Microwave Amateur Radio Station, Waterbeach. 8km North Of Cambridge JO02cg
To Contact me:
E-mail john at g4bao dot com
GB3CAM 24GHz beacon
Allocated Frequency - 24048.870MHz GPSDO locked
Keying sequence is:
Odd numbered minutes. Unmodulated carrier until (minute +32 sec) then "GB3CAM" in Morse.
Location - West Cambridgeshire, IO92wi, 33m ASL
Antenna - Horizontally polarised slotted waveguide at 31m AGL clover leaf pattern
QTF approx 10dBi to SE/NW, 6 dBi SW/NW.
The idea for adding a 24GHz beacon to GB3CAM came out of some musings on the success of the 10GHz beacon. Mainly while cycling to work, in August 2007 and in a subsequent series of emails betwen myself, Bernie G4HJW and Sam G4DDK.
The idea came together very quickly as I already had a 12GHz multiplier, and Chris GW4DGU was keen to try out his design for a new ultra- stable oscillator known as the "DISTAW". (pron. dish-tau) . Apparently distaw is a Welsh adjective meaning quiet or silent.
So from concept to on air took just 13 months. It would have been 10 months if I'd not blown up two PAs in the process, but that's another story!
The upgrade in May 2010 with GPS locking made it the first 24GHz beacon in the world to run JT4G (unless you know better)
John, G4BAO - 24GHz beacon design build and test.
Chris, GW4DGU - 24GHz beacon reference oscillator.
Paul, G4AJE - Beacon site
James G3RUH - GPSDO
John G8ACE, Brian G4NNS, Andy G4JNT, - the Reverse DDS team
Ian, G8KQW, Brian G4NNS - 24GHz antenna build and test
Phil, G8MLA - 24GHz PA
Murray, G6JYB - Ofcom Liaison.
Tom, G4TWJ - original 24GHz PA
Sam, G4DDK - second 24GHz PA and moral support when things began to fail!
Alan G3NYP -Connectors
Dave WW2R/G4FRE - original keyer
Ian G4AKD - Trial site for 3cm beacon
The UK Microwave Group for financial support.
The shutdown operators. G4HJW, G4BAO, G4BEL, M0BXT
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