This is a very interesting thread. When I retired from Western Kentucky University in 2001 I was given a very expensive mantel clock. Seven day wind up with a balance wheel. I have had a lot of fun regulating it over the last 7 years. Right now I have it holding within 5 seconds a month but past experience has shown that it won't hold indefinitely. Since the balance wheel is also an oscillator I assume it will undergo these frequency jumps.
Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: "Bob Q" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Wednesday, October 22, 2008 8:22 PM Subject: Re: [time-nuts] Question on crystal jumps > Do rubidium standards use an OCXO? > Bob Q. > > ----- Original Message ----- > From: "Rick Karlquist" <[EMAIL PROTECTED]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Wednesday, October 22, 2008 2:23 PM > Subject: Re: [time-nuts] Question on crystal jumps > > >> I'm not quite sure what the question is here, but when >> we made 10811 oscillators at HP, "jumps happened". Some >> crystals were better than others, but no crystal was immune >> from jumps. With good quality crystals, you might be able >> to put an upper bound on the magnitude of jumps, like 10-9, >> but not on the time between jumps. I also noticed that there >> didn't seem to be any correlation between jump activity >> and stability between jumps. You could have an oscillator >> with really low aging, say a few parts in 1E11 per day that >> looked really good for quite a while, but then the frequency >> jumps. After you've controlled everything you can about the >> crystal process, the electronics, the oven and the environment, >> you are still left with jumps. If you want no jumps, go to >> an atomic standard like rubidium. There are mechanisms that >> can cause jumps in rubidium standards as well, but good >> rubidium standards don't jump. >> >> Rick Karlquist N6RK >> >> >> [EMAIL PROTECTED] wrote: >>> I would be very pleased to know when (date and time) anybody >>> out there happened to record jumps in frequency of crystals. >>> I have stable (e-07) tuning forks which happen to jump too, >>> and I don't understand why, even having under control >>> temperature and air pressure. Sometimes they return to their >>> prior frequency with another jump, and this could happen even >>> days later, sometimes they jump and then recover smoothly the >>> prior frequency in a short time (such as one hour). >>> I have no idea whether any correlations would exist between >>> crystals and tuning forks jumps, regarding the causes that >>> could trigger metastability, and hence I would have a look at >>> crystal data in order to improve the base for future >>> speculation. >>> >>> Thanks in advance. >>> Antonio I8IOV >>> >>> >>> >>> _______________________________________________ >>> 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. > > > _______________________________________________ > 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.
