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Please note: Squelch and ASC settings may require re-adjusting in low sensitivity
position.
Adjusting SQUELCH (muting) and ASC
Particularly in FM, noise can be a nuisance on a free channel. To suppress as much
noise as possible, Your radio is equipped not only with an ordinary muting control
(SQUELCH) like all CB radios have, but has also a preinstalled ASC circuit
(patented by GPE). Both circuits can be preset and adjusted independent of each
other. Please be careful with the squelch circuit: it may suppress noise, but if turned
too tigh, it can also suppress weaker signals.
There is a double potentiometer for both SQUELCH and ASC setting. The inner ring
is for SQUELCH, the outer ring is for ASC.
This is how to adjust the signal strength required to switch on the loudspeaker, using
the (inner) SQUELCH control knob:
The further the control knob is turned to the right, the stronger a signal has to be in
order to be audible through the loudspeaker.
In order to adjust the set to be the most sensitive to incoming signals, switch to a
free channel:
• Use the rotary switch or the microphone buttons to find a free channel,
where no signal is displayed.
• Then turn the SQUELCH control carefully to the right until the noise just
about disappears.
Now the loudspeaker stays off when on a free channel but it switches back on when
receiving even very faint signals.
The muting adjustment is particularly important during channel
scanning. In this mode the point to which the set is adjusted
decides whether scanning is stopped at the signal or not.
Therefore you should test the various muting settings for various
signal strengths and get to know this function.
ASC Noise and Interference Reduction
While the Squelch opens and closes statically at a certain preadjusted value of the
incoming signal, not taking into account interference signals, the ASC circuit works
very smooth and dynamically. If interference signals suddenly appear, ASC
automatically varies the threshold point to a safer adjustment and returns to the old
adjustment when interferences are disappearing again.
An example:
You have adjusted the SQUELCH carefully to the most sensitive point while the
engine of Your car was still off. Now You start the engine and switch on the
windshield wiper The squelch circuit will immediately regard the interference of the