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18
4
USING DIFFERENT OPERATING MODES
4-1 Operating SSB
Å
RECEIVING
➀
Push a band key to select the desired band.
➁
Push [SSB] to select LSB or USB.
• Below 10 MHz LSB is automatically selected; above 10
MHz USB is automatically selected.
➂
Rotate [AF] to set audio to a comfortable listening
level.
➃
Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
[BAND]
[DIAL]
[SSB]
[AF]
✔
Convenient functions for receive
q
Preamp and attenuator (p. 38)
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.
w
Noise blanker (p. 39)
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.
e
Noise reduction (p. 40)
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.
r
Auto notch filter (p. 40)
The auto notch function automatically attenuates more
than 3 beat tones, tuning signals, etc., even if they are
moving.
t
Twin PBT (passband tuning) (p. 41)
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.
y
AGC (auto gain control) (p. 39)
The AGC controls receiver gain to produce a constant
audio output level even when the received signal
strength is varied by fading, etc.
DSP
DSP
Summary of Contents for IC-746
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