Agc Function - Icom IC-756PROII Instruction Manual

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.
The transceiver has 3 AGC characteristics (time con-
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
selected.
• AGC time constant selection
q Select non-FM mode.
w Push [AGC] several times to select AGC fast, AGC
medium (MID) or AGC slow.
AGC
MID
AGC
SLOW
AGC
FAST
• Selectable AGC time constant
Mode Default
0.3 (FAST)
SSB 2.0 (MID)
6.0 (SLOW)
0.1 (FAST)
CW 0.5 (MID)
1.2 (SLOW)
0.1 (FAST)
RTTY 0.5 (MID)
1.2 (SLOW)
3.0 (FAST)
AM 5.0 (MID)
7.0 (SLOW)
FM 0.1 (FAST)
30
Medium AGC time constant
Slow AGC time constant
Fast AGC time constant
(unit: sec.)
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, 0.1, 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
• Setting the AGC time constant
q Select the desired mode except FM mode.
w Push [AGC] for 1 sec. to enter AGC set mode.
ANT ANT
2.4k 2.4k 0
BW BW SFT SFT
1
VFO VFO
TX T X U S B U S B
qr.qot.pp
METER METER
Po Po
1 14.100.00 14.100.00
P.AMP P.AMP
1 VFO VFO USB USB
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ATT ATT
OFF OFF
1 14.100.00 14.100.00
AGC AGC
MID MID
SSB SSB
VOX VOX
FAST FAST 0.3 0.3 0.1 0.1
OFF OFF
MID MID 2.0 2.0 0.5 0.5
COMP COMP SLOW SLOW 6.0 6.0 1.2 1.2
OFF OFF
WIDE WIDE
DEF DEF
e Push [AGC] several times to select FAST time
constant.
r Rotate the tuning dial to set the desired time con-
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.'
• 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.'
• 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 i if desired.
!0 Push [EXIT/SET] to exit the AGC set mode screen.
qw:pp
FIL2 FIL2
USB USB
FIL2 FIL2
USB USB
AGC AGC
CW CW RTTY RTTY AM AM FM FM
0.1 0.1 3.0 3.0 0.1 0.1
5.0 5.0
0.5 0.5 --- ---
1.2 1.2 7.0 7.0 --- ---
(sec) (sec)