UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Success Stories


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!

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

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.

Keith956 is online now   Reply With Quote
Old 22nd Oct 2021, 11:18 am   #22
mole42uk's Avatar
Join Date: Aug 2010
Location: Bristol, UK
Posts: 2,295
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.

recursive loop: see recursive loop
mole42uk is offline   Reply With Quote

Thread Tools

All times are GMT. The time now is 7:31 am.

All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at
Failure to heed this warning may result in death or serious injury to yourself and/or others.

Powered by vBulletin®
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.