Lectrosonics UCR511 - Manual (Page 14)

UCR511
ANTENNA USE AND PLACEMENT
The receiver is supplied with two straight BNC antennas.
In some circumstances remote antennas such as the
SNA600 or ALP700 may be useful for improving recep­
tion. Position remote antennas at least three or four feet
apart and so that they are also not within three or four
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 antennas can also be configured with one
whip mounted directly onto the panel of the receiver, and
the other one mounted remotely.
Note
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 or 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
“dropout.” A dropout 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. A UHF dropout normally
sounds like a very brief “hiss” or a “swishing” sound.
Moving the transmitter (or the receiver’s antennas) even
a few inches will change the sound of the dropout, or
eliminate it. A dropout 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 receiver offers a sophisticated diversity design which
overcomes dropout problems in almost any situation. In
the event, however, that you do encounter a dropout
problem, first try moving the receiver’s antennas at least
three or four feet from their original location. This may
alleviate the dropout problem at that location. If dropouts
are still a problem, try moving the unit to an entirely
different location in the room or moving the receiver if
antennas are attached, or the receiver’s antennas in
closer to the transmitter location.
Lectrosonics transmitters radiate power very efficiently,
and the receivers are very sensitive. This reduces
dropouts to an insignificant level. If, however, you do
encounter dropouts frequently, call the factory or consult
your dealer. There is probably a simple solution.
REFLECTIVE SURFACE
DIRECT SIGNAL
INDIRECT SIGNAL
DIRECT SIGNAL
INDIRECT SIGNAL
TRANSMITTER
RECEIVER
PHASE
CANCELLATION
MULTI-PATH DROPOUT
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