[time-nuts] Allan deviation -> finally some data!!!
df6jb at ulrich-bangert.de
Wed Oct 25 10:29:16 EDT 2006
the sigma-tau plot looks indeed strange! Can you send me the data file
for some tests with it?
73 de Ulrich, DF6JB
> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Didier Juges
> Gesendet: Mittwoch, 25. Oktober 2006 15:36
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Allan deviation -> finally some data!!!
> ---- Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> > >
> > The apparent behaviour of your 10811's is far too good!!
> > Over a period of 15,000 seconds the allan deviation should have
> > reached
> > a minimum and then increased as the effects of ageing
> manifest themselves.
> > Either the oscillators are injection locked or your
> analysis is suspect.
> > If the analysis were correct the performance approaches or even
> > exceeds
> > that of the most stable crystal oscillators ever built.
> > This is extremely unlikely something has to be wrong.
> > Bruce
> It looks as if (I do not know for a fact, but I will check
> tonight when I am back at home) I measured the 10811 against
> itself, instead of against the 5370's time base. So what is
> being displayed is the noise in the trigger circuits of the
> 5370 and the delay in the cables.
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