[time-nuts] Neutrinos not so fast? (defectove connector)
jim77742 at gmail.com
Wed Feb 22 23:31:54 UTC 2012
Maybe the loose connector meant the clock at one end *never* synced with
the GPS and just happened to be 60ns fast. Tighten the connecter, clock
resyncs, problem solved.
On 23 February 2012 09:57, Rick Karlquist <richard at karlquist.com> wrote:
> Maybe they checked the connector by replacing the whole
> fiber optic cable with a new one, and while doing that
> had the "oh sh.." moment of realizing the length of the
> old one was 20 meters different than it was supposed to be.
> I think this sort of thing has happened to all of us
> with significant experience. Or maybe the cable was marked
> with an incorrect length (not due to error by the experimenters)
> and they forgot "trust but verify". We've probably all
> gotten bit by that one as well.
> Poul-Henning Kamp wrote:
> > In message <9A458DBA-3875-43B2-8383-5CA2F86BE8E2 at leapsecond.com>, "Tom
> > Baak
> > (lab)" writes:
> >>Could be on the electrical side of the adapter, not the optical
> >>side. It's not impossible to get 60 ns of phase or trigger error
> >>with RF connectors.
> > I don't buy that explanation.
> > It's very hard to get 60 ns *consistent* phase or trigger error,
> > with any kind of connector, almost no matter how you go about it.
> > 20m of extra fiber sounds *much* more plausible.
> > Inventing an excuse about a loose connector to cover up the mistake
> > sounds even more plausible.
> > You really don't want to defend your phd dissertation, being known
> > as the idiot who made a fool of both CERN and SanGrasso in one go.
> > --
> > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> > phk at FreeBSD.ORG | TCP/IP since RFC 956
> > FreeBSD committer | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by
> > incompetence.
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