User's Manual

Venue 2 Wideband Receiver
LECTROSONICS, INC.
22
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.
Scanning with the RF spectrum analyzer built into the
Venue 2 system will identify external RF signals, but
it does not address the compatibility of the selected
frequencies.
Wireless Designer software provides an excellent
frequency coordination function that integrates scan
data and carriers into the calculations. The results are
highly reliable, but if time allows, it is also a good idea
to conduct a final test with the following procedure.
1. Set up the system for testing.
Place antennas in the position in which 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. Observe at the RF signal strength indicator
for each receiver module. If a signal is present,
change the frequency to a clear channel where
no signal is indicated. If a completely clear chan-
nel cannot be found, select the frequency with
the lowest RF level indication. Once all receiver
modules are on clear channels, go to step 3.
3. Turn each transmitter on one at a time.
Start with all transmitters turned off. 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
picking up the signal. Only the matching receiver
should indicate a signal. Change frequencies on
either system slightly until all channels pass this
test, then check again to see that all channels are
still clear as done 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, in turn, and
look at the RF level indicator on the matching
receiver module. 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. When a clear frequency is found, turn the
transmitter on and move on to the next channel.
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 wave yourself some
grief.