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 <csteinm...@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 > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
