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

Mark Spencer mspencer12345 at yahoo.ca
Thu Dec 8 09:34:56 EST 2011


Thanks, the price is very high for me as well.   The starting price is almost an order of magnitude more than I paid for my FTS 1050.   I won't be bidding.

--- On Thu, 12/8/11, Azelio Boriani <azelio.boriani at screen.it> wrote:

> From: Azelio Boriani <azelio.boriani at screen.it>
> Subject: Re: [time-nuts] High end OCXO alternatives (or maybe an high perf Rb ?)
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Received: Thursday, December 8, 2011, 9:17 AM
> 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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