ANTENNA USE AND PLACEMENT
There are two remote antenna assemblies included with this
receiver. Position the antennas at least three or four feet apart
and so that they are not within 3 or 4 feet of large metal surfaces.
If this is not possible, try to position the antennas so that they are
as far away from the metal surface as is practical. It is also good
to position the receiver so that there is a direct “line of sight”
between the transmitter and the receiver antenna. In situations
where the operating range is less than about 50 feet, the antenna
positioning is much less critical. The antennas can also be
configured with one whip mounted directly onto the rear panel
of the UDR200 receiver, and the other one mounted remotely.
A wireless transmitter sends a radio signal out in all directions.
This signal will often bounce off nearby walls, ceilings, etc. and
a strong reflection can arrive at the receiver antenna along with
the direct signal. If the direct and reflected signals are out of
phase with each other a cancellation may occur. The result
would be a “drop-out.” A drop-out sounds like either audible
noise (hiss), or in severe cases, may result in a complete loss of
the carrier and the sound when the transmitter is positioned in
certain locations in the room. A drop-out normally sounds like
“hiss” or a “swishing” sound. Moving the transmitter even a
few inches will change the sound of the hum or hiss, or elimi-
nate it. A drop-out situation may be either better or worse as the
crowd fills and/or leaves the room, or when the transmitter or
receiver is operated in a different location.
The UDR200 receiver offers a sophisticated diversity design
which overcomes drop-out problems in almost any imaginable
situation. In the event, however, that you do encounter a drop-
out problem, first try moving the antenna at least 3 or 4 feet from
where it was. This may alleviate the drop-out problem on that
antenna. If drop-outs are still a problem, try moving the antenna
to an entirely different location in the room or moving the
antennas in closer to the transmitter location. By observing the
OPTI-BLEND LEDs on the front panel, you can determine
which antenna is suffering weak signals.
Lectrosonics transmitters radiate power very efficiently, and the
receivers are very sensitive. This reduces drop-outs to an insig-
nificant level. If, however, you do encounter drop-outs fre-
quently, call the factory or consult your dealer. There is probably
a simple solution.
DIRECT SIGNAL
INDIRECT SIGNAL
DIRECT SIGNAL
INDIRECT SIGNAL
MULTI-PATH DROPOUT
RANSMITTER
RECEIVER
PHASE
CANCELLATION
REFLECTIVE SURFACE
Figure 3 - Drop-outs
6
(18 pages)
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