[time-nuts] Testing a LPRO RB

Azelio Boriani azelio.boriani at screen.it
Thu Feb 16 13:50:25 UTC 2012


Now it is clear: you at first wrote US patent 7,711,230:

> > 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.

but it is US 6,711,230.


On Thu, Feb 16, 2012 at 2:23 PM, Ulrich Bangert <df6jb at ulrich-bangert.de>wrote:

> 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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