SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-ferrite-choke-mic-cable

What can eliminate distorted voice transmissions caused by RF feeding back into the transmitter?

A clip-on ferrite choke on the mic cable.

Start playing free

  1. A clip-on ferrite choke on the mic cable ✔
  2. Extra feed line to lower the SWR
  3. Turning the squelch fully clockwise

Why: Your own signal can travel back along the mic cable and garble your audio. A ferrite choke blocks that RF but lets your voice through.

Huh, didn't know that: Ferrite chokes are the little lumps you see near the ends of many computer and charger cables.

The dad joke
Why did the mic cable wear a ferrite choke? It was a fashion statement with a purpose.
Like this card?
Play the game

References

Answer: A clip-on ferrite choke on the mic cable. Your own signal can travel back along the mic cable and garble your audio. A ferrite choke blocks that RF but lets your voice through.

  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
    C. Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter
    Checked 2026-10-09.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Ham RadioWhat can you do if you are told your FM radio is over-deviating?Ham RadioWhich of the following causes failure of coaxial cables?Ham RadioWhat is the characteristic appearance of a cold tin-lead solder joint?

That's stuff everyone should know.