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6802800U74-AN
Chapter 13: MTS Troubleshooting
13.2.1.2
Recommended Test Equipment
The following table lists the recommended test equipment to perform the Base Radio troubleshooting/
station operation procedures.
Table 112: Recommended Test Equipment
Test Equipment
TETRA Signal Generator
TETRA Analyzer
Dummy Load (50 Ω, 250
W)
Service Terminal
Power Meter
RF Attenuator, 250 W, 40
dB
RF Attenuator, 10 dB
13.2.1.3
Troubleshooting Procedures
The Base Radio is computer-controlled and employs digital signal processing techniques. Many of the
troubleshooting and station operation procedures require Man-Machine Interface (MMI) commands.
These commands are used to communicate station level commands to the Base Radio through the
RS-232 communications port located on the front of the BRC.
The field maintenance philosophy for the Base Radio is to repair by replacement. The station is
comprised of self-contained Field Replaceable Units (FRU).
A defective FRU is replaced with a non-defective module. This method of troubleshooting limits down-
time and quickly restores the Base Radio back to normal operation.
Ship defective modules to a Motorola Solutions repair depot for repair.
This manual provides two troubleshooting procedures for the Base Radio. Each procedure is designed
to quickly identify faulty modules.
13.2.1.4
Routine Checkout
Procedure 1 is a quick, non-intrusive test performed during a routine site visit. Use this procedure to
verify proper station operation without taking the station out of service. The following figure shows the
Procedure 1 Troubleshooting Flowchart.
392
Model Number
Rhode Schwarz:
SMU200A + SMU-
K68
FSQ+FS-
K110+FSQ-K70
Weinschel 453033
VT100 or compatible
HP 437B
Weinschel 404043
minimum 100 W
Use
Used for checking receive and transmit
operation.
Used to terminate output
Local service terminal
Used to measure reflected and forward
power
Protection for HP89441A
Protection for HP89441A
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Troubleshooting
