[time-nuts] HP 10811 stabilizing time

[Club Internet]

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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