Hi
> On Apr 9, 2017, at 10:01 PM, Alex Pummer <[email protected]> wrote: > > actually it does not compensate for temperature it is just for reduce the > production cost for the crystal. We --Jean Hoerni [founder of intersil, > Eurosil and one of the traitors who started Fairchild Semiconductor] and me > -- made something very similar at the time of begin of the quartz clock era > for Lipp a French watch maker in Bezancon [a city an France the spelling is > most likely not correct]. The company exhibited it at the Basler exhibition > of Horology, the clock was simple good working and not to expensive, Ebachos > --OMEGA -- people visited the booth, they also had their quartz clock which > was much more expensive -- they looked, the Lipp clock and told na there are > Rolls-Royce s and deux chevaux [that was a simple little ugly but very > reliably French car ] as response Mr. Hoerni told them yes, and there are > technologies not known in your house, the Omega people recognized him and > walked away quietly... > > 73 > > Alex Just to put this in context. The “prior state of the art” was to have a trimmer capacitor in the watch (or clock) module to set it on frequency. That’s why it was obvious from a quick look that something was different. There were semiconductor companies making watch modules at the same time still using trimmer capacitors. The pulse drop / add was not at all an “obvious” solution at the time. Bob > > > On 4/9/2017 1:11 PM, Bill Hawkins wrote: >> Nice article in Wikipedia. Didn't see any familiar names in the >> reference list, though. >> >> Seems to me inhibition compensation is useful for compensating for the >> variation in purchased crystal frequencies, but not for temperature >> compensation. >> >> Also seems to me that a watch spends 2/3 of a day at wrist temperature >> and 1/3 at bedroom temperature, which varies with the seasons. >> >> Would a ceramic capacitor crafted for a certain temperature coefficient >> work? Can the fork have a crafted tempco? >> >> Bill Hawkins >> >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of Ron >> Bean >> Sent: Sunday, April 09, 2017 12:05 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork >> crystal specs >> >>> In your case, the car sits in an environment that matches their test >>> setup well. In my case ?\200? not so much. >> FWIW, mine drifts pretty badly. It's in an aftermarket stereo, and I >> don't remember when I bought it (I moved it from my previous car). >> >> I assume that all quartz clocks and watches these days use "inhibition >> conpensation". >> >> https://en.wikipedia.org/wiki/Quartz_clock#Inhibition_compensation >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2016.0.8012 / Virus Database: 4769/14275 - Release Date: 04/09/17 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
