This project started off by that I was in need of a relative accurate and stabile source of oscillation. After doing some research on the net it turns out that a lot of work has been done by hams around the world to make a reference oscillator. But there was one project that I found particularly very interesting because of its simplicity and availability of parts. (The gps unit, the jupiter T series has been discontinued by the manufacturer since 2005 but regularly shows up on e-bay) Particularly I valued that there exists readymade PCBs. I dont like making dual sided small components PCBs on home brew basis, because the precision and quality of these home brew cards just arent good enough to satisfy me. To cut this story short: I am only going to show some pictures of this project on this site, and I ask that anyone interested to dive deeper into the technical aspect of this solution visit the author of this simple but very effective GPS disciplined oscillator. Please visit G3RUH, James Miller here http://www.jrmiller.demon.co.uk/
GPSDO main parts
Here are the oscillator main parts.
Top: Jupiter GPS card.
Left: OCXO with G3RUH controller amplifier.
Rigth: GPS & PLL controller.
Workshop
What a mess 
HI
Enclosure
Trying placement in enclosure.
Few minutes after first startup.
My racal-dana 1992 counter dont need a reference oscillator showing 10.0000000 MHz on it’s own. Oscilloscope showing the image of output signal and multimeter showing the EFC control voltage.
GPSDO
Closeups
GPSDO test setup
GPSDO and test instruments.
Oscilloscope image
GPSDO output image
Unit in enclosure
GPSDO unit in its enclosure with cover off
Completed GSPDO unit
GPSDO ready for use.
GPS NMEA-0183 output
Computer terminal showing the ASCII plaintext NMEA-0183 protocol output from the unit.
I have also build a second unit. GPSDO MKII
First edition: 26.10.2008
Lastest edit: 12.01.2012
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