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Appendix H: Viavi CX300 Tests
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Figure H-17: RSS Receiver Reference Oscillator
Alignment
In the receiver RSS, enter the Service section and click on “Ref Oscillator”. The reference oscillator frequency is
shown as the “Target Synthesizer RF OUT”. Enter this RF frequency into the frequency on the CX300. The receiver
generates this frequency out of the Synthesizer into the CX300.
Monitor the RF Error on the CX300. To change the reference frequency, adjust the softpot slider in the RSS as
shown in Figure H-17. Adjust until the RF Error is as close to 0 Hz as possible. Click on the “Program” button to
program in the new Reference Oscillator softpot value.
Enter the L.O. Reference Oscillator Offset reading on the MT-4E Test Sheet.
