Agc Function; D Agc Speed Selection; D Setting The Agc Time Constant - Icom i9100 Instruction Manual

■ AGC function

The AGC (Auto Gain Control) controls receiver gain to
produce a constant audio output level, even when the
received signal strength varies greatly.
The transceiver has 3 pre-set AGC time constants: fast,
mid and slow for SSB, CW, RTTY and AM modes.
In the FM and DV modes, the AGC time constant is
fixed as "FAST" (0.1 second).

D AGC speed selection

q Select either the SSB, CW, RTTY or AM mode.
(p. 43)
w Push [MENU] to display the "M1" screen (Menu 1),
then push [AGC](F-1) one or more times to select
AGC fast ( ), AGC mid ( ) or AGC slow ( ).
"AGC OFF" appears when the selected AGC
speed's time constant is set to OFF.

D Setting the AGC time constant

q Select either the SSB, CW, RTTY or AM mode.
(p. 43)
w Push [MENU] to display the "M1" screen (Menu 1),
then hold down [AGC](F-1) for 1 second to display
the "AGC" screen.
e Push either [FAST](F-2), [MID](F-3) or [SLOW](F-4)
to select the desired AGC speed to be set.
• An underline appears below the time constant display.
r Rotate [MAIN DIAL] to set the desired time con-
stant.
• AGC time constant can be set to between 0.1 to 8.0
seconds (depending on the mode) or turned OFF.
• Hold down [FAST](F-2), [MID](F-3) or [SLOW](F-4) for
1 second to reset to the default setting for the selected
time constant, if desired.
t Select another mode (except for FM and DV), then
repeat steps e and r, if desired.
y Push [MENU] to save, and exit the "AGC" screen.
• Selectable AGC time constant
Default Selectable AGC time constant
Mode
0.3 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
SSB 2.0 (MID)
1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0
6.0 (SLOW)
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
CW/RTTY
0.5 (MID)
1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
3.0 (FAST)
OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
AM 5.0 (MID)
2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0
7.0 (SLOW)
FM/DV 0.1 (FAST) Fixed
(unit: seconds)
For your information
When you are receiving a weak signal, and a strong
signal is momentarily received, the AGC function
quickly reduces the receiver gain. When that sig-
nal disappears, the transceiver may not receive
the weak signal because of the AGC action. In that
case, hold down [AGC](F-1) for 1 second, and ro-
tate [MAIN DIAL] to set the time constant to OFF.
FUNCTIONS FOR RECEIVE
[MENU] [AGC]
M1
A G C D U P C O M P T B W
Hold down
• When AGC medium is selected
F A S T M I D
AGC
0 . 3 s 2 . 0 s
Appears under the selected AGC
speed's time constant display.
• When AGC fast is selected
F A S T M I D
AGC
0 . 3 s 2 . 0 s
• When AGC slow is selected
F A S T M I D
AGC
0 . 3 s 2 . 0 s
5
S C P
S L O W S S B
6 . 0 s
Selected mode
S L O W S S B
6 . 0 s
S L O W S S B
6 . 0 s
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