Lectrosonics CR187 - Manual (Page 8)

CR187
Antenna Use and Placement
Connect the antenna to the front panel jack. Position the
antenna so that it is not touching any metallic surfaces.
It is also good to position the receiver so that there is a
direct “line of sight” between the transmitter and the re­
ceiver antenna. In situations where the operating range
is less than about 50 feet, the antenna positioning is
much less critical.
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 re­
ceiver 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. Moving the transmitter even a
few inches may eliminate it. A dropout situation may be
either better or worse as a crowd fills and/or leaves a
room, or when the transmitter or receiver is operated in
a different location.
Example mounting locations
for single or multiple receiver(s).
Dropouts can be avoided by careful placement of the
receiver. If you are mounting the receiver on a video
camera or camcorder, experiment with the location prior
to going into the field. By placing the antenna above
the body of the camera, you will increase your operat­
ing range. If the antenna is laid next to the camera, as
shown in the illustration below, the body of the camera
will serve as a shield and reduce range. This position
may work but be certain at least part of the antenna
extends above the camera.
If dropouts occur in the field, moving the transmitter or
receiver slightly in any direction will usually eliminate
the problem.
LECTROSONICS, INC. 8