[time-nuts] 60Hz extra PPS: got one

Azelio Boriani azelio.boriani at screen.it
Fri Aug 10 06:33:19 EDT 2012


What do you mean with "it finds noise"? When the PLL can no longer track
the sinewave? I think that a simulator with such a behaviour must be
written specifically for that capability.

On Fri, Aug 10, 2012 at 10:51 AM, Hal Murray <hmurray at megapathdsl.net>wrote:

> Actually, there were 2 extra pulses.
>
> Here is the PPS view:
>
> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
> (Samples every 10 seconds.)
>
> Here is the audio view:
>   http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png
>   http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a1.png
> (16 bit audio, 8 KHz)
>
> I noticed a couple of other fishy areas:
>   http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-b0.png
>   http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-b1.png
> They didn't confuse the PPS collector.
>
> I'm probably overlooking lots of similar glitches.  I only noticed that
> pair
> because the first one happened at the bottom of a cycle and that was big
> enough to stand out.  I noticed the second one because it was close enough
> to
> the first one.
>
> Anybody got software to emulate a PLL?  I'm looking for something that will
> track a sine wave and tell me when it finds noise.
>
> I haven't seen any of the ground problems in the last day or so.  I don't
> know if that is just luck or if upgrading to Fedora 17 fixed something.
>  (Or
> maybe I accidentally fixed something.)
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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