SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-band-reject-filter-fm-station

What can reduce interference to a 2-meter radio from a nearby commercial FM station?

A band-reject filter blocks the strong FM station.

Start playing free

  1. An RF preamplifier
  2. Double-shielded coaxial cable
  3. A band-reject filter ✔

Why: A band-reject filter blocks a narrow range of frequencies and passes the rest. A preamplifier would only boost the unwanted signal too.

Huh, didn't know that: The band-reject filter goes in the receive path rather than acting as a preamplifier.

The dad joke
The band-reject filter is the bouncer of the radio world. Your name's not on the list, you're not getting in.
Like this card?
Play the game

References

Answer: A band-reject filter. A band-reject filter blocks a narrow range of frequencies and passes the rest. A preamplifier would only boost the unwanted signal too.

  1. NCVEC 2026-2030 Technician Question Pool (February 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    D. Installing a band-reject filter
    Checked 2026-10-09.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Ham RadioWhat might reduce out-of-band overload in a neighbor's over-the-air radio or TV?Ham RadioWhich of these is prohibited for amateur radio operators?Ham RadioWhat must U.S. amateurs do in a secondary band segment?

That's stuff everyone should know.