Zeck d.a.i.sy DS 800 UHF Manuel D'utilisation page 33

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The sound is interrupted by short drop-outs.
Check the transmitter battery for proper contact. If necessary, re-tighten the
transmitter's battery terminals carefully to provide more pressure against the
battery contacts. If the battery is not the problem, the noise suppression adjust-
ment screw (10) might be set too high and should be re-adjusted counterclock-
wise. Additionally, check the receiver antennas for proper alignment in a right-
angled 'V' pattern.
The battery gets very warm.
The battery has been inserted with wrong polarity, resulting in a quick discharge.
Install new battery, observing proper polarity.
Turning off the transmitter creates a loud noise in the speakers.
The transmitter switch provides a means for saving battery capacity during
longer intermissions. A fully noiseless operation of the switch is not intended. It
is advisable to mute the receiver or the subsequent input before turning off the
transmitter.
The reception gets disturbed repeatedly.
Somebody is probably using another wireless system nearby which occupies the
same carrier frequency as your DS800UHF. In this case, use the channel selector
switches on both transmitter (8) and receiver (23) for switching your
DS800UHF to another carrier frequency.
The reception gets disturbed although there is no other wireless system
used nearby.
Digital audio devices, like keyboards or effect units, with poor internal shielding
are able to radiate disturbing r.f. frequencies that can have a negative effect on
the performance of nearby wireless systems. To find out which one of the digital
devices on stage is causing the trouble, unplug their mains cables one after the
other until the interference disappears. The interfering device should be re-located
at least 5 meters away from the receiver.
How can I find out if my transmission channel is not occupied by other
wireless radio services?
The most accurate method is using a r.f. scanner to analyze the local r.f. spectrum.
If one is not available, proceed as follows: turn on both receiver and transmitter
and watch the RF detector LED (11) on the receiver turning red. Now turn the
transmitter off. If the RF LED does not become dark or if the receiver is producing
loud noises, your selected channel is occupied by another local radio service.
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