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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 p...@freebsd.org | 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 -- 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.
