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4
USING DIFFERENT OPERATING MODES
✔Convenient functions for receive
q Preamplifier 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 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.
t 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.
y 1/4 function (p. 39) Normally, one rotation of the tuning dial changes the
frequency by about 5 kHz (in 10 Hz tuning steps).
Using the 1/4 function sets the tuning dial so that one
rotation changes the frequency by about 1.25 kHz (in
10 Hz steps).This is convenient for critical tuning.
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