.
While rotating the RF gain control, a faint 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]
(
L
) clockwise when no signal is re-
ceived, until the noise just disappears.
• The TX/RX LED light goes out.
• Rotating [RF/SQL]
(
L
)
past the threshold point activates
the S-meter squelch— this allows you to set a minimum sig-
nal level needed to open the squelch.
[RF/SQL]
• When used as an RF gain/squelch control
• When used as an RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
• When used as a squelch control
(RF gain is fixed at maximum.)
Maximum
RF gain
S-meter
squelch
Noise squelch (FM/DV modes)
Squelch is
open.
RF gain
adjustable
range
Recommended level
Minimum RF gain
Adjustable
range
Maximum
RF gain
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM/DV modes)
Shallow
Deep
Noise squelch (FM/DV modes)
The
L
,
R
,
C
or
D
in the instructions indicate the
part of the controller.
L
: Left side,
R
: Right side,
C
: Center bottom
D
: Display (Touch screen)
