[time-nuts] PTTI 2012, part 2

EWKehren at aol.com EWKehren at aol.com
Wed Dec 5 01:23:54 UTC 2012



 
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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