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Old 6th Oct 2022, 3:15 pm   #1
Keith956's Avatar
Join Date: Jun 2019
Location: Oxfordshire
Posts: 552
Default Yet another GPSDO

Inspired by Mole42UK's excellent work on a GPSDO ( and the work of James Miller G3RUH (, the GPSDO I have been prototyping for a year now has finally moved on from a breadboard to a PCB.

I added/modified a few things :
- a bufffered, switchable output squarewave of 1KHz, 10KHz, 100KHz, 1MHz and 10MHz since all of those were available from the '390 dividers driven by the 10MHz Isotemp OCXO.
- a 10MHz filtered/buffered sinewave output that can drive 50ohms.
- a PIC that displays the time in UTC, the lock status, number of satellites locked on and the switched output frequency.
- RS232 output for debugging the Jupiter output messages (that were decoded by the PIC)
- onboard +12V and +5V power suply using DC-DC converters (linear ones ran too hot with the ~0.75A drawn by the xtal oven when warming up).

Needless to say a few mistakes were made including initially incorrectly wiring the 12V and 5V supplies which resulted in blowing a Jupiter module (fortunately I had a spare). Rev 2 of the PCB still is not perfect, but it works.
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