[time-nuts] Thinking outside the box a super reference

Bob Camp kb8tq at n1k.org
Thu Nov 3 20:02:31 EDT 2016


Hi

Do you believe that they could produced in volume for < $1,000 each without 
any significant setup investment?

Bob


> On Nov 3, 2016, at 7:52 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> Attached graph indicates ADEV achieved with a 25mm double resonance Rb vapour cell 
> Performance appears somewhat better than HP5065A (even Corby's souped up version).
> The thesis (by  Thejesh N. Bandi) on this double resonance Rubidium vapour cell in a Magnetron style cavity was completed at the University of Neuchatel.
> Bruce 
> 
>    On Friday, 4 November 2016 11:58 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> 
> There is at least one recent thesis where a dual resonance rubidium vapor cell was built and used to lock a low noise OCXO,The machining of the cavity didnt appear particularly challenging nor did the locking of the laser to the relevant wavelength using an auxiliary rubidium vapour cell.IIRC thee performance was better than the telecom market rubidium standards.
> Bruce 
> 
>     On Friday, 4 November 2016 11:34 AM, Attila Kinali <attila at kinali.ch> wrote:
> 
> 
> On Thu, 3 Nov 2016 16:54:24 -0400
> Bob Camp <kb8tq at n1k.org> wrote:
> 
>> If you look at a modern CPU as “just a handful of sand and some stuff”, it seems
>> pretty easy to build one in the kitchen after an hour or two of setup. When you dig
>> into the nasty details the line costs rapidly spiral off into the stratosphere. Atomic 
>> standards are not quite as complex, but there still is more than just a little custom 
>> equipment involved. $1M sounds a bit on the low side of what it might take. 
> 
> 
> Not necessarily. There is a large corpus of knowledge available on
> how to build vapor cells standards and what is a good idea and what
> isn't. Most of it is documented in papers of the PTTI, EFTF and IFCS.
> The former two are freely available (for PTTI until 2010, but that
> should be good enough). Getting access to those papers behind a
> paywall, you only need to know someone with access to a university.
> (not for PTTI post 2010 though, ION has quite anal access rules)
> 
> Additionally, the people in the time and frequeny community are very
> open to discussion and exchange of knowledge. You can almost always
> just walk up to someone and ask questions with a high chance of getting
> not only answers but help in how to proceede. 
> 
> Tapping into this knowhow would avoid the need to try out the whole
> solution space and concentrate on the few parts that are unkown or
> not well enough understood and optimize those. And by doing so safe
> a lot of money.
> 
>             Attila Kinali
> 
> -- 
> Malek's Law:
>         Any simple idea will be worded in the most complicated way.
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