[time-nuts] Setting up PRS10 with M12+T GPS

Azelio Boriani azelio.boriani at screen.it
Wed May 2 22:54:55 UTC 2012


Maybe the 10MHz and the PPS are not exactly aligned but you can see that
the "persistance" of the 10MHzB (blue trace) is exactly the same of the PPS
B (red trace), so they are absolutely consistent and perfectly "linked"
together.

On Thu, May 3, 2012 at 12:42 AM, <bg at lysator.liu.se> wrote:

> > Yes, all made clear.
> > Trigger on Ch.4, I see. You have written "green: 10MHz PRS10B" but it
> must
> > be A, otherwise it seems that the PPS and the 10MHz of the PRS10 are not
> > phase aligned. Moreover, the PRS10B seems to track the PRS10A with "some
> > delay" as the 10MHz from A spreads on more than 5nS (useful, the infinite
> > persistence, isn't it? I use it a lot)
> >
> >
>
> I had
>
>    locked Tbolt 1PPS going into PPS_IN of PRS10A
>    PPS Out of PRS10A going into PPS_IN of PRS10B.
>
> I watched/measured
>    1) PPS out from Tbolt on ch 1  (yellow)
>     2) 10MHz out from PRS10A on ch 2 (green)   // Corrected
>    3) 10MHz out from PRS10B on ch 3 (blue)    // Corrected
>     4) 1PPS out from PRS10 B on ch 4 (red)
>
> I should do some proper measurements with TIC, instead of just 'watching'
> on the scope. Yes the 1pps and 10MHz is ofcause stable within the same
> PRS10. But should not the 10MHz zero crossing be aligned with the 1PPS?
> Cables were not perfectly matched, but should be within 2-3ns of each
> other.
>
> Yes, persistance is very nice!
>
> --
>
>   Björn
>
>
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