[time-nuts] High end OCXO alternatives (or maybe an high perf Rb ?)
EWKehren at aol.com
EWKehren at aol.com
Thu Dec 8 15:56:56 UTC 2011
Mark
As to measurements below 100 sec. the Dual Mixer I have been working on is
out there beeing tested by six people with good results, what is missing is
the link between the counter and Ulrich's plotter. Some smarter than I
have made patches using other plotting software. Corby has been using his
SR620, not using the 5 channel counter. The advantage of my counter is that you
do not have to tie up an expensive counter. As I speak two efforts are
ongoing one with a hardware solution that will include a LCD display and also
a USB memory stick allowing test runs without the use of a PC. Data will
be plotted afterwards on the PC using Ulrich's plotter. This will increase
the cost from $ 200 to S 250. The second effort is strictly software on the
PC keeping the cost below $ 200. Depending on the offset frequency you can
start your test at 0.1 Hz. I am working on a low cost offset source using
a very low noise, low cost 100 MHz VCXO locked to the reference channel.
Bert
In a message dated 12/8/2011 10:28:22 A.M. Eastern Standard Time,
mspencer12345 at yahoo.ca writes:
Bert, that is a good question and thanks for your feedback.
At this point the answer is it depends (: (On availability, price etc..)
To add a bit more context to this matter, I believe I'm somewhat limited
by my measurement systems at Tau's of significantly less than 100 seconds or
so (I've got two 5370B's and a Tek 2252 scope that can work as Time
interval counter and feed data into time lab, each instrument has it's pros and
cons but I don't have a lot of confidence in my measurements at Tau's of
less than 100 seconds where as measurements at 100 seconds and greater a
repeatable between different instruments etc..)
In the long run I'll probably look at getting equipment to measure shorter
tau's and phase noise but that's another project for another year or more
likely another decade, but getting an OCXO now that would be usefull later
on makes some sense as well.
If I had to put a stick in the ground I'd likely settle for 5E-13 or less
at a tau of 100 seconds. I'm not that worried about performance at
shorter tau's at this time. I realize that OCXO's typically exceed their specs
if left running in a stable environment (as I suspect my FTS 1050 is doing.)
Thanks for the comments about the HP 5065.
Regards
Mark
--- On Thu, 12/8/11, EWKehren at aol.com <EWKehren at aol.com> wrote:
> From: EWKehren at aol.com <EWKehren at aol.com>
> Subject: Re: [time-nuts] High end OCXO alternatives (or maybe an high
perf Rb ?)
> To: time-nuts at febo.com
> Received: Thursday, December 8, 2011, 10:00 AM
> Mark
> 10E-13 at 100 sec is a wide range. What about at 1
> and 10 sec. and are
> you talking about 3, 5, 9 E-13.
> I personally have quite a few 10811's that brake the 1E-12
> from 1 to 100
> seconds my best OCXO is a Datum 1000 that is 3.5E-13 at 1
> sec. and 4 at 10
> and 7 at 100 sec. I control it with a FRK-H which has 7E-13
> at 100 sec.
> In this range short of a $ 15 000 Oscilloquartz the best is
> a HP 5065. They
> all are below 1 E-12 some as low as 1E-13 at 100
> sec. but the only way I
> know how you know what you are getting is work with Corby
> Dawson.
> Bert Kehren
>
>
> In a message dated 12/7/2011 9:41:56 P.M. Eastern Standard
> Time,
> mspencer12345 at yahoo.ca
> writes:
>
> 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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