User's Manual

SRc5P and SRc Dual Receivers
LECTROSONICS, INC.
26
Pre-coordinated Frequencies
About Frequency Coordination
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
• Scanning with the receiver and performing a sys-
tem checkout (See Multi-channel System Checkout)
• Contacting 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.
These frequencies have been calculated to minimize IM
between these frequencies only, however, RF signals
from outside sources can still interfere with operation.
So, even if only these pre-coordinated frequencies are
being used, a Multi-channel System Checkout should
be conducted. See the procedure on the next page.
The eight frequencies in each of the four groups are
generally compatible for simultaneous use.
Special Notes on Block 23
The block 23 frequency range includes the spectrum
from 608 through 614 MHz that is allocated for radio
astronomy (radio telescopes) which is blocked from
use in the US. The SRc Series receivers are tested and
compliant with the technical standards in the US and
Europe, so frequencies can be selected in the 608 to
614 MHz range. US model transmitters, on the other
hand, will not tune to frequencies in this range.
European model transmitters, which include “E01” in the
model number, will operate within the 608 to 614 MHz
band. Be certain that the COMPAT (compatibility) mode
is set to match the transmitter model and COMPAT
mode.
NOTE: See page 22 for information on the
compatibility modes.
NOTE: As the spectrum has become more congested,
interference from external sources has become
common. As a result, the frequencies provided in these
pre-coordinated groups may or may not be 100%
usable in some locations. Interference from external
sources may appear as direct signals, or may mix with
the pre-coordinated frequencies and generate new RF
signals through IM (intermodulation).
BLOCK 22
FREQ SW SET US TV CH
563.700 0,
5t
v29
564.300 0,
Bt
v29
565.200 1,
4t
v29
565.800 1,
At
v29
567.100 2,
7t
v30
568.000 3,
0t
v30
568.500 3,
5t
v30
569.300 3,
Dt
v30
575.700 7,
Dt
v31
577.900 9,
3t
v31
578.600 9,
At
v32
579.900 A,
7t
v32
581.700 B,
9t
v32
582.600 C,
2t
v32
585.200 D,
Ct
v33
587.500 F,
3t
v33
BLOCK 22
FREQ SW SETUS TV CH
570.100 4,
5t
v30
570.700 4,
Bt
v30
571.600 5,
4t
v30
572.200 5,
At
v31
573.200 6,
4t
v31
574.400 7,
0t
v31
574.900 7,
5t
v31
575.500 7,
Bt
v31
581.100 B,
3t
v32
582.100 B,
Dt
v32
582.600 C,
2t
v32
584.300 D,
3t
v32
585.000 D,
At
v32
585.600 E,
0t
v32
586.300 E,
7t
v32
588.100 F,9 tv32
Grp a
Grp b
Grp c
Grp d
Selecting the Frequency Block
The SRc Series wideband receivers tune across three
frequency blocks. In order to select one of the pre-coor-
dinated groups in a particular block, start by manually
tuning the receiver to the desired block or to a frequen-
cy within that block, then select the TUNING group.
BAND A1
BLOCK FREQ RANGE
470* 470.100 - 495.600
19* 486.400 - 511.900
20 512.000 - 537.500
BAND B1
BLOCK FREQ RANGE
21 537.600 - 563.100
22 563.200 - 588.700
23 588.800 - 614.300
*IMPORTANT NOTE:
Blocks 470 and 19 overlap each other. Make certain
that BOTH FREQUENCY AND BLOCK match the
transmitter being used. The hex codes are different for
the same frequency in blocks 470 and 19. This means
that the pilot tones are also different, so the squelch
will not open unless the correct block is selected.
Pre-coordinated frequencies
are arranged in four groups
as shown in this example of
block 22.
The receiver LCD displays the
current settings.
1
22 : 1A
565.800
a
Selected
receiver
Block
Hex code
Group Frequency