Icom IC-7410 Instruction Manual - Page 63

AGC function

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5 FUNCTIONS FOR RECEIVE ■ 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 S elect either the SSB, CW, RTTY or AM mode. (p. 31) w P ush [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 S elect either the SSB, CW, RTTY or AM mode. (p. 31) w P ush [MENU] to display the "M1" screen (Menu 1), then hold down [AGC](F-1) for 1 second to display the "AGC" screen. e P ush 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 R otate [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 O­ FF. • 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 S elect another mode (except for FM), then repeat steps e and r, if desired. y P ush [MENU] to save, and exit the "AGC" screen. • Selectable AGC time constant (unit: seconds) Mode Default 0.3 (FAST) SSB 2.0 (MID) 6.0 (SLOW) 0.1 (FAST) CW/RTTY 0.5 (MID) 1.2 (SLOW) 3.0 (FAST) AM 5.0 (MID) 7.0 (SLOW) FM 0.1 (FAST) Selectable AGC time constant OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 Fixed [AGC] [MENU] Mode keys M1 AGC TBW SCP Hold down AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB Appears under the selected AGC speed's time constant display. Selected mode • When AGC fast is selected AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB • When AGC slow is selected AGC FAST 0.3s MID 2.0s SLOW 6.0s SSB 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 signal 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 rotate [DIAL] to set the time constant to OFF. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 56

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56
5
FUNCTIONS FOR RECEIVE
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■
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
(unit: seconds)
Mode
Default
Selectable AGC time constant
SSB
0.3 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
1.6
, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0
2.0 (MID)
6.0 (SLOW)
CW/RTTY
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
1.6
, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0
0.5 (MID)
1.2 (SLOW)
AM
3.0 (FAST)
OFF, 0.3, 0.5, 0.8, 1.2, 1.6
, 2.0,
2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0
5.0 (MID)
7.0 (SLOW)
FM
0.1 (FAST)
Fixed
• When AGC fast is selected
0.3s
2.0s
6.0s
FAST
MID
SLOW
SSB
AGC
• When AGC slow is selected
0.3s
2.0s
6.0s
FAST
MID
SLOW
SSB
AGC
[AGC]
[MENU]
Mode keys
Appears under the selected AGC
speed’s time constant display.
Selected mode
AGC
TBW
SCP
M1
0.3s
2.0s
6.0s
FAST
MID
SLOW
SSB
AGC
Hold down
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.