Weekly Tech Reminders: Online Public Files, DSP, Wireless Mics & More

An excerpt from this week’s Monday Morning Coffee and Technical Notes
Publish date:

The following is excerpted from the�Alabama Broadcasters Association�s�weekly e-newsletter, Monday Morning Coffee and Technical Notes. Thanks to Larry Wilkins, who puts together the content and has shared it with Radio magazine readers. To subscribe to the newsletter, send an email to�lwilkins@al-ba.com, and he will add you to the database.


Engineers should be proactive and remind their management/operational people that the deadline for all radio stations to place their public files online is coming up in a few months.� The actual date that the files must be posted is March 1, 2018, however stations may place the files online at any time before that date.� A good number of stations already have uploaded their Public Files.

Simply put, the online files work just like the file drawer at your station, with various folders loaded with the correct information.� To view the online system visit publicfiles.fcc.gov. In the search bar enter a station call (example WSB).� Walk around the different tabs to see the information that has been loaded.

One of the important items is that most of the documents will be loaded in the file by the Commission (any such documents that are normally file with the FCC will be preloaded on the site).� Other files such as issues and programs, annual EEO reports, and certain political files will be uploaded by the station.

Read a detail of the online file requirements here.�


Digital Signal Processing is something that is constantly in use not only our broadcasting plants but our homes, cars, cell phones, tablets and computers.

It is so common we often take it for granted.� But do we really know what they do?

Digital Signal Processors (DSP) take real-world signals like voice, audio, video, temperature, pressure, or positions that have been digitized and then mathematically manipulate them. A DSP is designed for performing mathematical functions like "add", "subtract", "multiply" and "divide" very quickly.

We recently came across a really great tutorial on DSP.� Click here to learn more about DSP.


Chris Huff in his latest blog reminders us that some companies are still selling wireless equipment in the 608 - 698 MHz range. We've got places in the USA that can't even use that range any more, not to mention the FCC ban that goes into effect in 2020. So why are these companies still selling them? Well, online sales are global so other countries can still use them.�� So, if you're looking at a new wireless system and you're in the USA, make sure the microphones are using frequencies OUTSIDE of the 608 - 698 MHz range.

Visit Chris Huff's website here.


If you are involved in a LPFM operation, remember that FCC rules indicate LPFM stations will be authorized to operate with maximum facilities of 100 watts ERP at 30 meters HAAT. An LPFM station with a HAAT that exceeds 30 meters will not be permitted to operate with an ERP greater than that which would result in a 60 dBu contour of 5.6 km.

Also LPFM stations may not operate with facilities less than 50 watts ERP at 30 meters HAAT or the equivalent necessary to produce a 60 dBu contour that extends at least 4.7 km.