Lectrosonics UCR511 - Manual (Page 20)

UCR511
frequencies in Row 2 Block 21 are compatible. However,
frequencies in Row 1, Block 21 are not compatible with
the frequencies in Row 2, Block 21. If possible, it is
highly recommeneded to choose frequencies that are in
the same row and same group. For example, stick with
frequencies in Row 1 Group A, or Row 2 Group D rather
than choosing frequencies from Row 1 Groups A and B.
Rule No. 3
Some frequencies in adjacent blocks are compatible and
some are not. Refer to the illustration to the left which
shows compatible and incompatible frequency relation­
ships.
By following the three rules, it is possible to locate a
number of potential clear operating frequencies early in
the production that are intermodulation free, then refine
the list during system setup.
Using the Scan Function
Refer to the section titled "Frequency Scan Mode" for
details on how to use the built-in spectrum scanner.
Interference can result from a wide variety of sources
including TV station signals and other wireless equip­
ment in use nearby. The RF spectrum analyzer built into
the UCR511 scans the frequency block to identify
channels with little or no interference. After scanning
and finding the needed number of clear channels, one
final procedure is necessary to verify the compatibility of
the chosen frequencies.
Turn on all transmitters and receivers used for the
program and verify there is a strong RF signal for each
receiver. Turn each transmitter off one at a time and
observe the RF level indicator on the matching receiver.
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.
Any time a frequency is changed on any of the systems
in use, you must start at the beginning and go through
this procedure for all systems. This will test for higher
order imtermodulation from all signal sources and avoid
interference.
Call Lectrosonics
Lectrosonics uses a proprietary computer program to
perform thousands of calculations and identify various
interfering signals. Potential problems and trouble areas
can be identified in advance, and proposed new frequen­
cies or other solutions can be suggested. This service is
offered to authorized Lectrosonics dealers and other
customers who are using LECTRO
™ or Lectrosonics ®
wireless microphone and wireless IFB systems.
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