Tom Really? What mechanism do you have in mind?
In practice the same effect is observed when the Earths magnetic field is cancelled using a set (3 pairs) of Helmholtz coils (or equivalent) or in a magnetically sheilded enclosure? Bruce Tom Duckworth wrote: > The orientation change is due more to the earth's magnetic flux effect > on the oscillator, and less so from gravity. > > Tom > Tom Duckworth > tomd...@comcast.net > ----- Original Message ----- From: "John Green" <wpxs...@gmail.com> > To: <time-nuts@febo.com> > Sent: Thursday, August 13, 2009 11:02 AM > Subject: [time-nuts] OCXO sensitive to gravity > > >> A while back there was some discussion about crystal oscillator's >> changing >> frequency due to the effects of gravity. Since I got my Z3801 up and >> running >> full time, I have been trying to characterize some OCXOs I had picked >> off >> eBay but had no specifications for. I was trying to fine tune one to the >> '3801 and noticed that when I picked it up and tilted it to get to the >> adjustment , the frequency changed. I started rotating it 90 degrees >> at at >> time and noticed that the frequency changed up or down depending on >> which it >> was oriented. The change was immediate and quite noticeable. It is >> nice to >> have something as stable as the Z3801 but now I realize all those >> OCXOs I >> thought were so great, aren't. I do see why the rubidium sources are >> well >> liked. They lock in a couple of minutes and that's pretty much it. >> The ones >> I bought off eBay were both off by about 1E-9. It occurred to me that >> they >> probably in equipment where they were locked to GPS and with nothing >> connected to the frequency control input, they would naturally be a >> little >> off. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
