10M Beacon

About the Beacon

  • Call-sign: W0ILO
  • Operating frequency: 28286.5 KHz
  • Location: Sabin, Minnesota, approximately 8 miles SE of Fargo, North Dakota
  • Transmitter: Kenwood TS-570
  • Controller: Arduino (software by AI0Q)
  • Antenna: Antron 99, vertically polarized, estimated height ~ 125’ (antenna teardown)

Beacon Message

The beacon sends a 3 block morse code message:


(location) (output power/antenna) (grid square)

The message is repeated at alternating speeds: first at 15 words per minute and then at 20 words per minute. Some automated monitoring stations report message speeds of 13 and 17 words per minute. This discrepancy may be due to Arduino processing overhead.

The beacon message was designed to be resistant to changing band conditions and to be easy to receive by using:

  • Short message length
  • Call-sign repetition

Transmitting the beacon message at two speeds is intended to help listeners. The faster speed may allow complete message reception when propagation conditions do not allow for sufficiently long lived transmission paths. And the slower speed may help listeners who need slower morse code speeds to decode the beacon message when propagation is good and steady.

Reception Reports

Reception reports concerning the 10M Beacon are appreciated. Please use one of the following methods: