Agc Function; D Agc Speed Selection; D Setting The Agc Time Constant - Icom IC-i7410 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 three pre-set AGC time constants; fast, mid, and
slow for SSB, CW, RTTY and AM modes.
In the FM mode, the AGC time constant is fixed to
"FAST" (0.1 second).

D AGC speed selection

q Select either the SSB, CW, RTTY or AM mode.
(p. 31)
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. 31)
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 [DIAL] to set the desired time constant.
• 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.
t Select another mode (except for FM), then repeat
steps e and r, if desired.
y Push [MENU] to save, and exit the "AGC" screen.
• Selectable AGC time constant
Mode Default Selectable AGC time constant
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 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 [DIAL] to set the time constant to OFF.
FUNCTIONS FOR RECEIVE
[AGC]
[MENU] Mode keys
M1
A G C
Hold down
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
T B W 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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