[time-nuts] Testing a LPRO RB

Ulrich Bangert df6jb at ulrich-bangert.de
Thu Feb 16 13:23:35 UTC 2012


Nicholls et al are mentioned and they hold the patent as shown in the
attached pic...

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Azelio Boriani
> Gesendet: Donnerstag, 16. Februar 2012 13:35
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Testing a LPRO RB
> 
> 
> There is no mention in the AN1002 (GPS disciplined Stratum 2 
> clock) of the US patent 7,711,230 and that patent (on optical 
> waveguides) has no mention of temperature correction or 
> tempco extraction...
> 
> On Thu, Feb 16, 2012 at 8:55 AM, Ulrich Bangert 
> <df6jb at ulrich-bangert.de>wrote:
> 
> > Mark,
> >
> > > John DuBois and I did
> > > quite a bit of work to find a way to unwind the osc 
> parameters from 
> > > the available unstabilized reported data using SciLab on the log 
> > > files,  but nothing seemed to work reliably.
> >
> > For some information on how to do that have a look at 
> Analog Devices 
> > application note AN-1002 and at the there mentioned US patent US 
> > 7,711,230.
> >
> > Best regards
> > Ulrich Bangert
> >
> > > -----Ursprungliche Nachricht-----
> > > Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] 
> > > Im Auftrag von Mark Sims
> > > Gesendet: Donnerstag, 16. Februar 2012 01:56
> > > An: time-nuts at febo.com
> > > Betreff: [time-nuts] Testing a LPRO RB
> > >
> > >
> > >
> > > Lady Heather's osc drift rate calculation does assume that
> > > the temperature has been stabilized.   John DuBois and I did
> > > quite a bit of work to find a way to unwind the osc 
> parameters from 
> > > the available unstabilized reported data using SciLab on the log 
> > > files,  but nothing seemed to work
> > > reliably.   Generally the data analysis croaked because of
> > > things like noise and matrix singularities.
> > >
> > > Also,  if you do stabilize the temperature,  it is very easy
> > > to get the osc tempco.   Just turn off the stabilization and
> > > see how the osc drifts as it warms up.
> > >
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> >
> >
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