Hi
Close in, it looks like it's pretty much the crystal and the loading of the
bridge oscillator.
Bob
On Sep 29, 2012, at 11:46 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
The E1938A uses a crystal that is basically the same as
the 10811 crystal except that it is in a reduced
I recently modified an old 10811 to bring out the crystal
leads on miniature coax (instead of having them connect
to the oscillator circuit). This allowed me to measure
the crystal's inherent flicker noise of frequency.
The measurements indicate that the 10811 phase noise out
to at least 100 Hz
.
Thanks;
Thomas Knox
Date: Sun, 30 Sep 2012 10:03:03 -0700
From: rich...@karlquist.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] E1938A PN measurments
I recently modified an old 10811 to bring out the crystal
leads on miniature coax (instead of having them connect
to the oscillator
be interesting to here how you would approach the next
quartz industry standard. The next generation Blue-Top or BVA.
Thanks;
Thomas Knox
Date: Sun, 30 Sep 2012 10:03:03 -0700
From: rich...@karlquist.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] E1938A PN measurments
I
Would this characteristic be similar across all 10811s or would there be
as much unit to unit variation as there is for aging and Allan Deviation?
Ed
On 9/30/2012 11:03 AM, Richard (Rick) Karlquist wrote:
I recently modified an old 10811 to bring out the crystal
leads on miniature coax
I only measured one 10811. However, John Vig's tutorial
(available at IEEE UFFC) rather categorically states that
piezoelectric resonators have flicker noise of frequency.
What I measured was most closely related to phase noise,
as opposed to Allan Deviation. Phase noise of 10811's is
more
On 09/30/2012 09:49 PM, Richard (Rick) Karlquist wrote:
I only measured one 10811. However, John Vig's tutorial
(available at IEEE UFFC) rather categorically states that
piezoelectric resonators have flicker noise of frequency.
What I measured was most closely related to phase noise,
as opposed
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low have you seen, I have the opportunity
to test 40+ units and hope to find a few even better ones. Any guidance will
be appreciated.
My best reference is 3 E-13 so any thing as
Bert,
When you do tests like this, how long do you let the oscillators settle prior
to testing?
Doc
Sent from my iPad
On Sep 30, 2012, at 4:23 PM, ewkeh...@aol.com wrote:
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low
Doc
The units I mentioned have been done by Corby, but I let units run two
weeks before I do any test. In the future when I do the 40+ two a week running
parallel and the best rerun after 4 week soak.
Bert
In a message dated 9/30/2012 7:55:43 P.M. Eastern Daylight Time,
On 9/30/2012 2:20 PM, Magnus Danielson wrote:
With two such offset 10811s you could use DMTD methods or for that
matter cross-correlation phase noise measures to more directly measure
the units. That way you would have avoided the golden unit issue,
since the phase noise of those would
Sorry I have never seen those statistics.
Rick
On 9/30/2012 2:23 PM, ewkeh...@aol.com wrote:
Rick
I have some 10811's all below 1 E-12 in the 1 to 100 sec. range, a few as
low as 4 E-13 at 10 seconds. How low have you seen, I have the opportunity
to test 40+ units and hope to find a few even
I have a corby ocxo (datum-c) that I am coupling with a fury oem board soon
(need some connectors). I wish someone with good measurement equipment lived
nearby. I would like to measure this vs my standard fury. I think the ocxo is
mid 10-13 at 1s. Anybody near Kansas City?
Doc
Sent
On 10/01/2012 02:05 AM, Richard (Rick) Karlquist wrote:
On 9/30/2012 2:20 PM, Magnus Danielson wrote:
With two such offset 10811s you could use DMTD methods or for that
matter cross-correlation phase noise measures to more directly measure
the units. That way you would have avoided the
For those that have Timelab the link to the E1938A PN measurement data is:
https://dl.dropbox.com/u/59708595/E1938A.tim
Bruce
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On 09/29/2012 02:45 PM, Bruce Griffiths wrote:
For those that have Timelab the link to the E1938A PN measurement data is:
https://dl.dropbox.com/u/59708595/E1938A.tim
Thank you. I will measure mine so that we can compare them.
Cross-correlation with a pair of BVAs should do it.
Cheers,
Magnus Danielson wrote:
On 09/29/2012 02:45 PM, Bruce Griffiths wrote:
For those that have Timelab the link to the E1938A PN measurement
data is:
https://dl.dropbox.com/u/59708595/E1938A.tim
Thank you. I will measure mine so that we can compare them.
Cross-correlation with a pair of BVAs
The E1938A uses a crystal that is basically the same as
the 10811 crystal except that it is in a reduced height
package. However the phase noise is not as good as a
10811 due to broadband noise in the automatic frequency
control circuit. By the time I discovered this, it
was too late to try to
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