Lectrosonics UCR411a - Manual (Page 20)

UCR411A
LECTROSONICS, INC. 20
Pre-coordinated Frequencies
Interference from IM (intermodulation) is a potential
problem in all multi-channel wireless systems, so proper
frequency coordination is always required to avoid
noise, range and dropout problems. Your options to ac-
complish this include:
• Using the pre-coordinated frequency groups
• Performing a system checkout
(See Multi-channel System Checkout)
• Calling Lectrosonics for assistance
Groupings of compatible frequencies have been cre-
ated to minimize intermodulation problems in multiple
channel wireless systems. The frequencies can be used
with Digital Hybrid and analog Lectrosonics wireless
equipment. Compatibility with other brands is likely, but
not guaranteed by Lectrosonics.
Pre-coordinated fre-
quencies within each
block are arranged in
four groups (Grp) as
shown at right.
Example: Block 22
The uppermost eight
frequencies comprise
Grp a, the eight just
below them comprise
Grp b, and so on.
Grp a and Grp b are
compatible with one
another.
Grp c and Grp d are
compatible with one
another.
There is no assurance
that the upper 16 (a,b)
are compatible with the
lower 16 (c,d).
BLOCK 22
FREQ SW SET US TV CH
563.700 0,5 tv29
564.300 0,B tv29
565.200 1,4 tv29
565.800 1,A tv29
567.100 2,7 tv30
568.000 3,0 tv30
568.500 3,5 tv30
569.300 3,D tv30
575.700 7,D tv31
577.900 9,3 tv31
578.600 9,A tv32
579.900 A,7 tv32
581.700 B,9 tv32
582.600 C,2 tv32
585.200 D,C tv33
587.500 F,3 tv33
BLOCK 22
FREQ SW SET US TV CH
570.100 4,5 tv30
570.700 4,B tv30
571.600 5,4 tv30
572.200 5,A tv31
573.200 6,4 tv31
574.400 7,0 tv31
574.900 7,5 tv31
575.500 7,B tv31
581.100 B,3 tv32
582.100 B,D tv32
582.600 C,2 tv32
584.300 D,3 tv32
585.000 D,A tv32
585.600 E,0 tv32
586.300 E,7 tv32
588.100 F,9 tv32
Grp a
Grp b
Grp c
Grp d
NOTE: Pre-coordinated frequencies do not guard
against interference from outside sources.
When a pre-coordinated group is selected, it is still nec-
essary to check for interference from outside sources.
Groups a, b, c and d each store 8 frequencies. After
selecting one of these groups, step through each fre-
quency one at a time and check for interference before
trying to use the frequency.
To check for interference, set the frequency on the
receiver, then return to the Main Window and observe
the RF level indicator with the matching transmitter
turned OFF.
RF Level Indicator
Even a weak signal, as shown here, will have a sig-
nificant effect on operating range and dropouts. When
interference is present with the transmitter turned off, a
warning message will flash on the screen periodically.