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

paul swed paulswedb at gmail.com
Thu Dec 8 10:02:47 EST 2011


What can you say about the used car sales site. Rarely bargains anymore.
Prices are genrally nut for a time-nut and unfortunately its driven the
used equipment pricing through the roof.
Yes I purchased my HP 105s for sub $100
Regards
Paul

On Thu, Dec 8, 2011 at 9:34 AM, Mark Spencer <mspencer12345 at yahoo.ca> wrote:

> 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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