FCC regulations part 15.225 allow operation in the 13.553-13.567 MHz range with a field strength of 10,000 μV/m measured at a distance of 30 meters. This works out to a little under 2 mW into a 1/2 wave dipole antenna.
In addition to legal beacon stations, there are also many hobbyist run beacons which are not legal under government regulations. These are commonly referred to as High Frequency Beacons or Pirate Beacons.
15.225 Operation within the band 13.553-13.567 MHz
(a) The field strength of any emissions within this band shall not exceed 10,000 microvolts/meter at 30 meters.
(b) The field strength of any emissions appearing outside of this band shall not exceed the general radiated emission limits shown in 15.209.
(c) The frequency tolerance of the carrier signal shall be maintained within +/- 0.01% of the operating frequency over a temperature variation of -20 degrees to +50 degrees C at normal supply voltage, and for a variation in the primary supply voltage from 85% to 115% of the rated supply voltage at a temperature of 20 degrees C. For battery operated equipment, the equipment tests shall be performed using a new battery.
- MedFER/HiFER list from the Longwave Club of America (LWCA)
- "NC" Hi-Frequency Beacon by Joe Dexter McIntyre, W4DEX