[time-nuts] PTTI 2012, part 2

Bob Camp lists at rtty.us
Wed Dec 5 00:06:41 UTC 2012


Hi

My 8th grade science project was made from optical bits from the MIT flea. One of the criticism's of the project was that it could have been better if I'd just shopped a bit harder….

What ever it is you need - it'll be gone when you need it. 

Bob

On Dec 4, 2012, at 10:05 AM, Bill Dailey <docdailey at gmail.com> wrote:

> 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.
>>> 
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at 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 at 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 at 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 at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.




More information about the time-nuts mailing list