ICOM IC-7000 说明手册
D
Setting the AGC time constant
74
5
FUNCTIONS FOR RECEIVE
5
■
AGC function
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.
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/WFM mode.
stant; fast, mid, slow) for non-FM/WFM mode.
The FM/WFM modes AGC time constant is fixed as
‘FAST’ (0.1 sec.) and AGC time constant cannot be
selected.
‘FAST’ (0.1 sec.) and AGC time constant cannot be
selected.
q Select non-FM/WFM mode with
[MODE]
.
w Select M
M--3
3.
e Push
[F-3
A
AG
GC
C
]
several times to select AGC fast,
AGC medium (MID) AGC slow or AGC OFF.
• “
,” “
,” “
” or “
” appears when
AGC fast, AGC medium (MID), AGC slow or AGC OFF
is selected, respectively.
is selected, respectively.
“
” (OFF)
appears when AGC time constant
OFF is set for one of FAST, MID, SLOW setting in
AGC set mode.
AGC set mode.
[MENU/GRP]
[F-3]
• Push and hold
[MENU/GRP]
for 1 sec. once or twice
to select the menu group M
M.
• Push
[MENU/GRP]
momentarily one or more times to
select the menu M
M--3
3.
D
AGC time constant selection
q Select the desired mode other than FM/WFM
modes.
w Select M
M--3
3.
e Push and hold
[F-3
A
AG
GC
C
]
for 1 sec. to enter the
AGC set mode.
r Push one of
[F-2
F
FA
AS
ST
T
]
,
[F-3
M
MI
ID
D
]
,
[F-4
S
SL
LO
OW
W
]
to select the desired AGC time constant.
t Rotate
[DIAL]
to set the desired time constant.
• AGC time constants can be selected between 0.1 to
8.0 sec. (depends on mode) or turned OFF.
• Push and hold
[F-2
F
FA
AS
ST
T
]
,
[F-3
M
MI
ID
D
]
or
[F-4
S
SL
LO
OW
W
]
for 1 sec. to select a default value each for fast, mid.
and slow, respectively.
and slow, respectively.
y Select another mode other than FM/WFM. Repeat
steps r and t, if desired.
• See table to the right for available time constants.
u Push
[
Z
Z
(
MENU
/
GRP
)]
to exit the AGC set mode.
• Selectable AGC time constant
(unit: sec.)
[MENU/GRP]
[DIAL]
[F-3] [F-4]
[F-2]
• Push and hold
[MENU/GRP]
for 1 sec. once or twice
to select the menu group M
M.
• Push
[MENU/GRP]
momentarily one or more times to
select the menu M
M--3
3.
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
0.5 (MID)
1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2,
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/WFM 0.1 (FAST)
Fixed