[time-nuts] High end OCXO alternatives (or maybe an high perf Rb ?)

Azelio Boriani azelio.boriani at screen.it
Thu Dec 8 09:17:16 EST 2011


The price is very high (for me) but on the usual auction site again you can
find an FTS1050 too: 150714877944

On Thu, Dec 8, 2011 at 2:34 PM, John Ackermann N8UR <jra at febo.com> wrote:

> Hi Mark --
>
> This may be challenging.  A good FTS-1050 can be very, very good indeed.
>  I have one that seems to have a wideband noise floor problem (about 20dB
> worse than it should be) but has stability below 3e12 out to 200K seconds
> -- it's just quite amazing.
>
> Plots attached, with an HP 5065A Rb as the reference.  The short term
> stability (below about 100 seconds) is limited by the reference, and that's
> the hard part; a maser is about the only thing that can give you low short
> term and low term stability.
>
> Lacking a maser, the best strategy may be to use two references for
> different tau ranges -- a very good OCXO for short term, and then an Rb for
> long term.  Combine the plots and you'll probably see the point where the
> lines intersect.
>
> John
> ----
>
> On 12/7/2011 9:41 PM, Mark Spencer wrote:
>
>> Greetings:
>>
>> I'm contemplating starting a search on the "typical auction sites" for a
>> high end OCXO (or possibly a high end Rb) that would be suitable for
>> characterizing the performance of an FTS 1050.   From time to time I've
>> seen ADEV figures of in the 10E-13 range (at a typical Tau of 100 seconds)
>> when comparing the FTS 1050 in question to one of my GPSDO's and one of my
>> Rb's.
>>
>> At this point I'm contemplating looking for:
>>
>> Another FTS 1050
>> Various Datum / FTS stand alone OCXO's
>> An Oscilloquartz BVA OCXO
>> A Sulzer OCXO
>> Maybe an HP 5065
>>
>> (I've already assembled a modest collection of half a dozen various
>> 10811's and don't really want to buy any more at this point.)
>>
>> Essentially I'm looking for something with a reasonable likely hood of
>> consistently having an ADEV in the 13's at Taus of 100 seconds or so.
>> I'm thinking that another FTS 1050 is probably the most likely
>> alternative but I'm trying to keep an open mind to other options.  I'm not
>> really interested in a Cesium standard but if anyone has any other
>> suggestions of products I could look for (other than a H maser (:  )
>>  comments on or off list would be appreciated.
>>
>>
>> Regards Mark Spencer
>>
>>
>>
>>
>>
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>
>
>
>
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