SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-leave-band-edge-margin

Why should you leave room inside an amateur band edge?

Leave margin for display error, sidebands, and frequency drift.

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  1. Only transmitter display error
  2. Display error, sidebands, and drift ✔
  3. Only modulation sidebands

Why: Your displayed carrier frequency is not the whole occupied signal. Calibration error, modulation sidebands, and transmitter drift can push energy outside the authorized band.

Huh, didn't know that: A station must keep its entire transmitted signal inside its authorized frequencies.

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Why did the signal avoid the edge? It did not want to fall out of band.
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References

Answer: Display error, sidebands, and drift. Your displayed carrier frequency is not the whole occupied signal. Calibration error, modulation sidebands, and transmitter drift can push energy outside the authorized band.

  1. 2026-2030 Technician Class Question Pool ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    To allow for calibration error in the transmitter frequency display
    Checked 2026-10-09.
  2. 2026-2030 Technician Class Question Pool ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    So that modulation sidebands do not extend beyond the band edge
    Checked 2026-10-09.
  3. 2026-2030 Technician Class Question Pool ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf
    To allow for transmitter frequency drift
    Checked 2026-10-09.

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Ham RadioWhich sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?Ham RadioWhich agency makes and enforces the rules for amateur radio in the United States?Ham RadioWhich of these is prohibited for amateur radio operators?

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