The FCC recently reminded holders of experimental high-frequency (HF) licenses that they must comply with the agency’s station identification rules, ending a period in which some experimental HF operations had been transmitting without identification under waivers. The ruling clarifies that experimental HF stations in the 2–25 MHz band must transmit their assigned callsign at least once every 30 minutes in plain voice or Morse code–with digital modulation disabled during the ID–to help manage interference with incumbent spectrum users, including amateur bands.

Note that Bennett Kobb first reported this on Experimental Radio News.

Read the Radio World article by clicking here.