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SESK: Stuff Everyone Should Know · sesk.info/ham-directional-wattmeter-swr

Which instrument can be used to determine SWR?

A directional wattmeter can determine SWR.

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  1. A directional wattmeter ✔
  2. A voltmeter
  3. An ohmmeter

Why: A directional wattmeter measures forward power and reflected power separately. Comparing the two gives you the SWR.

Huh, didn't know that: Iambic pentameter is a poetic meter, not an electrical measuring instrument.

The dad joke
I measured my SWR with iambic pentameter. The results were poetic but useless.
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References

Answer: A directional wattmeter. A directional wattmeter measures forward power and reflected power separately. Comparing the two gives you the SWR.

  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. Directional wattmeter
    Checked 2026-10-09.

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