DIRECT SIGNAL
RECEIVER
ANTENNA USE AND PLACEMENT
There are two 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 100 feet, the an-
tenna positioning is much less critical. The antennas can also
be configured with one whip mounted directly onto the rear
panel of the UCR300 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 UCR300 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 an-
tenna to an entirely different location in the room or moving the
antennas in closer to the transmitter location.
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 frequently,
call the factory or consult your dealer. There is probably a simple
solution.
REFLECTIVE SURFACE
DIRECT SIGNAL
INDIRECT SIGNAL
INDIRECT SIGNAL
TRANSMITTER
PHASE
CANCELLATION
MULTI-PATH DROPOUT
8
(14 pages)
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