[time-nuts] PTTI 2012, part 2
Mark Kahrs
mark.kahrs at gmail.com
Wed Dec 5 14:26:09 UTC 2012
I couldn't resist and did a little reading.
So, the MIT Flea has MOT cells? That would seem to be the deal breaker to
me. The rest is "just plumbing". And smoke and mirrors.
On Tue, Dec 4, 2012 at 8:23 PM, <EWKehren at aol.com> wrote:
>
>
>
> In a message dated 12/4/2012 6:10:36 P.M. Eastern Standard Time,
> docdailey at gmail.com writes:
>
> I will build one right away.. but I didnt see your request. My problem
> is
> surface mount components (the multipin or no leads)... I am not confident
> in that. but I would certainly try. I am not a programmer and also
> figure somebody with more soldering skills than those I have picked up
> ruining things would be desired. I am always willing to try not to ruin
> something.
>
> Doc
> KX0O
>
>
> On Tue, Dec 4, 2012 at 4:25 PM, <EWKehren at aol.com> wrote:
>
> > Paul
> > Frankly I do not think I will live long enough to see a time nut build
> a
> > fountain Rb. Over the four years I have watched many smoke and mirror
> > projects with nothing coming out of is. In German we have a saying:
> paper
> > is
> > patient. We should walk before we run.
> > Many members did buy a FE 5680, how many do you think are in operation,
> if,
> > there would be discussions about its temperature performance. take a
> close
> > look on page 7 figure 5 of the brochure, I also see it. Personally I
> use a
> > Shera loop. But that is an overkill and for some to complex since it
> > requires direct analog C field control. My real focus is on controlling
> > FRK-H,
> > M100 and HP 5065.
> > What is needed is a coordinated effort to start with temperature
> control, a
> > simple GPSDO only taking care of aging using RS232 interface an analog
> > loop for controlling something like a Morion. Stability and accuracy
> > could be
> > in the 1 E-12 range, low cost able to be assembled by 90% of list
> members,
> > but then I proposed it once before looking for some one to develop the
> > filter. No response, it is clear that very few are willing or able to
> > actually
> > build something.
> > When Corby wrote about his experience with the dual mixer / counter,
> large
> > response and we will have a complete documentation set, but when I
> asked
> > for a few that would be willing to build one right away, I would make
> > complete kits, I got one response. Sad, but that is the reality.
> > How many FE 5680A door stops do you think are out there? How many
> > PICTICII's do you think are in use?
> > Bert Kehren Miami.
> >
> >
> > In a message dated 12/4/2012 9:49:29 A.M. Eastern Standard Time,
> > paulswedb at gmail.com writes:
> >
> > 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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>
>
> --
> Doc
>
> Bill Dailey
> KXØO
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