Lectrosonics R400 - Manual (Page 18)

R400
Rule No. 2
Frequencies within an individual frequency block in the
same row are compatible. For example, all 16 frequen­
cies within Row 1, Block 21 are compatible, and all
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 Scan section for details on how to use the
built-in spectrum scanner.
Interference can result from a wide variety of sources
including TV station signals, other wireless equipment in
use nearby, or from intermodulation within the Venue
system itself. The RF spectrum analyzer built into the
R400 system scans the tunable spectrum to find clear
channels with little or no interference. After scanning
and finding a clear channels, one final procedure is
necessary to verify the compatibility of the chosen
frequencies.
Turn on the associated transmitter verify there is a strong
RF signal. Turn off the transmitter observe the RF level
indicator. The RF level should disappear or drop to a
very low level. If it does not, change frequency on the
receiver and transmitter and try it again.
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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