ICOM ic-756pro ユーザーズマニュアル
30
5
RECEIVE AND TRANSMIT
■
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 mode.
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.
lected.
• AGC time constant selection
q
Select non-FM mode.
w
Push [AGC] one or more times to select AGC fast,
AGC medium (MID) or AGC slow.
AGC medium (MID) or AGC slow.
• Selectable AGC time constant
(unit: sec.)
• Setting the AGC time constant
q
Select the desired mode except FM mode.
w
Push [AGC] for 2 sec. to enter AGC set mode.
e
Push [AGC] one or more times to select FAST time
constant.
constant.
r
Rotate the tuning dial to set the desired time con-
stant for ‘AGC FAST.’
stant for ‘AGC FAST.’
• AGC time constant can be set between 0.1 to 8.0 sec.
(depends on mode) or turned OFF.
• Push [(F-3)DEF] to select a default value.
t
Push [AGC] to select medium time constant.
y
Rotate the tuning dial to set the desired time con-
stant for ‘AGC MID.’
stant for ‘AGC MID.’
• AGC time constant can be set between 0.1 to 8.0 sec.
(depends on mode) or turned OFF.
• Push [(F-3)DEF] to select a default value.
u
Push [AGC] to select slow time constant.
i
Rotate the tuning dial to set the desired time con-
stant for ‘AGC SLOW.’
stant for ‘AGC SLOW.’
• AGC time constant can be set between 0.1 to 8.0 sec.
(depends on mode) or turned OFF.
• Push [(F-3)DEF] to select a default value.
o
Select another mode except FM. Repeat steps
e
to
o
if desired.
!0
Push [EXIT] to exit the AGC set mode screen.
ANT
ANT
1
METER
METER
Po
Po
P.AMP
P.AMP
1
ATT
ATT
OFF
OFF
OFF
VOX
VOX
OFF
OFF
OFF
COMP
COMP
OFF
OFF
WIDE
WIDE
DEF
DEF
SFT
SFT
0
FIL2
FIL2
U S B
U S B
qw:pp
AGC
AGC
MID
MID
MID
TX
TX
VFO
VFO
USB
USB
USB
USB
USB
USB
FIL2
FIL2
qr≥qot≥pp
qr≥wpt≥pp
14.100.00
14.100.00
14.100.00
14.100.00
1
1
VFO
VFO
BW
BW
2.4k
2.4k
AGC
AGC
(sec)
(sec)
FM
FM
AM
AM
0.1
0.1
3.0
3.0
5.0
5.0
7.0
7.0
1.2
1.2
0.5
0.5
0.1
0.1
0.1
0.1
0.3
0.3
2.0
2.0
6.0
6.0
0.5
0.5
1.2
1.2
---
---
---
---
SSB
SSB
FAST
FAST
SLOW
SLOW
MID
MID
CW
CW
RTTY
RTTY
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
1.2, 1.6, 2.0, 2.5, 3.0, 4.0,
5.0, 6.0
2.0 (MID)
6.0 (SLOW)
CW
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
1.2, 1.6, 2.0, 2.5, 3.0, 4.0,
5.0, 6.0
0.5 (MID)
1.2 (SLOW)
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
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
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
AGC
AGC
MID
MID
MID
AGC
AGC
SLOW
SLOW
AGC
AGC
FAST
FAST
Medium AGC time constant
Slow AGC time constant
Fast AGC time constant