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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 22nd Oct 2021, 9:03 am   #21
Keith956
Hexode
 
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Join Date: Jun 2019
Location: Oxfordshire
Posts: 383
Default Re: Finally a GPSDO that works

Richard,
I managed to get a Jupiter T board and Isotemp VCXO working with a similar arrangement to your circuit (dividing the Isotemp 10MHz output down to 10KHz and locking to the Jupiter).

It seems stable to 11 digits on my HP53132A that has its own OXCO after a hour or so's warmup. 10MHz +/- 5mHz or better, the variance may be the 53132A, but without another GPSDO to compare I've no way of knowing.

A question: why did you use a CD4046 PLL rather than the James Miller 7486 XOR as a phase comparator? I've tried both and can't see any obvious difference in performance.

Keith
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Old 22nd Oct 2021, 11:18 am   #22
mole42uk
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Join Date: Aug 2010
Location: Bristol, UK
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Default Re: Finally a GPSDO that works

Great news! I wished I could have got the Jupiter working, but it just wasn't to be.

I used the PLL chip because it seemed to be better at 100kHz which is the frequency that I chose to use for comparison.
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