Hi Tom,
Bill has actually published detailed schematics etc here:
http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf
Btw. what do you think about his small DMTD system?
http://www.wriley.com/A%20Small%20DMTD%20System.pdf
Adrian
Tom Van Baak schrieb:
Hi Bob,
The TPLL method is described by NIST:
http://tf.nist.gov/phase/Properties/one.htm
A few years ago it was re-developed by WarrenS, a dedicated and frequent
contributor to this list.
See also John Miles excellent report: http://www.ke5fx.com/tpll.htm
Or if that's dead, see
http://web.archive.org/web/*/http://www.ke5fx.com/tpll.htm
It's nice that W.J. Riley also tried it. If you know Bill, he makes us all look
like amateurs.
We know cases where TPLL works quite well; there are other cases where it
doesn't. It would be nice if either Warren or John or Bill or anyone else
posted a real schematic and BOM so that others could reliably duplicate,
corroborate, refute, or refine their results. For some reason, it's like a big
mystery; very unlike what we try to foster here on time-nuts: the free sharing
of information, methods, experience, designs, results, and conclusions.
/tvb
----- Original Message -----
From: "Robert Darby" <[email protected]>
To: <[email protected]>
Sent: Wednesday, January 30, 2013 10:32 AM
Subject: [time-nuts] Riley paper on Tight Phase Lock Loop
Gentlemen,
I've been a lurker on this list since early in 2012. I do not possess a
technical background but do have some interest in time measurement topics.
I was reading some of W. J. Riley's papers and saw that after the long
and contentious discussion on this list Mr Riley built and tested a
tight phase lock loop system.
I have failed to turn up any mention of his paper on this list and was
curious if anyone has read it or perhaps duplicated it?
He writes "HP 10811 ovenized crystal oscillators are used as both the
locked oscillator and PLL reference, and the system thus measures the
combined instability of two presumed identical and uncorrelated
devices." He further notes that "These results agree well with other
measurements for this type of crystal oscillator."
The paper is found at:
http://www.stable32.com/Frequency%20Stability%20Measurements%20Using%20a%20Tight%20Phase%20Lock%20Loop.pdf
The construction is described in greater detail in a separate paper:
http://www.stable32.com/A%2010%20MHz%20OCVCXO%20and%20PLL%20Module.pdf
The OCVCXO and PLL Board described therein appears to be a very
versatile piece of gear for anyone using 10811's. Riley gives an
example using the module to clean-up the output of a LPRO-101 rubidium
(page 9).
Regards,
Bob Darby
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