GB3LEX is a 3cm Microwave Beacon.

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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.


0 #3 admin 08th Jun 2018 11:27
The beacon has now been returned to service as of 07 June 2018.
0 #2 admin 03rd Nov 2016 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.
0 #1 admin 29th Oct 2016 21:05
We have received a report that the beacon is currently off-air and we are investigating.