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Radio
Broadcast Technical Consulting and Sales |
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Working in the field Occupied Bandwidth Measurements |
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As a part of our work, we do FCC required
annual occupied bandwidth and RF harmonic measurements reports for AM
stations on an annual basis. The FCC allows a maximum of 14 months
between measurements, making the assumption that an attempt was made at the
one year anniversary and it may take some time to do necessary repairs to
stay in compliance. An example of this was at WJON in St. Cloud, MN,
when a new station moved to town and caused mixing products in the existing
WJON transmitter. See:
http://mwpersons.com/engineer's-log/2009/11-20-09-wjon-filter.htm
We use an Agilent N9340B as the primary field instrument, which replaced an IFR A7550. The IFR is now used in the shop to verify performance of STL (studio transmitter link) and RPU (remote pickup) transmitters. |
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Here is a wider spectrum
analyzer view of the same AM transmitter from above. We do similar
measurements on FM and
FM
HD stations as required by the FCC. Whether it is AM or FM,
measurements to confirm compliance with FCC rules are required whenever
something is changed in the equipment lineup that can affect transmitted
bandwidth. That includes changing a transmitter or audio processing.
In the case of an FM station, it could also be replacement of a composite
STL or FM exciter. The work is done on a time and material basis plus $100 to write the FCC acceptable report. See our rate card. |
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Questions?
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page last edited 04/09/2010
