If you can find a Jupiter GPS then G4JNT's 10MHz GPSDO is very simple:
http://www.g4jnt.com/SimpleGPSDO.pdf
There's a single sided PCB for it and the associated display on my web
site at: http://www.g4dcv.co.uk/GPSDO/GPSDO.htm
73 Paul G4DCV
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