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SESK: Stuff Everyone Should Know · sesk.info/hame-line-a

Amateurs may not transmit north of Line A in which UHF segment?

420 to 430 MHz, in the 70 cm band.

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  1. 420 to 430 MHz ✔
  2. 430 to 440 MHz
  3. 440 to 450 MHz

Why: Rule 97.303(m)(1) says no amateur station shall transmit from north of Line A in the 420-430 MHz segment. Line A is defined in 97.3(a).

Huh, didn't know that: In 420 to 430 MHz, amateurs must also accept interference from FCC land mobile stations within 80.5 km of Buffalo, Cleveland and Detroit.

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References

Answer: 420 to 430 MHz. Rule 97.303(m)(1) says no amateur station shall transmit from north of Line A in the 420-430 MHz segment. Line A is defined in 97.3(a).

  1. 47 CFR 97.303 Frequency sharing requirements (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.303
    No amateur station shall transmit from north of Line A
    Checked 2026-10-11.
  2. 47 CFR 97.303 Frequency sharing requirements (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.303
    See § 97.3(a) for the definition of Line A
    Checked 2026-10-11.
  3. 47 CFR 97.303 Frequency sharing requirements (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.303
    within 80.5 km of Buffalo, Cleveland, and Detroit
    Checked 2026-10-11.

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