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" <bobda...@triad.rr.com> To: <time-nuts@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 > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
