Motorola MTR2000 T5544 Instruction / Field Service Manual page 296

6
FUNCTIONAL THEORY OF OPERATION
The following theory of operation describes the operation of the Antenna Relay Module at a functional level. The
information is presented to give the service technician a basic understanding of the functions performed by the
module in order to facilitate maintenance and troubleshooting to the module level. Refer to Figure 7 for a block
and interconnect diagram of the Antenna Relay Module.
Note
Receiver
Module
Figure 7.
68P81096E41-D
09/30/05
The Antenna Relay Module contains a relay with a set of normally open
and normally closed contacts. The relay coil is controlled by the Antenna
Relay signal from the Station Control Module to connect either the Receiv-
er Module or the Power Amplifier Module to a single transmit/receive an-
tenna.
With the relay de-energized, the antenna is connected to the Receiver
Module. To connect the antenna to the Power Amplifier Module, the Sta-
tion Control Module must energize the relay (one side of which is connect-
ed to +14.2 Vdc) by grounding the Antenna Relay signal.
N.C.
Antenna Relay
Module
2-wire
Control
Cable
Functional Block and Interconnect Diagram for Antenna Relay Module
Antenna
N.O.
+ –
Antenna Relay
+14.2 Vdc
Antenna Relay Module
Power
Amplifier
Module
Mates With
3-pin Connector (P10)
On Backplane
9