GB3LEX is a 3cm Microwave Beacon.

If you would like to help with the cost of running our Beacons, please click the donate button. 


Tx Freq
1w (erp)
Slotted Wave guide
Geoff G3TQF
On Air


The transmitter comprises a 108.010MHz ovened xtal oscillator F2 modulated. The frequency is locked using the reverse DDS technique to a GPS referenced 10MHz source. 

The output of the 108.010MHz source is fed to a mast mounted box containing a frequency multiplier and amplifier producing a filtered output at 10368.955MHz of 1.0Watts.

The antenna is a waveguide slotted on both sides thus producing an approximately omni radiation pattern with a peak erp of 10dBW.


+1 #5 admin 2019-03-31 10:07
After extensive testing, GB3LEX was returned to service on 31st March 2019.
#4 admin 2018-11-29 22:24
After receiving a report of interference from a local user, the beacon was taken off-air for investigation at 14:50UTC on 29th November 2018
#3 admin 2018-06-08 11:27
The beacon has now been returned to service as of 07 June 2018.
#2 admin 2016-11-03 07:40
Further to our investigations, the beacon appeared to be operating at much reduced power so it has been removed from the mast for further investigation.
#1 admin 2016-10-29 21:05
We have received a report that the beacon is currently off-air and we are investigating.