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SESK: Stuff Everyone Should Know · sesk.info/ham-coax-loss-sources

Which group lists three sources of coaxial feed-line loss?

Water intrusion, high SWR, and multiple connectors can all add loss.

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  1. Only low SWR and one connector
  2. Dry connectors and proper matching
  3. Water intrusion, high SWR, and many connectors ✔

Why: Water damages cable performance, high SWR increases effective feed-line loss, and each connector can add some loss. Good installation reduces all three problems.

Huh, didn't know that: Weatherproofing outdoor connectors helps keep moisture out of coax.

The dad joke
The coax disliked rain because water made the signal feel drained.
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References

Answer: Water intrusion, high SWR, and many connectors. Water damages cable performance, high SWR increases effective feed-line loss, and each connector can add some loss. Good installation reduces all three problems.

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 errata) ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    A. Water intrusion into coaxial connectors B. High SWR C. Multiple connectors in the line D. All these choices are correct
    Checked 2026-10-09.

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