Users Manual Part 2

Alarm ID
Descrip-
tion
Recovery
Action
Clear Ac-
tion
Notes
ure / configura-
tion problem.
ALM_EX_DC_1_875V_FAUL
T
Exciter DC
1.875V line
failure.
Transmitter
is disabled
by the soft-
ware - BRC
is unable to
transmit.
If the alarm
condition
disappears
then trans-
mitter is re-
enabled by
the software.
The alarm may
be reported be-
cause of some
power supply
problems (ca-
bles, connec-
tors) or the BRC
hardware fail-
ure / configura-
tion problem.
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 111: Recommended Test Equipment
Test Equipment Model Number Use
TETRA Signal Generator Rhode Schwarz:
SMU200A + SMU-
K68
Used for checking receive and transmit
operation.
TETRA Analyzer FSQ+FS-
K110+FSQ-K70
Dummy Load (50 Ω, 250
W)
Weinschel 453033 Used to terminate output
Service Terminal VT100 or compatible Local service terminal
Power Meter HP 437B Used to measure reflected and forward
power
RF Attenuator, 250 W, 40
dB
Weinschel 404043 Protection for HP89441A
RF Attenuator, 10 dB minimum 100 W Protection for HP89441A
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.
6802800U74-AP
Chapter 13: MTS Troubleshooting
422