21
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.
DSP