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APPENDIX G: VIAVI 8800 TEST PROCEDURES
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Receiver Bit Error Rate Testing
On the 8800, ensure that the NAC is set to $293. The receiver does not need to be programmed to this NAC for
the BER test.
In the receiver RSS, enter the Service section and click on “Bit Error Rate”. The receiver frequency should
automatically be shown in the frequency box. Select the Test Type to “Continuous” and Avg. Superframes to
“8”. Click on the “Start Test” button to start the BER test. You should get 0% BER at the -70 dBm default RF carrier
level�
Monitor the BER reading while slowly reducing the RF carrier level as shown in Figure G-12. The 5% BER point
should be at an RF carrier level less than the specified Digital Sensitivity point of the receiver
Figure G-12: RSS Receiver Bit Error Rate Test
Enter the Reference Sensitivity (5% BER) reading on the MT-4E Test Sheet.
If the BER measurements are not within Zetron published specifi cations, the RF Preselector may need re-
alignment. Refer to the Receiver RF Preselector Alignment and Tuning section.
