[time-nuts] Different Thunderbolt versions
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Wed Feb 25 20:32:40 UTC 2009
Said
Specified Allan deviation is 2E-11 @1s.
Bruce
SAIDJACK at aol.com wrote:
> Hi Ulrich,
>
> notice that that plot also conveniently cuts-off the ADEV below 10s, where
> we can see it go up substantially at around 10s...
>
> Guess they did not want anyone seeing their <10Hz performance; this is
> called good specmanship.
>
> bye,
> Said
>
>
> In a message dated 2/25/2009 00:25:27 Pacific Standard Time,
> df6jb at ulrich-bangert.de writes:
>
> It should be noted that this plot shows a VERY PESSIMISTIC (almost two
> decades) behaviour of the GPS 1 pps, perhaps a remainder from SA and/or a
> not so well timing receiver.
>
> A M12+ would have its sawtooth corrected 1 pps at 2-4E-12 @ 1000 s, giving a
> crosspoint to the AD of the rubidium alone anywhere between 1000s and 10000
> s.
>
> Best regards
> Ulrich
>
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