GB3CMS 10GHz Microwave Beacon
As a service to amateurs far and wide ERG maintains and operates GB3CMS, a beacon on the 10GHz microwave band.
Originally based in Danbury, work is in progress to move it to the Chelmsford area.
Please make beacon keeping a more rewarding activity than normal by giving us feedback such as signal reports from afar.
Status: Off Air - pending site install/upgrades
|G4DDK004/G3WDG001 Masthead Tx, G4FUF Keyer/PSU
| Tx -13dBW, PEP-3dBW (prior to upgrade)
|Horizontally Polarised Omnidirectional Slotted Waveguide
(10-slot winged K5SXK/WA5VJB based design)
|JO01GQ09 - Chelmsford, Essex - NGR TL 730 039
Pictures of the GB3CMS Keyer Unit and
Masthead RF Unit/Antenna can be found
in the ERG Gallery
Slotted Waveguide Antenna:- Pictures:
Antenna Design Paper,
GB3CMS Antenna Patterns,
More About Microwaves...
If you are interested in microwave operation and want to know more,
visit the UK Microwave Group.
Some earlier history...
GB3CMS was the third system ERG put on air in Feb 1990 after DA/ER following an
application made in Oct-1988. Original construction was largely by Keith G4FUF.
- An application to raise its output power by 10dB was made in RMC Submission Batch 117 in July 1999.
- A replacement application was submitted in Sept-2006 to Ofcom and approved on 30-May-2007
- A new G8ACE Source/Multiplier has replaced the former DDK/WDG001 stages
- Now reconfigured for the 108.04MHz source to be in the indoor drive/PSU unit