GB3FNY & GB3KEU Beacons

Finningley ARS Beacons

  • GB3FNY – 432.445MHz – Big Wheel – ERP 40W
  • GB3KEU – 5760.925MHz – Slot – ERP 25W
  • GB3FNY – 10368.752MHz – Slot – ERP 10W

Propagation Beacons are a vital resource to us, we use them to study the propagation of radio signals, from HF through to microwaves. Beacons are also used as signal sources to test and calibrate antennas, and receivers. Beacons are often run by groups/clubs, or by individual Amateurs.

The 5.7 Ghz beacon carries the callsign GB3KEU, in memory of Tim G3KEU, a keen microwaver who passed away in 2002.
GB3KEU was re-located to FARS, and on the air again in August 2017, follow this link for the History behind GB3KEU.

If you hear any of the beacons, we like to know so please spot it over the DX cluster network.

For a list of beacons on VHF> take a look at the beaconspot.uk website.


Denis G3UVR – the GB3FNY 10GHz beacon, via rain scatter.
IO83kh -Tropo- IO93nn – 152KM

Neil G4DBN’s twitter post about Wind Turbine Scatter/Doppler on GB3FNY 10GHz – http://www.g4dbn.uk/?p=834


GB3FNY 70cms – 432.445

A few technical notes from the beacon builder, Bernie G4HJW.
A 14.410 MHz crystal is multiplied by 30 to 432.445MHz at 20dBm. This is amplified to 33dBm (mis) using a BGD814 CATV module, and feeds the antenna via an isolator, and low pass filter assembly.

The antenna is a Clover Leaf/Big Wheel, with 3dBd of gain, not very high up, only 8M over ground, and 1M ASL. It ran QRP with just 2W until September 2017, when the beacon received a 25W PA.