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Blocking those unwanted signals

A filter is a great tool to either block unwanted frequencies from reaching your scanner, or only allowing a certain range of frequencies to pass to your receiver.  Depending on your needs the filter you require would change.

What you need to know

As the name implies, a filter will either allow or reject frequencies from passing through and onto your radio

In this session, we discuss:

  • High Pass & Low Pass Filters
  • Band Pass & Band Reject Filters
  • Common filter terms
  • Why we use filters
  • Where to install a filter
  • What to look for when buying a filter

Please support the Scanner School podcast.  Visit to see how you can help us.  Some of the ways you can support us won't cost you any additional money!


Links from this session:

Scanner School Resources Page

Purchase Filters here

Scanner Master

Scanner School Session 24 – ADS-B with Eric Carlson from FlightAware

Scanner School Session 33 – Multicouplers

Bonus Material:

Are you looking for your first scanner radio?

Download our new e-guide, “5 Thinks You Need to Know Before Buying Your First Scanner”.   This free PDF is about 30 pages long and has 5 things you should look for, plus a few extra bonus items to make sure you make an educated purchase.


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Podcast Transcription:

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