Agc Function; 1/4 Function; Nb Function - Icom IC-746 Instruction Manual

5-4 AGC function

1 ANT USB
1 3 5 7 9 20 40
S
Po
20 50 100%
ALC
SWR
1 1.5 2 3
OFF
P. AMP AGC
1
F S
F1 F2 F3
Toggles AGC ON/OFF AGC indicators

5-5 1/4 function

1 ANT
1 3 5 7 9 20 40 60
S
Po
20 50 100%
ALC
SWR
1 1.5 2 3
AMP AGC
P.
1
F
F1 F2 F3
1/4 function ON/OFF

5-6 NB function

[NB]
60
BLANK
VFOA
CH
F4 F5
CW
1
4
BLANK
VFOA
CH
F4 F5
1/4 function indicator
FUNCTIONS FOR RECEIVE
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.
While menu set 1 is displayed, push [F1](
or more times to select AGC fast or AGC slow.
• The corresponding indicator appears in the display.
• AGC slow cannot be selected in FM mode.
Push [F1]( ) for 2 sec. to turn the AGC function
OFF.
• AGC should normally be set to AGC fast for CW and
RTTY operation and to AGC slow for SSB and AM oper-
ation.
• Turn AGC OFF when receiving a very weak signal near a
strong signal.
NOTE: When the AGC function is turned OFF, the
S-meter does not function.
When the 1/4 function is ON, one complete rotation of
the tuning dial changes the frequency by 1.25 kHz
(normally one rotation changes the frequency by 5
kHz). This is convenient when critical setting is re-
quired and is only available in CW and RTTY modes.
Push [CW/RTTY] to select CW or RTTY mode.
While menu set 1 is selected, push [F3](
toggle the 1/4 function ON and OFF.
• When the function is ON, "1/4" appears in the function
display.
• This can be set independently for CW and RTTY modes.
• When the TS function is turned ON, the TS function has
priority.
The noise blanker reduces pulse-type noise such as
that generated by automobile ignition systems. This
function is not effective for AM and FM, or non pulse-
type noise.
Push [NB] to toggle the noise blanker function ON
and OFF.
• When the noise blanker function is turned ON in AM
mode and a strong signal is received, audio may distort.
In this case turn the function OFF.
5
) one
) to
39