Listen LT-800 User Manual page 37

LR-100 Setup and Programming
Squelch
6
The squelch adjustment is important to ensure the
receiver audio is muted when no signal is present. You
want to set the squelch adjustment for the highest
setting without squelching the incoming signal.
To set the squelch control:
a. Turn the transmitter OFF.
b. Listen to the receiver audio on the speaker or head-
phone. Turn the audio level down in the begin-
ning.
c. Adjust the squelch adjustment clockwise until the
squelch LED goes off (not illuminated). You will
hear radio noise now. This is the audio you want
to squelch (mute) when the transmitter is off.
d. Now adjust the squelch setting counter clockwise
until it squelches (mutes). This is the minimum
squelch setting.
e. Now turn the transmitter on. Adjust the squelch
setting counter clockwise until the unit
squelches. This is the maxium squelch
theshold. Please note that if you are close to
the transmitter, you may not be able to find the
maxium squelch threshold due to the high RF
signal of the transmitter.
f. Set the squelch adjustment between the
maximum and minimum squelch thresholds,
keeping the following in mind.
• Minimum squelch threshold. By adjusting
the unit near this threshold, you will
maximize the probability the unit will NOT
squelch when the transmitter is on.
However, you also run the risk having the
unit NOT squelched (and resulting radio
noise coming through the system) when
the transmitter is off. You may experience
unsquelching of the receiver by interfer-
ence as well.
Maximum squelch threshold. By
•
adjusting the unit near this threshold, you
will greatly increase the chance the unit
will squelch when the transmitter is off
AND you will minimize the probability that
the unit will be unsquelched by interfer-
ence. However, you are also increasing
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the chances that the signal coming from the
transmitter will be squelched. Thus, if the
RF signal from the transmitter dips just
slightly (someone walks in front of the
antenna), you will experience momentary
squelching of the audio.
CAUTION: Ensure proper setting of the squelch
adjustment to prevent user ear damage and
unwanted radio noise. Users will find
unsquelched receiver noise very objection-
able.
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