Power & Antenna Info
The following is National Radio Clubs' standardized list of antenna designations:

  • D1 Day time operation only, nondirectional antenna.
  • D3 Day time operation only, directional antenna, same pattern at all times.
  • D4 Day time operation only, directional during critical hours only.
  • D5 Day time operation only, directional during non-critical hours, non-directional
    during critical hours.
  • D6 Day time operation only, different patters during critical hours and non-critical hours.
  • L1 Limited time operation, non-directional.
  • L3 Limited time operation, directional pattern.
  • N1 Night time operation, non-directional.
  • N3 Night time operation, directional.
  • SH Specified hours. Numbers showing pattern correspond to numbers under "U" category.
  • ST Shared Time; broadcasting time shared with another station(s) on the same channel.
  • U1 Unlimited operation, non-directional antenna.
  • U2 Unlimited operation, directional at night only.
  • U3 Unlimited operation, directional all hours, same pattern day and night.
  • U4 Unlimited operation, directional, different patterns day and night.
  • U5 Unlimited operation, directional day, non-directional night.
  • U6 Unlimited operation, directional night and critical hours, same pattern.
  • U7 Unlimited operation, directional all hours, but three different patterns (day, night, critical)
  • U8 Unlimited operation, different directional patterns critical hours and night, non-directional day.
  • U9 Unlimited operation, different directional patterns non-critical day hours and nights, non-directional critical hours.
  • U10 Unlimited operation, non-directional day, directional critcal hours, non-directional nights.

    psra - Pre Sunrise Authority. The power the station is allowed to use from 0600 local to local sunrise utilizing the daytime pattern.
    Day Time - Local sunrise to local sunset.
    Critical Hours - Sunrise to two hours after sunrise and two hours before sunset to sunset.
    Limited time operation - Usually based upon sunrise or sunset at the dominant station's location.
    Night time operation - local sunset to sunrise.

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