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PROFESSIONAL AUDIO & SOUND
RACK MOUNTING
RDU216 are 1/2 19" casings and are specially designed (optional) 19" rack mount adapters
(PRK216) are available for your installation purposes. Installation instructions are as Fig. 10.
RF INTERFERENCE
RF Interference
If you encounter receiving interference (from other than an
operating TV station), often it can be overcome by adjusting the
r e c e i v e r ' s s q u e l c h
Please note that wireless frequencies are shared with other radio
services. According to FCC regulations, wireless microphone
operations are unprotected from interference from other licensed
operations in the band.
Receiver Squelch Control
The squelch control on the back panel of the receiver is preset at
the factory, but can be adjusted if you must use the system in a high
RF interference area. If there is audio output from the receiver
when your transmitter is OFF, adjust the squelch control so the
system will receive the signal from your transmitter but squelch or
eliminate the unwanted background RF noise. This adjustment can
cause a reduction in usable range of the wireless transmitter, so set
the control to the lowest position which reliably mutes the unwanted
RF signal.
RF Test Function
The most unique feature of this unit is the RF test manual scanner
feature. By pressing the RF test button, the user is free to scan
through all the channels to look for a clean channel before
operation. When the RF test button is pressed, a lighted RF
indicator means that the selected channel is occupied and
interference will occur when
Fig.10
c o n t r o l , a s d e s c r i b e d b e l o w .
used.
5
TIPS TO OBTAIN THE BEST RESULTS
FOR A WIRELESS MICROPHONE SYSTEM
If an external antenna is used a low loss 50-ohm RF shielded cable must be
used and the length of the cable should not exceed 3 meters.
The receiver antenna should be kept away from any metal surface.
If the volume control of the receiver is set too high, it may over-drive the input,
causing distortion. Conversely, if the receiver output is set too low, the overall
signal to noise ratio of the system may be reduced. Adjust the output level of
the receiver such that highest sound pressure level going into the microphone
causes no input overload in the mixer, and yet permits the mixer level controls
to operate in their normal range (not too high or too low). This provides the
optimum signal to noise for the entire system.
Before inserting the batteries, please make sure that they are inserted
according to the correct polarity.
Before system operation, please make sure that the corresponding receiver
MUST have the same channel number as the transmitter.
Before making any channel change, please switch off the power supply. The
synthesized program works in such a way that a change of channel will only
take place after a power off and on action. Otherwise, the previously selected
frequency will stay unchanged.
After making a channel change, please make sure that the corresponding
change is made on the matching receiver also. To be exact, changes MUST be
made at both the transmitter and receiver.
Use only brand new alkaline batteries. Do not use " general purpose "
batteries. When batteries are weak, replace the batteries altogether at the same
time. Do not mix and use new and old batteries together.
Position the receiver such that it has the least possible obstructions between it
and the transmitter. Line of sight is best!
The transmitter and the receiver should be as close as possible but not less
than 1 meter.
A receiver cannot receive signals from two or more transmitters simultaneously.
Turn the transmitter off when it is not in use. Remove the batteries if the
transmitter is not to be used for a period of time.
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