[time-nuts] HP 10811 stabilizing time

[djl]

Just visited site. 3million hits on
10811 manuals. We're that many made:-)?

On 2019-07-23 05:01, Charles Steinmetz wrote:
> 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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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
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