NV30/NV40 Operations and Maintenance Manual Routine maintenance
Issue 3.3 2014-12-10 Page 3-5
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.
2. Obtain the Critical Parameters sheet that was completed during factory testing and provided
with the transmitter. Use the transmitter’s AUI to compare current transmitter settings with
those on the Critical Parameters sheet.
Note:
Nautel completes the Critical Parameters sheet with the transmitter terminated into a precision 50
ohm load. Measurements made on site into a dummy load or station antenna may not yield the same
readings. Slight variances are acceptable. The data is provided as a troubleshooting aid.
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