Icom IC-7800 Instruction Manual page 14

1
PANEL DESCRIPTION
■ Front panel (continued)
!9
@0
@1
@2
@3
@4
@5
@6
!9 AGC CONTROL [AGC] (for MAIN band; p. 5-12)
@0 AGC CONTROL [AGC] (for SUB band; p. 5-12)
Adjusts the continuously-variable AGC circuit time
constant.
• To use [AGC] control, push the appropriate band's
[AGC VR] ([AGC VR] indicator lights).
Fast
@1 AGC VOLUME SWITCH [AGC VR]
(for MAIN band; p. 5-12)
@2 AGC VOLUME SWITCH [AGC VR]
(for SUB band; p. 5-12)
➥ Push to toggle [AGC] control usage ON or OFF.
• Use [AGC] control to set the AGC time constant
when switched ON.
• The [AGC VR] indicator above this switch lights
green when the control is ON.
➥ Turns the AGC function OFF when held down for
1 second.
@3 AF CONTROL [AF] (inner control; for SUB band)
@4 AF CONTROL [AF] (inner control; for MAIN band)
Varies the audio output level of the speaker or
headphones.
Audio output
decreases
@7 @8 @9
Slow
Audio output
increases
#0
#2
@5 RF GAIN CONTROL [RF]
(outer control; for MAIN band; p. 3-9)
@6 RF GAIN CONTROL [RF]
(outer control; for SUB band; p. 3-9)
Adjusts the RF gain level.
While rotating the RF gain control, you may hear
noise. This comes from the DSP unit and does
not indicate a malfunction.
Sensitivity
decreases
@7 SQUELCH CONTROL [SQL]
(outer control; for MAIN band; p. 3-9)
@8 SQUELCH CONTROL [SQL]
(outer control; for SUB band; p. 3-9)
Adjusts the squelch threshold level. The squelch re-
moves noise output from the speaker (closed con-
dition) when no signal is received.
• The squelch is particularly effective for FM. It is also
available for other modes.
• 11 to 12 o'clock position is recommended for any set-
ting of the [SQL] control.
Shallow
1-4
#1
#3 #4
Sensitivity
increases
Noise squelch
Squelch
threshold
Deep
Squelch
is open.
Shallow
S-meter
squelch
Deep