SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-filter-at-affected-receiver

What might reduce out-of-band overload in a neighbor's over-the-air radio or TV?

A filter at the affected receiver's antenna input blocks the ham signal.

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  1. A filter at the antenna input of their receiver ✔
  2. Switching your transmitter from FM to SSB
  3. Switching to a narrow-band mode

Why: When a receiver is overloaded, a filter at its antenna input blocks your strong signal and lets its own stations through. Changing your mode doesn't stop overload.

Huh, didn't know that: The fix often goes on the affected receiver because its weak filtering is what lets your signal in.

The dad joke
The TV and I had a disagreement. A filter helped us both see clearly.
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References

Answer: A filter at the antenna input of their receiver. When a receiver is overloaded, a filter at its antenna input blocks your strong signal and lets its own stations through. Changing your mode doesn't stop overload.

  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
    A. Block the amateur signal with a filter at the antenna input of the affected receiver
    Checked 2026-10-09.

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