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Where are PL-259 coax connectors commonly used?

PL-259 connectors are common at HF and VHF frequencies.

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  1. Microwave frequencies only
  2. HF and VHF frequencies ✔
  3. Watertight outdoor joints only

Why: PL-259 connectors are widely used for HF and VHF station connections. They are not naturally watertight and are not preferred for microwave work.

Huh, didn't know that: The mating chassis connector is commonly called an SO-239.

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The PL-259 stayed connected because it hated loose conversations.
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References

Answer: HF and VHF frequencies. PL-259 connectors are widely used for HF and VHF station connections. They are not naturally watertight and are not preferred for microwave work.

  1. NCVEC 2026-2030 Technician Question Pool www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    C. They are commonly used at HF and VHF frequencies
    Checked 2026-10-09.

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