[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.
> > >
> > >   _______________________________________________
> > > 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.
> > >
> >  >
> > >
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>
>
>
> --
> Doc
>
> Bill  Dailey
> KXØO
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