[time-nuts] Testing a LPRO RB

Azelio Boriani azelio.boriani at screen.it
Thu Feb 16 12:35:08 UTC 2012


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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