Icom IC-756PRO - [RF UNIT]

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.
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 se-
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.
•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.
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 o if desired.
!0 Push [EXIT] to exit the AGC set mode screen.
ANTANT
1
METERMETER
PoPo
P.AMPP.AMP
1
ATTATT
OFFOFF
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
DEFDEF
SFTSFT
0
FIL2FIL2
USBUSB
qw:pp
AGCAGC
MIDMID
TXTX
VFOVFO
USBUSB
USBUSB
USBUSB
FIL2FIL2
qr≥qot≥pp
qr≥wpt≥pp
14.100.0014.100.00
14.100.0014.100.00
1
1
VFOVFO
BWBW
2.4k2.4k
AGCAGC
(sec)(sec)
FMFM
AMAM
0.10.1
3.03.0
5.05.0
7.07.0
1.21.2
0.50.5
0.10.1
0.10.1
0.30.3
2.02.0
6.06.0
0.50.5
1.21.2
------
------
SSBSSB
FASTFAST
SLOWSLOW
MIDMID
CWCW RTTYRTTY
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
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)
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
AGCAGC
MIDMID
AGCAGC
SLOWSLOW
AGCAGC
FASTFAST
Medium AGC time constant
Slow AGC time constant
Fast AGC time constant