[time-nuts] Phase noise confusion II

[Dana Whitlow]

I once got into that "p-p" business and it was like pulling teeth to get
the customer
even semi-reasonable.  He finally agreed to stipulate that the p-p value
could be
construed as 6 X the rms value.

Dana


On Fri, Apr 10, 2020 at 6:57 AM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> Which of the multitude of definitions are we talking about?
>
> One very common definition looks at peak to peak jitter and does
> not care about the center. Another looks at +/- peak to edge and
> then uses the greater of the two numbers. Other definitions look
> at RMS jitter and generally don’t care about the edge.
>
> At least to me, the biggest problem is that any time “peak” or “peak
> to peak” comes in to a calculation that involves random noise,
> things go sideways fast. People pretty much never want to
> define a confidence level (how any sigma?). They want an
> absolute number.
>
> Lots of fun
>
> Bob
>
> > On Apr 10, 2020, at 6:05 AM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
> >
> > Question about definition of jitter:   Is it the variation in
> > pulse-to-pulse spacing, or is it
> > the variation in pulse positions with respect to a jitter-free waveform?
> >
> > Dana
> >
> >
> > On Thu, Apr 9, 2020 at 11:21 PM Hal Murray <hmurray at megapathdsl.net>
> wrote:
> >
> >>
> >> richard at karlquist.com said:
> >>> There is always an implied clock recovery loop that the the jitter is
> >>> measured against. The loop may itself affect the jitter measurement
> >> either by
> >>> cleaning up jitter or contributing to it.
> >>
> >> Interesting.  I hadn't thought about it that way.
> >>
> >> Suppose I measure the edge to edge times and make a histogram.  Can I
> get
> >> jitter out of that?  Where is the clock recovery loop?
> >>
> >> --
> >> These are my opinions.  I hate spam.
> >>
> >>
> >>
> >>
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