Beyerdynamic UHF Wireless System Opus 900 - Manual (Page 75)

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4. General Instructions for all Transmitters
4.1 Battery Change
• Switch the transmitter off before changing the battery.
• If you do not use the transmitter for several weeks or months, please remove the battery as it can
leak after some time and damage parts of the transmitter. Even “leak proof” may leak after some
time. Damage caused by leaking batteries is not covered under warranty.
• Clean the battery contacts from time to time by using a soft cloth moistened with spirits or alcohol.
• Please do not throw used battery packs away with your household rubbish, but take them to your
local collection points.
• When using rechargeable batteries use beyerdynamic chargers.
4.2 Before the Soundcheck
1. Check the transmitter battery and replace or recharge it if necessary. Use fresh alkaline batteries
only.
2. When the transmitter is switched off and immediately switched on again, it is possible that the
transmitter remains switched off. The cause is the function that allows to switch the transmitter
on / off silently. Should this problem occur during operation, the battery might have contact
problems. After switching off the transmitter you should wait at least 1 second, until you switch
the transmitter on again.
3. Check the performance area for dropouts. If you find any dropouts, try to eliminate them by
repositioning the antennae or the receiver.
4. The receiving antennas should be placed so that the distance between receiving antennae and
transmitter is at least 3 m. If necessary, use remote antennae (AT 70 A/B).
4.3 Positioning of Transmitters if Interference occurs
Put all transmitters in their position and switch them on. Switch each transmitter off one at a time
and check the receiver for interference in the corresponding channel.
The interference is possibly eliminated by changing the squelch (refer also to chapter
1.4.5 “Squelch”.
When using multi-channel-systems, please contact beyerdynamic. Interferences can also be caused by
DVB-T television transmitters in the neighbourhood.
4.4 What to Do to avoid Feedback
Feedback is caused by your microphone getting too close to a loudspeaker.
We recommend:
• Move away from the loudspeaker.
• Turn the microphone away from the loudspeaker.