Motorola MTR2000 T5544 Instruction / Field Service Manual page 309

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DESCRIPTION
Kits TYD4031/32/33 provide band-dependent duplexer modules for use with MTR2000 VHF stations. This sec-
tion provides a general description, identification of adjustments and inputs/outputs, performance specifications,
and typical connection. While the duplexer module is considered non-repairable, tuning screws are provided for
field tuning should replacement become necessary due to module failure, or if retuning is necessary due to a
change in operating channels. A single channel field tuning procedure is provided in this section.
General Description
Motorola Inc., 2005
All Rights Reserved
Printed in U.S.A.
VHF DUPLEXER MODULE
The duplexer module (shown in Figure 1) allows a transmit and receive
channel pair to share a common Tx/Rx antenna. Each duplexer module
consists of six resonant cavities (three for transmit and three for receive)
contained in a temperature-compensated copper enclosure designed to
mount in a standard EIA 48.26cm (19") equipment rack.
Each set of three cavities is designed and tuned to pass the respective
transmit or receive channel frequency (or bandwidths) while providing
maximum Tx noise suppression at the Rx frequency and maximum Rx iso-
lation at the Tx frequency.
Figure 1.
Government & Enterprise Mobility Solutions
1301 E. Algonquin Road, Schaumburg, IL 60196
Model TYD4031 (132 to 146 MHz)
Model TYD4032 (144 to 160 MHz)
Model TYD4033 (158 to 174 MHz)
Typical VHF Duplexer Module
68P81085E16-B
09/30/05-UP