SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-shielded-wire-purpose

What is a reason to use shielded wire?

To keep unwanted signals from coupling to or from the wire.

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  1. To keep unwanted signals from coupling to or from it ✔
  2. To lower the resistance of DC power connections
  3. To let the wire carry more current

Why: Shielded wire wraps its conductor in a metal braid or foil. The shield keeps outside signals from getting in and keeps the wire's own signals from leaking out.

Huh, didn't know that: Coaxial cable, the usual ham feed line, is a kind of shielded wire.

The dad joke
Why did the wire wear a shield? It was tired of picking up bad vibes.
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References

Answer: To keep unwanted signals from coupling to or from it. Shielded wire wraps its conductor in a metal braid or foil. The shield keeps outside signals from getting in and keeps the wire's own signals from leaking out.

  1. NCVEC 2026-2030 Technician Question Pool, T6D03 ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    C. To prevent coupling of unwanted signals to or from the wire
    Checked 2026-10-09.

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