Rf Gain And Squelch; Meter Function - Icom IC-7200 Instruction Manual

■ RF gain and Squelch

The [RF/SQL] control adjusts the RF gain and
squelch threshold level. The squelch stops noise out-
put from the speaker (closed position) when no sig-
nal is received.
• The 12 o'clock position is recommended for any setting
of the [RF/SQL] control.
• The [RF/SQL] control can be set as the RF gain control
only (squelch is fixed open) or squelch control (RF gain is
fixed at maximum) in the set mode (p. 75). See the table
as below.
SET MODE SETTING
MODE
AUTO
SSB, CW
RF GAIN
RTTY
AM SQL
❍ Adjusting RF gain (Receive sensitivity)
Normally, the [RF/SQL] control is set to the 12 o'clock
position.
Rotate the [RF/SQL] control to the 11 o'clock posi-
tion for maximum sensitivity.
• Rotate the [RF/SQL] control clockwise to increase, coun-
terclockwise to decrease the receiver sensitivity.
• The S-meter indicates receive sensitivity.
❍ Adjusting squelch (Removing non-signal noise)
Rotate the [RF/SQL] control to the 1 o'clock posi-
tion to invoke the S-meter squelch— this allows you
to set the minimum signal level needed to open the
squelch.
• A segment appears in the S-meter to indicate the S-me-
ter squelch level.

■ Meter function

The transceiver has 3 transmit meter functions for
your convenience. Select the desired meter from RF
power (Po), ALC and SWR.
MODE
TUNER
SQL RF + SQL
SQL RF GAIN + SQL
SQL RF GAIN + SQL
ANF
NB NR
METER
V/M 1 A/B 2 3
SPLIT
1.8 = 3.5 7
4 5 6
MW M-CL AGC
10 14 18
7 8 9
COMP SCAN VOX
21 24 28
.
TS
0 F-INP ENT
RIT MNF
GENE 50
BAND
FILTER
P.AMP
ATT
M-CH/RIT
SPCH
SET
MODE
TUNER FILTER
[RF/SQL]
• When functioning as RF GAIN/SQL control
Squelch is open.
RF gain adjustable
range
• When functioning as RF GAIN control
Maximum RF gain
Adjustable range
Minimum RF gain
• When functioning as SQL control
Squelch is open.
Lowest Threshold
ANF
➥ Push and hold for 1 sec. to toggle between
METER
RF power (Po), SWR and ALC.
• The display indication changes as the following table.
DISPLAY
MEASUREMENT
INDICATION
Po Indicates the relative RF output power.
SWR Indicates the SWR on the transmission line.
Indicates the ALC level. When the meter
movement shows the input signal level
exceeds the allowable level, the ALC lim-
ALC
its the RF power. In such cases, reduce
the MIC gain setting (see p. 31) in the
quick set mode.
BASIC OPERATION
ANF
NB NR
METER
V/M 1 A/B 2 3
SPLIT
1.8 = 3.5 7
4 5 6
MW M-CL AGC
10 14 18
7 8 9
COMP SCAN VOX
21 24 28
.
TS
0
MNF F-INP ENT
RIT
GENE
50 BAND
P.AMP
ATT
M-CH/RIT
SPCH
SET
S-meter squelch
threshold
Maximum RF gain
S-meter squelch
S-meter squelch
threshold
S-meter squelch
Highest Threshold
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
30