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SESK: Stuff Everyone Should Know · sesk.info/ham-packet-radio-features

Which set of features is included in packet radio transmissions?

Packet radio includes a checksum, destination header, and repeat requests.

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  1. Voice tones, analog video, and a carrier
  2. Only a call sign and voice message
  3. Checksum, destination header, and repeat request ✔

Why: The checksum helps detect errors, the header identifies the destination, and an automatic repeat request asks for damaged information again. These features improve delivery.

Huh, didn't know that: Detecting an error and correcting it are separate steps.

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The packet asked for a repeat because it missed the first byte.
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References

Answer: Checksum, destination header, and repeat request. The checksum helps detect errors, the header identifies the destination, and an automatic repeat request asks for damaged information again. These features improve delivery.

  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. A checksum that permits error detection
    Checked 2026-10-09.
  2. 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
    B. A header that contains the call sign of the station to which the information is being sent
    Checked 2026-10-09.
  3. 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
    C. Automatic repeat request in case of error
    Checked 2026-10-09.

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