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  • DA1: Station is directional at all times and uses the same pattern at all times.
  • DA2: Station is directional at all times and uses different patterns for daytime and night.
  • DA3: Station is directional at all times and uses different patterns for daytime, critical hours*, and night.
  • DAD: Station is directional in the daytime only.
  • DAN: Station is directional at night only.
  • ND1 or ND2: Station is non-directional.
  • NDD: Station is non-directional and operates during daytime only.
  • *"Critical hours" are from sunrise to 2 hours after sunrise and from 2 hours before sunset to sunset.