I have a 5352B 40 GHz frequency counter which was fitted with a TCXO. I removed that and fitted an HP 10811-60111 S/N 2332A17049 which I removed from a 5370B time interval counter - I have a few of those, and the microwave frequency counter needed the oven more than the time-interval counter.
Looking at the specification of the 5352B, there were 3 oscillator options * Standard TCXO * Option 001 Oven time based. Long-term aging < 5 x 10^-10 / day after 24 hour warmup. < 1 x 10^-7 / year for continuous operation. * Option 010 High stability time base. Long term aging < 1 x 10^-10 / day. < 3.6 x 10^-8 / year for continuous operation. To be honest, when the instrument is here, I will use a GPS reference. But I might want to take it to the amateur radio club sometimes. I would like to get the best oscillator I can. Are any models going to be better than others, or by this time, is it just pot luck? I think it's the latter, but maybe some are double-ovens and some single. With the exception of power cuts of up to a few hours, the HP 10811-60111 I fitted has been continuously powered on for a few years. But due to soaring power costs, I am going to switch my ovens off. Dr David Kirkby Ph.D Email: drkir...@kirkbymicrowave.co.uk Web: https://www.kirkbymicrowave.co.uk/ Kirkby Microwave Ltd (Tel 01621-680100 / +44 1621-680100) Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com