Lectrosonics CR187 User Manual download pdf (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.

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Lectrosonics CR187 User Manual Page 8