[time-nuts] PTTI 2012, part 2

Bill Dailey docdailey at gmail.com
Tue Dec 4 15:05:30 UTC 2012


No MIT here.  Sadly.

Sent from mobile

On Dec 4, 2012, at 8:49 AM, paul swed <paulswedb at gmail.com> wrote:

> Basements the key. So for me bigger is better. Heck if its a rack thats ok.
> It gets interesting in what types of components you can use if you are
> willing to go larger.
> Great point on the laser and optics. Funny thing is for small change you
> can actually get used optics bench components at least at the last MIT flea
> I ran across the items. They were snapped up by the way.
> From what I have seen of time-nuttery and Hydrogen masers I am actually not
> all that sure its beyond this group.
> Regards
> Paul
> 
> On Tue, Dec 4, 2012 at 9:34 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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>> 
>> 
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