Lectrosonics Venue Series (Wideband) User Manual download pdf (Page 25)

Digital Hybrid Wireless™ Modular Receiver System

Rio Rancho, NM, USA

VRM

Jumpers set

towards the center

to enable antenna power

DC Power to UFM230 DC Power to UFM230

UFM230 UFM230

Long coax cabl e Long coax cabl e

AntennaAntenna

NOTE: The jumpers are set in the OFF position from the factory.

Location of Jumpers

Jumper positioned to

enable DC power

The Venue System is designed for rack mounting.

Although it can be operated with two whip antennas, it

is best to use remote antennas such as the SNA600 or

ALP Series for optimum reception. Position the remote

antennas at least three or four feet apart and not within

three or four feet of large metal surfaces. If this is not

possible, try to position the antennas so that they are as

far away from the metal surface as is practical. It is also

good to position them so that there is a direct “line of

sight” between the transmitter and the receiver anten-

nas.

In situations where the operating range is less than

about 100 feet, the antenna positioning is much less

critical. The length and type of cabling between anten-

nas and the system, however, is critical. Long cable

runs can experience serious signal loss. Lectrosonics

offers in-line RF ampliﬁers suitable for compensating for

this signal loss. 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

Antenna Use and Placement

Remote antennas can be placed

at a distance from the VRM to

optimize reception. To overcome

loss in long coaxial cable runs, a

Lectrosonics UFM Series inline

RFlter/ampshouldbepositioned

at the far end of the coaxial cable,

close to the antenna.

Powering Remote RF Ampliﬁers

With the ampliﬁer in this position, gain is applied ahead

of the loss to maximize the signal to noise ratio of the

antenna system.

Power for the UFM ampliﬁer can be supplied by the

Venue receiver through the coaxial cable by setting

jumpers on the main PC board toward the center of the

board as shown. Disconnect power and then remove

the top cover for access to the jumpers.

NOTE: It is best practice to enable this DC power ONLY

when a UFM remote ampliﬁer is used. Some anten-

nas may present a short to the power supply. While the

power supply is fused and it is unlikely that damage

would occur, it is always best to disable the DC when it

is not in use.

receiver’s antennas along with the direct signal. If the

direct and reﬂected signals are out of phase with each

other and similar in strength, a cancellation or “drop-

out” may occur. A dropout can sound like audible noise

(hiss, swishing or a “shhht” sound), or in severe cases,

may result in a complete loss of both the carrier and the

sound. Moving the transmitter even a few inches can

change the sound of the dropout, or may even eliminate

it. A dropout situation also may be either better or worse

as a crowd ﬁlls or leaves the room.

The Venue System offers several different diversity

reception methods which can overcome most dropout

problems. In the event, however, that you do encounter

a dropout problem, ﬁrst try moving one of the remote

antennas at least three or four feet from its current

location. If dropouts are still a problem, try moving the

antennas to entirely different locations.

Lectrosonics transmitters radiate power very efﬁciently,

and the receivers are very sensitive, which reduces

dropouts to an insigniﬁcant level. If, however, you do en-

counter dropouts frequently, call the factory or consult

your dealer. There is probably a simple solution.

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Lectrosonics Venue Series (Wideband) User Manual Page 25

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