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

John Ackermann N8UR jra at febo.com
Thu Dec 8 08:34:11 EST 2011


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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