User's Manual

DIB-500 R4.1 Function tests and operating surveillance
Checking external antenna coupling systems
162 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 – 99.1
7.7 Checking external antenna coupling systems
The operator alone is responsible for checking external antenna coupling systems,
insofar as this is not a contractual component of the Rohde & Schwarz Professional
Mobile Radio GmbH. An appointed installer of the antenna coupling system is responsi-
ble for conducting all the necessary measures and for compliance with the correspond-
ing specifications.
Table 7.11 GPS module – Fault analysis
No. Possible cause(s) Required measure(s)
1 Badly positioned GPS antenna or a GPS con-
necting cable that is too long and with exces-
sive attenuation.
Perform the following measures:
1. Check whether messages 4 and 5 are visualised in addi-
tion to messages 1 and 2, see Table 7.10 on page 162.
In this case, first perform the required measures for
messages 4 and 5.
2. Ensure that the voltage supply is switched off.
3. Check the following properties:
– Installation location of the GPS antenna
– Damage of the GPS antenna and the GPS connect-
ing cable
– Length of the GPS connecting cable
4. If necessary, change the installation site of the GPS
antenna and/or replace the corresponding components.
5. Restart the PUC software component.
6. Check whether messages are still being visualised.
7. Send the TIB transceiver module in for repair services if
the messages 1 and 2 are still being visualised.
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3 GPS module defective Perform the following measures:
1. Check whether other messages are visualised in addi-
tion to message 3, see Table 7.10 on page 160. In this
case, first perform the required measures for these mes-
sages.
2. Check whether messages are still being visualised.
3. Send the TIB transceiver module in for repair services if
message 3 is still being visualised.
4 | Short circuit on the GPS antenna con-
nection caused by:
– damaged GPS antenna
– damaged GPS antenna connecting
cable
– damaged GPS protector
| Overvoltage at the GPS antenna connec-
tion, e.g. due to lightning strike
The voltage supply for the GPS antenna in
the GPS module features a short-circuit mon-
itoring. In case of malfunctions, the PUC
switches the voltage supply for the GPS
antenna and the GPS module off. As a result,
messages 1, 2 and 3 are also being reported.
In this case, the PUC must be restarted to re-
establish the voltage supply after the fault
analysis has been performed.
Perform the following measures:
1. Ensure that the voltage supply is switched off.
2. Check the following properties:
– Damage of the GPS antenna and the GPS connect-
ing cable
– Length of the GPS connecting cable
3. Check the optional GPS protector:
– Remove the optional GPS protector, refer to
section 11.10.1 on page 222.
– Connect the GPS antenna cable directly to the GPS
antenna connector on the equipment rack, refer to
section 5.10 on page 119.
– Check whether messages are still being visualised.
4. If necessary, replace the corresponding components.
5. Restart the PUC software component.
6. Check whether messages are still being visualised.
7. Send the TIB transceiver module in for repair services if
the messages 4 and 5 are still being visualised.
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