As a service to amateurs far and wide ERG maintains and operates GB3CMS, a beacon on the 10GHz microwave band. Please make beacon keeping a more rewarding activity than normal by giving us feedback such as signal reports from afar. In contrast to the voice repeaters, CMS is based on a domestic site. The keeper is Clive Ward, G1EUC who would welcome reports.
- 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 will be replacing the former DDK/WDG001 stages
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Frequency | 10.368960 GHz, Emission F1A |
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Keyer Output | GB3CMS JO01HR S--(mark)--S |
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Equipment | G4DDK004/G3WDG001 Masthead Tx, G4FUF Keyer/PSU |
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Power | Tx -13dBW, PEP-3dBW (prior to upgrade) |
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Antenna | Horizontally Polarised Omnidirectional Slotted Waveguide (10-slot winged K5SXK/WA5VJB based design) |
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Location | Square JO01HR01 - Danbury, Essex - NGR TL 786 052 |
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Antenna Height | 120m above sea level, 10m above ground level |
Gallery Pictures:-
Pictures of the GB3CMS Keyer Unit and Masthead RF Unit/Antenna can be found in the ERG Gallery
Slotted Waveguide Antenna
Files:-
Antenna Design Paper,
Outline Drawing,
GB3CMS Antenna Patterns,
Water Drain
Pictures:-
Slotted Antenna,
Construction,
Radome
More About Microwaves...
If you are interested in microwave operation and want to know more, visit the UK Microwave Group.
Its also worth
having a look at the websites of Sam Jewell G4DDK and Peter Day G3PHO.
18-Nov-2007