[time-nuts] Neutrinos not so fast? (defectove connector)

Rick Karlquist richard at karlquist.com
Wed Feb 22 22:57:21 UTC 2012

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 Van
> 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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