Nautel NX25, Operation And Maintenance Manual

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NX300 Operations and Maintenance Manual Routine maintenance
Issue 3.0 2012-11-01 Page 3-3
3. Unpack the new filter and inspect it for damage.
4. Remove the old filter.
5. Apply filter coat spray (originally supplied with the transmitter) to the replacement filter.
6. Insert the new air filter into the bracket, with the sprayed side facing you.
7. Dispose of the damaged air filter.
Performing on-air checks
You should check the on-air quality of the transmitter’s signal periodically. This check can be done
locally at the transmitter site, or remotely from another location in the transmitter’s coverage area.
Interval
Every 12 months, or as required by law.
Parts and tools
• High-quality receiver compatible with the modulation scheme used on the transmitter.
Procedure
1. Monitor the transmitter signal to identify any problems:
– Use a high quality receiver to monitor audio quality.
– Check the spectral output of the transmitter using the front panel AUI’s spectrum
analyzer.
– Take a portable receiver to different locations in your coverage areas to identify any
problems with the antenna pattern or areas of localized interference.