Lectrosonics CR185 Manuel d'utilisateur télécharger pdf (Page 7)

ANTENNA USE AND PLACEMENT

Connect the antenna to the front panel jack. Position the antenna so that it is not within 3 or 4 feet of

large metal surfaces. If this is not possible, try to position the antenna so that it is 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 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 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. Moving the transmitter even a few inches

may 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.

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 operating 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. Alternate locations can include the back of the camera, the top of the camera or mounted

vertically on the side.

If dropouts occur in the field, moving the transmitter or receiver slightly in any direction will usually

eliminate the problem.

EXAMPLE MOUNTING LOCATIONS

FOR SINGLE OR MULTIPLE

CR185 RECEIVER(S)

Figure 4 - CR185 Mounting Locations

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Lectrosonics CR185 Manuel d'utilisateur Page 7