Antennas; Use And Placement; Using Remote Antennas - Lectrosonics Venue 2 Installation Manual

Venue 2 Wideband Receiver

Antennas

Use and Placement

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
antennas.
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 significant signal loss. Lectroson-
ics offers in-line RF amplifiers to compensate for this
signal loss. Contact your dealer or the factory for more
information.
A wireless transmitter sends a radio signal out in all di-
rections. This signal will often bounce off nearby walls,
ceilings, etc. and a strong reflection can arrive at the
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 bet-
ter 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
encounter dropouts frequently, call the factory or con-
sult your dealer. There is probably a simple solution.
22

Using Remote Antennas

Remote antennas can be placed at a distance from
the receiver to optimize reception. To overcome loss
in long coaxial cable runs, a Lectrosonics UFM Series
inline RF filter/amp should be positioned at the far end
of the coaxial cable, close to the antenna.
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
antennas 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.
LECTROSONICS, INC.