[time-nuts] 60 Hz line quirks, anybody recognize this stuff?

[Azelio Boriani]

I agree: I don't think this is possible on a power line. Better to use a
second sampling unit to check.

On Sat, Sep 1, 2012 at 3:30 PM, J. Forster <jfor at quikus.com> wrote:

> IMO, you have an instrumentation issue. I don't think the power grid can
> do anything like that.
>
> YMMV,
>
> -John
>
> ===============
>
>
>
> > The context is using the 60 Hz line for timing.
> >
> > I'm feeding 60 Hz from a wall wart transformer into a modem control
> signal
> > that the kernel PPS stuff watches.  Mostly, it works as expected, but
> > occasionally, it picks or drops a cycle.
> >
> > In order to understand what was going on, I fed the same signal into the
> > audio input and setup a job to capture the audio.  Here is an example of
> a
> > pick:
> >
> http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
> > 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
> >
> > OK, that somewhat makes sense.
> >
> >
> > Something happened several days ago.  I used to get picks/drops rarely,
> > say
> > ballpark of 1 a month.  Now I'm getting 10 or 20 per day.  So I started
> > looking closer.
> >
> > I'm now seeing stuff like this.  I've got lots and lots of examples.  I
> > added
> > a second PC with different hardware.  It sees the same stuff.
> >
> > Does anybody recognize this?
> >
> > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-a0.png
> > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-b0.png
> > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-c0.png
> > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-d0.png
> > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-e0.png
> >
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
> >
> >
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>
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