Agreed and they probably wouldn't use a cryogenic sapphire oscillator. Sent from mobile
On Dec 4, 2012, at 8:34 AM, "Bob Camp" <[email protected]> wrote: > Hi > > Indeed, you likely won't get USNO grade with a shoe box sized part. You can > get one to work and do quite good ADEV. No, I haven't done it, I'm just > going on what I've been told. The main point being that for a basement > project - smaller is probably lower cost. > > Bob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Poul-Henning Kamp > Sent: Tuesday, December 04, 2012 9:19 AM > To: Discussion of precise time and frequency measurement; Bill Dailey > Subject: Re: [time-nuts] PTTI 2012, part 2 > > -------- > In message > <CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com> > , Bill Dailey writes: > >> If you look at the papers on portable rubidium fountains >> they are significantly bigger than a shoebox (65 cm). > > Diameter is controlled by dispersion of the launched atoms (=recovery rate) > and the layers of shielding. > > 65cm looked like close to a minimum for USNO grade, amateurs could probably > make do with less shielding. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > 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.
