Lectrosonics UCR210d - Manual (Page 8)

ANTENNA USE AND PLACEMENT
The receiver is supplied with two straight BNC antenna. In some
circumstances remote anteannas such as the SNA600 or ALP700
may be useful for improving reception. Position remote 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 antenna positioning is much less critical. The anten­
nas can also be configured with one whip mounted directly onto the
panel of the UCR210D receiver, and the other one mounted re­
motely.
Be careful about the length of cabling from antenna to receiver.
Long cable runs can have serious signal loss. Lectrosonics has in-
line RF amplifiers suitable for compensating for long cable runs.
Contact your dealer of the factory for more information.
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 UHF drop-out normally sounds like a short “hiss” or a
“swishing” sound. Moving the transmitter even a few inches will
change the sound of the hum or hiss, or eliminate 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 UCR210D receiver offers a sophisticated diversity design
which overcomes drop-out problems in almost any situation. In the
event, however, that you do encounter a dropout 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.
Lectrosonics transmitters radiate power very efficiently, and the
receivers are very sensitive. This reduces drop-outs to an insignifi­
cant 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