Lectrosonics R175 - Manual (Page 5)

Compact Receiver
ANTENNA USE AND PLACEMENT
Connect the antenna to the rear panel jack. Extend the antenna fully if you are using a telescoping type. Position the
antenna so that it is not touching or within 3 or 4 feet of large metal surfaces. It is also good practice to position the
receiver so that there is a direct “line of sight” between the transmitter and the receiver antenna. If the antenna needs
to placed away from the receiver, use a proper external antenna. Use of the supplied whip antenna on the end of a
coax cable with no ground plane is not recommended and may result in poor RF performance.
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 sound when the
transmitter is positioned in certain locations in the room. A dropout normally sounds like “hum” or “hiss.” Moving the
transmitter even a few inches will change the sound of the hum or hiss, or eliminate it. A dropout situation may be
either better or worse as the crowd fills and/or leaves the room.
In the event that you do encounter a dropout problem, first try moving the receiver/antenna at least 3 or 4 feet from
where it was. This may alleviate the dropout problem. If dropouts are still a problem, try moving the receiver and/or
the antenna to an entirely different location in the room.
Lectrosonics transmitters radiate more power, and the receivers are more sensitive than any other on the market.
This reduces dropouts to an insignificant level. If, however, you do encounter dropouts frequently, call the factory.
There is probably a simple solution.
REFLECTIVE SURFACE
INDIRECT SIGNAL
TRANSMITTER
PHASE
CANCELLATION
LECTROSONICS
RECEIVER
INDIRECT SIGNAL
DIRECT SIGNAL
MULTI-PATH DROPOUT
Rio Rancho, NM – USA 5