[time-nuts] PTTI 2012, part 2

Bill Dailey docdailey at gmail.com
Tue Dec 4 14:46:34 UTC 2012


Agreed and they probably wouldn't use a cryogenic sapphire oscillator.

Sent from mobile

On Dec 4, 2012, at 8:34 AM, "Bob Camp" <lists at rtty.us> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at 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=92Hgjo8A at 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
> phk at 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.
> 
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