[time-nuts] HP 10811 stabilizing time
Club Internet
clemgill at club-internet.fr
Wed Jul 24 09:00:09 UTC 2019
Hi,
Thanks for the info.
I did’nt find how to find you paper in ko4bb.com
Thanks for pointing.
Best,
Gilles.
Envoyé de mon iPad
> Le 23 juil. 2019 à 13:01, Charles Steinmetz <csteinmetz at yandex.com> a écrit :
>
> Rick wrote:
>
>> Basically, no counter that we ever made AFAIK had
>> any provision for EFC.
>
> The later HP5328 "oscillator helper" boards have EFC pots for fine tuning the timebase frequency. This includes the US military versions that are so prevalent in the US. I have schematics showing this with both the 10544 (support board 05328-60027) and 10811 (support board 05328-60038) oscillators (production shifted from the 10544 to the 10811 during the 5328's run).
>
> These work fine, but one can easily build an EFC circuit with much better drift characteristics (i.e., first-order temperature compensation). I published such a circuit some time ago and posted it to this list at least once. My circuit also reduces the EFC adjustment range to make it easier to adjust precisely.
>
> That circuit is on Didier's site (ko4bb.com). Search for a doc named "HP 10544 10811 EFC fine adjustment.pdf".
>
> Best regards,
>
> Charles
>
>
>
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