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SESK: Stuff Everyone Should Know · sesk.info/hame-arq-error-correction

How does ARQ accomplish error correction?

It asks for a retransmission when errors are detected.

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  1. Special binary codes correct errors automatically
  2. Redundant data is substituted for bad data
  3. If errors are detected, a retransmission is requested ✔

Why: ARQ stands for automatic repeat request. The receiver checks the data and, if something is wrong, tells the sender to try again.

Huh, didn't know that: Symbol rate and baud are the same thing (E8C11).

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References

Answer: If errors are detected, a retransmission is requested. ARQ stands for automatic repeat request. The receiver checks the data and, if something is wrong, tells the sender to try again.

  1. NCVEC 2024-2028 Amateur Extra Question Pool, E8C08 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    D. If errors are detected, a retransmission is requested
    Checked 2026-10-11.
  2. NCVEC 2024-2028 Amateur Extra Question Pool, E8C11 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    A. They are the same
    Checked 2026-10-11.

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