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SESK: Stuff Everyone Should Know · sesk.info/hame-auto-digital-500hz

Outside the listed segments, an automatically controlled data station answering interrogation may use at most what bandwidth?

500 Hz or less.

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  1. 2.8 kHz
  2. 500 Hz ✔
  3. 6 kHz

Why: Rule 97.221(c) allows automatic control outside the listed segments only when answering an interrogation from a station under local or remote control. Its transmissions must not occupy more than 500 Hz.

Huh, didn't know that: This rule does not apply to beacon, repeater, auxiliary, earth, space or space telecommand stations.

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References

Answer: 500 Hz. Rule 97.221(c) allows automatic control outside the listed segments only when answering an interrogation from a station under local or remote control. Its transmissions must not occupy more than 500 Hz.

  1. 47 CFR 97.221 Automatically controlled digital station (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.221
    occupies a bandwidth of more than 500 Hz
    Checked 2026-10-11.
  2. 47 CFR 97.221 Automatically controlled digital station (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.221
    on the 6 m or shorter wavelength bands
    Checked 2026-10-11.
  3. 47 CFR 97.221 Automatically controlled digital station (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.221
    This rule section does not apply to an auxiliary station
    Checked 2026-10-11.

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