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SESK: Stuff Everyone Should Know · sesk.info/hame-630m-eirp

Outside parts of Alaska, what is the maximum radiated power allowed on the 630 m amateur band?

5 W EIRP, even though the transmitter may run up to 500 W PEP.

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  1. 5 W EIRP ✔
  2. 1 W EIRP
  3. 500 W EIRP

Why: Rule 97.313(l) caps 630 m at 500 W PEP from the transmitter and 5 W EIRP radiated. Stations in Alaska within 800 km of Russia are held to 1 W EIRP.

Huh, didn't know that: The neighboring 2200 m band (135.7 to 137.8 kHz) is tighter still, with a 1 W EIRP limit.

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References

Answer: 5 W EIRP. Rule 97.313(l) caps 630 m at 500 W PEP from the transmitter and 5 W EIRP radiated. Stations in Alaska within 800 km of Russia are held to 1 W EIRP.

  1. 47 CFR 97.313 Transmitter power standards (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.313
    radiated power exceeding 5 W EIRP, except that in Alaska
    Checked 2026-10-11.
  2. 47 CFR 97.313 Transmitter power standards (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/47/97.313
    radiated power exceeding 1 W EIRP
    Checked 2026-10-11.

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