Lectrosonics UCR411 User Manual download pdf (Page 11)

UHF Wireless Digital Hybrid

Receiver

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 3 or 4 feet of

large metal surfaces. If this is not possible, try to posi-

tion 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” be-

tween 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.

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 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 at least 3 or 4 feet

from where it was. 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 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

Rio Rancho, NM – USA

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Lectrosonics UCR411 User Manual Page 11

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