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Appendix H: Viavi CX300 Tests
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
On the CX300, load Zetron preset 03 Rx Preselector Tune from your internal drive. Enter the correct RF frequency
as the Center Freq and ensure the receiver is turned on. The filter waveform should appear as shown in Figure
H-12�
Figure H-12: Receiver RF Preselector
To tune the RF Preselector filter, remove the dust caps on the variable capacitors and, starting from the
capacitor closest to the front panel of the receiver and moving back, tune the filter to its new frequency.
