[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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