D Selecting The Preset Value; D Adjusting The Agc Time Constant; D Setting The Agc Time Constant Preset Value - Icom IC-7800 Instruction Manual

■ AGC function
[AGC] control for main [AGC] control for sub
[AGC VR] for main [AGC VR] for sub

D Selecting the preset value

D Adjusting the AGC time constant

D Setting the AGC time constant preset value

• Selectable AGC time constant
Mode Default Selectable AGC time constant
0.3 (FAST)
0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
SSB 2.0 (MID)
2.5, 3.0, 4.0, 5.0, 6.0
6.0 (SLOW)
0.1 (FAST)
0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
CW 0.5 (MID)
2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
0.1 (FAST)
RTTY 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
0.5 (MID)
PSK 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
3.0 (FAST)
0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0,
AM 5.0 (MID)
4.0, 5.0, 6.0, 7.0, 8.0
7.0 (SLOW)
FM 0.1 (FAST) Fixed
The AGC (auto gain control) controls receiver gain to
produce a constant audio output level even when the
received signal strength is varied by fading, etc.
The transceiver has 3 AGC characteristics (time con-
stant; fast, mid, slow) for non-FM mode.
The FM mode AGC time constant is fixed as 'FAST'
(0.1 sec.) and AGC time constant cannot be se-
lected.
[AGC]
q Select non-FM mode.
w Push [AGC] several times to select AGC fast, AGC
medium (MID) or AGC slow.
q Select non-FM mode.
w Push [AGC VR], then rotate [AGC] control to adjust
the AGC time constant.
• [AGC VR] indicator above the switch lights green.
q Select the desired mode except FM mode.
w Push [AGC] for 1 sec. to enter AGC set mode.
e Push [AGC] several times to select FAST time con-
stant.
r Rotate the main dial to set the desired time constant
for 'AGC FAST.'
• AGC time constant can be set between 0.1 to 8.0 sec.
(unit: sec.)
• Push [F-4•DEF] for 1 sec. to select a default value.
t Push [AGC] to select medium time constant.
y Rotate the main dial to set the desired time constant
for 'AGC MID.'
• AGC time constant can be set between 0.1 to 8.0 sec.
• Push [F-4•DEF] for 1 sec. to select a default value.
u Push [AGC] to select slow time constant.
i Rotate the main dial to set the desired time constant
for 'AGC SLOW.'
• AGC time constant can be set between 0.1 to 8.0 sec.
• Push [F-4•DEF] for 1 sec. to select a default value.
o Select another mode except FM. Repeat steps e to
i if desired.
!0 Push [EXIT/SET] to exit the AGC set mode screen.
5-11
FUNCTIONS FOR RECEIVE
(depends on mode) or turned OFF.
(depends on mode) or turned OFF.
(depends on mode) or turned OFF.
5