Using Different Operating Modes; Operating Ssb - Icom IC-746 Instruction Manual

4

USING DIFFERENT OPERATING MODES

4-1 Operating SSB

Å RECEIVING
[AF] [SSB]
q Preamp and attenuator (p. 38)
w Noise blanker (p. 39)
e Noise reduction (p. 40)
r Auto notch filter (p. 40)
t Twin PBT (passband tuning) (p. 41)
y AGC (auto gain control) (p. 39)
18
[BAND]
[DIAL]
Convenient functions for receive
DSP
DSP
Push a band key to select the desired band.
Push [SSB] to select LSB or USB.
• Below 10 MHz LSB is automatically selected; above 10
MHz USB is automatically selected.
Rotate [AF] to set audio to a comfortable listening
level.
Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
The preamp amplifies received signals in the front end
circuit to improve the S/N ration and sensitivity. The at-
tenuator prevents a desired signal from distorting
when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from a broadcasting station, are near you.
The noise blanker is used to reduce pulse-type noise
caused by vehicle ignition systems and key clicks from
strong CW signals on nearby frequencies.
The noise reduction function reduces noise compo-
nents and picks out desired signals which are buried
in noise. This function digitally transposes receive
audio components to produce desired AF frequency
characteristics at the IF stage.
The auto notch function automatically attenuates more
than 3 beat tones, tuning signals, etc., even if they are
moving.
The PBT function electronically narrows the receiver's
IF passband widths to reduce interference. Moving
both [TWIN PBT] controls to the same position shifts
the IF.
The AGC controls receiver gain to produce a constant
audio output level even when the received signal
strength is varied by fading, etc.