Lectrosonics Venue 3.9 - Manual (Page 24)

Venue
Multi-channel System Checkout
Interference can result from a wide variety of sources
including TV station signals, other wireless equipment
in use nearby, or from intermodulation within a multi­
channel wireless system itself. Regardless of how the
frequencies were coordinated, a final checkout proce­
dure is always a good idea.
The pre-coordinated frequencies on the chart on the
previous pages address in-system intermodulation,
but obviously do not take into account RF signals from
external sources that may be present in the location
where the system will be operating. The procedure out­
lined below is necessary to check for interference from
external sources.
Scanning with the RF spectrum analyzer built into the
Venue system will identify external RF signals, but
it does not address the compatibility of the selected
frequencies. After scanning and finding the needed
number of clear channels, the following procedure is
necessary to check the compatibility.
1. Set up the system for testing. Place antennas in
the position they will be used and connect to the
receivers. Place transmitters about 3 to 5 feet apart,
about 25 to 30 feet from the receiver antennas. If
possible, have all other equipment on the set, stage
or location turned on as well, especially any mixing
or recording equipment that will be used with the
wireless system.
2. Set all receivers on clear channels.
Turn on all receivers, but leave the transmitters off.
Look at the RF level display on each receiver. If
an indication is present, change the frequency to
a clear channel where no signal is indicated. If a
completely clear channel cannot be found, set it for
the lowest RF level indication. Once all receivers on
on clear channels, go to step 2.
3. Turn each transmitter on one at a time. Leave
the other transmitters turned off. Then, as you turn
on each one, look at the matching receiver to verify
a strong RF signal is received. Then, look at the
other receivers and see if one of them is also pick­
ing up the signal. Only the matching receiver should
indicate a signal. Change frequencies on either
system slightly until it will pass this test, then check
again to see that all receivers are still on clear
channels as in Step 2.
4. Turn each transmitter off one at a time. With all
transmitters and receivers turned on, turn each
transmitter off one at a time and look at the RF level
indicator on the matching receiver. It should “fall
silent” and the RF level should disappear or drop to
a very low level. If it does not, change frequency on
that receiver and transmitter and try it again.
IMPORTANT: Any time a frequency is changed on
any of the systems in use, you must start at the
beginning and go through this procedure again for
all systems. With a little practice, you will be able
to do this quickly and save yourself some “multi­
channel grief.”
LECTROSONICS, INC. 24