User's Manual

Analogue Paging
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 54 of 134
8.4 Configuration
The recommended configuration sequence is:
1. Ensure the PTX is equipped to support Analogue Paging: “ATM25” should return ‘1’
2. Enable Analogue Paging capability: “ATM26=1”
3. Pull “Digital/Analogue Mode Select” (LIU Pin 13) low to enable the analogue (not digital) datapath.
4. Inject a 1kHz reference tone of amplitude corresponding to the desired deviation frequency
5. Perform the relevant initiation action
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:
a. Press the “Calibrate” button OR
b. Modify the Deviation frequency OR
c. Modify the Deviation Limiter frequency.
6. The unit will undergo self-calibration, reporting success/failure on completion.
8.5 Faults and Alarms
Whenever calibration fails, an “Audio Calibration Failure” (refer to Appendix E) fault is triggered and the red
“FAULT” LED on the front panel will illuminate. This fault can be cleared as per any other and it does not in
turn trigger any other (e.g. protective/remedial) action.
No alarms have been configured with regard to Analogue Paging.
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If you suspect you may not have the means to connect to the PTX via either its RS-232 serial or Ethernet
ports at deployment time, please contact STI in advance so that we can deliver your unit with the correct
Deviation and Deviation limiter frequencies (amongst other settings) pre-configured.