[time-nuts] Riley paper on Tight Phase Lock Loop

[Tom Van Baak]

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" <bobdarby at triad.rr.com>
To: <time-nuts at febo.com>
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
>