Lectrosonics SRa Series - Manual (Page 21)

UHF Digital Hybrid Wireless ®
Rio Rancho, NM 21
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 frequencies
are arranged in four groups as
shown at right.
The uppermost eight
frequencies comprise Grp
a, the eight just below them
comprise Grp b, and so on.
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
Displa
yed as
“GR
OUP a”
thr
ough
“GR
OUP d”
in the LCD
and as
“Grp a”
thr
ough
“Grp d”
in
VRpanel Grp b
Grp c
Grp d
Compatibility follows the pattern illustrated in the dia-
gram at right.
Grp a and Grp b contain the 16 frequencies shown in
the table below (upper orange/white set).
Grp c and Grp d contain the 16 frequencies shown in
the table below (lower blue/white set).
NOTE: There is no assurance that frequencies
are compatible between the upper orange/white
set and the lower blue/white set. Combined use of
frequencies from both sets requires testing with
the procedures outlined in the following section
entitled Diagnostics - Multi-channel System
Checkout
These frequencies share RF spectrum with TV chan-
nels. TV station broadcast signals are much more
powerful than a wireless microphone transmitter, and
can easily mix with the signals from the wireless system
to produce a variety of interference problems. Even if
these pre-coordinated frequencies are being used, it is
always a good idea to go through the checkout proce-
dure on the following page.
Active TV station signals can be discovered by scanning
with the receiver, or researched in advance on this web
site: www.fccinfo.com.
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5 tv39 646.900 4,5 tv43
621.900 4,B tv39 647.500 4,B tv43
622.800 5,4 tv39 648.400 5,4 tv43
623.400 5,A tv39 649.000 5,A tv43
624.400 6,4 tv39 650.000 6,4 tv43/44
625.600 7,0 tv39 651.200 7,0 tv44
626.100 7,5 tv40 651.700 7,5 tv44
626.700 7,B tv40 652.300 7,B tv44
632.300 B,3 tv41 657.900 B,3 tv45
633.300 B,D tv41 658.900 B,D tv45
633.800 C,2 tv41 659.400 C,2 tv45
635.500 D,3 tv41 661.100 D,3 tv45
636.200 D,A tv41 661.800 D,A tv45
636.800 E,0 tv41 662.400 E,0 tv46
637.500 E,7 tv41 663.100 E,7 tv46
639.300 F,9 tv42 664.900 F,9 tv46
All 16 within the
same block are
compatible
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5 tv39 646.900 4,5 tv43
621.900 4,B tv39 647.500 4,B tv43
622.800 5,4 tv39 648.400 5,4 tv43
623.400 5,A tv39 649.000 5,A tv43
624.400 6,4 tv39 650.000 6,4 tv43/44
625.600 7,0 tv39 651.200 7,0 tv44
626.100 7,5 tv40 651.700 7,5 tv44
626.700 7,B tv40 652.300 7,B tv44
632.300 B,3 tv41 657.900 B,3 tv45
633.300 B,D tv41 658.900 B,D tv45
633.800 C,2 tv41 659.400 C,2 tv45
635.500 D,3 tv41 661.100 D,3 tv45
636.200 D,A tv41 661.800 D,A tv45
636.800 E,0 tv41 662.400 E,0 tv46
637.500 E,7 tv41 663.100 E,7 tv46
639.300 F,9 tv42 664.900 F,9 tv46
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5 tv39 646.900 4,5 tv43
621.900 4,B tv39 647.500 4,B tv43
622.800 5,4 tv39 648.400 5,4 tv43
623.400 5,A tv39 649.000 5,A tv43
624.400 6,4 tv39 650.000 6,4 tv43/44
625.600 7,0 tv39 651.200 7,0 tv44
626.100 7,5 tv40 651.700 7,5 tv44
626.700 7,B tv40 652.300 7,B tv44
632.300 B,3 tv41 657.900 B,3 tv45
633.300 B,D tv41 658.900 B,D tv45
633.800 C,2 tv41 659.400 C,2 tv45
635.500 D,3 tv41 661.100 D,3 tv45
636.200 D,A tv41 661.800 D,A tv45
636.800 E,0 tv41 662.400 E,0 tv46
637.500 E,7 tv41 663.100 E,7 tv46
639.300 F,9 tv42 664.900 F,9 tv46
The upper eight are
compatible with the
lower eight in the
adjacent blocks.
The lower eight are
compatible with the
upper eight in the
adjacent blocks.