mag...@rubidium.dyndns.org said:
I use the rule of thumb that 1 ns is 3 dm in free air and 2 dm in coax and
fibre
My rule of thumb is that fiber or good coax (foam) slows down by the
conversion from km to miles.
--
These are my opinions, not necessarily my employer's. I hate spam.
Joe,
A possible mechanism occurs to me. High-precision GPS is
very vulnerable
to multipath errors. A loos connector will have a
significant reflection.
The reflected energy will propagate backwards, and be reflected off
the
transmitter output discontinuity, the twice-reflected energy
Da: b...@lysator.liu.se
Data: 24/02/2012 14.42
A: Discussion of precise time and frequency measurementtime-nuts@febo.com
Is it known which GPS receiver type was used in the Neutrino experiment?
It was a Septentrio PolaRx2e. See the paper on setup and procedures:
On Fri, Feb 24, 2012 at 3:41 PM, iov...@inwind.it iov...@inwind.it wrote:
Da: b...@lysator.liu.se
Data: 24/02/2012 14.42
A: Discussion of precise time and frequency measurementtime-nuts@febo.com
Is it known which GPS receiver type was used in the Neutrino experiment?
It was a Septentrio
Da: b...@lysator.liu.se
Data: 24/02/2012 14.42
A: Discussion of precise time and frequency
measurementtime-nuts@febo.com
Is it known which GPS receiver type was used in the Neutrino experiment?
It was a Septentrio PolaRx2e. See the paper on setup and procedures:
At 3:24 PM + 2/24/12, time-nuts-requ...@febo.com wrote:
Date: Fri, 24 Feb 2012 14:42:36 +0100
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Neutrinos not so fast? (defective connector)
Bj?rn,
[snip
On Wed, Feb 22, 2012 at 11:26 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
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
Hi Javier,
On 02/23/2012 09:42 AM, Javier Serrano wrote:
So please stay tuned for proper information. That's all I can say for now.
Which is more or less all you should say. I agree fully with you.
From a scientific point of view, all we have heard is indications, but
it needs to be
I have found the official CERN director's words: (from Marco URLs)
Ecco l’annuncio del Direttore del CERN:
The OPERA collaboration has informed its funding agencies and host
laboratories that it has identified two possible effects that could have an
influence on its neutrino timing measurement.
Just for completeliness I was pointed to this information:
http://www.nature.com/news/flaws-found-in-faster-than-light-neutrino-measurement-1.10099
Arnold
Am 23.02.2012 12:21, schrieb Azelio Boriani:
I have found the official CERN director's words: (from Marco URLs)
Ecco l’annuncio del
Yes, this doesn't mean the results are necessarily wrong but only
questionable. Too bad we have to wait until May to know the damage
extension on the observed results. Here in Italy, unfortunately and as
usual, the announcement was distorted by our media today: now Einstein is
the winner as much
Thanks Azelio,
so let's wait for domani ;-) ,
Arnold
Am 23.02.2012 15:12, schrieb Azelio Boriani:
Yes, this doesn't mean the results are necessarily wrong but only
questionable. Too bad we have to wait until May to know the damage
extension on the observed results. Here in Italy,
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
performed the Opera experiment.
He told me that
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
Am 23.02.2012 15:24, schrieb Alberto di Bene:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
I recommend the differential pair: here the trigger have to sense the
crossing of the two signals and this crossing is well definite.
On Thu, Feb 23, 2012 at 3:36 PM, Jim Lux jim...@earthlink.net wrote:
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp
On 02/23/2012 03:36 PM, Jim Lux wrote:
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the
And by using a differential pair is like halving the rise time: when one
arm rises the other falls, effectively doubling the speed of the crossing
and the sharpening of the trigger event. Sort of auto_ schmitt_trigger...
On Thu, Feb 23, 2012 at 3:45 PM, Azelio Boriani
To square a sine 10MHz you can use a 4:1 transformer with the center tap:
connect the tap to GND and use a differential line receiver (ADM485,
MAX485) connected to the differential signal that comes out from the
transformer. The input of the transformer receives the single ended sine
10MHz.
On
A transformer or differential signaling would also have the virtue of
allowing easy galvanic isolation to prevent ground loops.
Fiber optic and line receivers often set their switching threshold
using a positive and negative peak detector. The same design works
very well for analog peak to peak
, February 23, 2012 9:37 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60
-nuts-boun...@febo.com wrote on 02/22/2012 06:31:54 PM:
From: Jim Palfreyman jim77...@gmail.com
To: rich...@karlquist.com, Discussion of precise time and
frequency measurement time-nuts@febo.com
Date: 02/22/2012 06:32 PM
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
Sent
To: time-nuts@febo.com
From: gw...@raytheon.com
Date: Thu, 23 Feb 2012 13:57:11 -0500
CC: time-nuts-boun...@febo.com
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
A possible mechanism occurs to me. High-precision GPS is very vulnerable
to multipath errors
[mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Knox
Sent: Thursday, February 23, 2012 2:47 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
It is hard to believe that they would go public with such earth shaking
results
based
A possible mechanism occurs to me. High-precision GPS is very vulnerable
to multipath errors. A loos connector will have a significant reflection.
The reflected energy will propagate backwards, and be reflected off the
transmitter output discontinuity, the twice-reflected energy propagating
Björn,
time-nuts-boun...@febo.com wrote on 02/23/2012 04:53:06 PM:
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: 02/23/2012 04:53 PM
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
Sent by: time-nuts-boun
From
http://news.sciencemag.org/scienceinsider/2012/02/breaking-news-error-undoes-faster.html?ref=hp
:
BREAKING NEWS: Error Undoes Faster-Than-Light Neutrino Results
...
It appears that the faster-than-light neutrino results, announced
last September by the OPERA collaboration in Italy, was
It depends on the meaning of bad connection... was it not correctly
seated in the connector and so distant from the optical receiver? We
don't know... hope someone can tell or the experiment be repeated.
On Wed, Feb 22, 2012 at 9:41 PM, Marco IK1ODO ik1...@spin-it.com wrote:
From
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.
/tvb (iPhone4)
On Feb 22, 2012, at 12:41 PM, Marco IK1ODO ik1...@spin-it.com wrote:
Well, timenuts friends, how may a fiberoptic bad connection
Yes, so it can help knowing what kind of adapter is being used.
On Wed, Feb 22, 2012 at 10:32 PM, Tom Van Baak (lab) t...@leapsecond.comwrote:
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.
In message 9a458dba-3875-43b2-8383-5ca2f86be...@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
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
The Great American Philosopher George Wallace (racist former governor of
Alabama) supposedly said, If those university professors are so smart why
can't they park their bicycles in a straight line?
Those OPERA Collaboration scientists should hire my ex-wife. She could help
them out a lot. Her
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.
Jim
On 23 February 2012 09:57, Rick Karlquist rich...@karlquist.com wrote:
Maybe they checked the connector by replacing
The explanation is that the connector was loose, by 20 meters. Hard
to believe the signal can jump a 20 meter air gap but apparently so.
--
Chris Albertson
Redondo Beach, California
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Examples of GPSDO, rise time, impedance and trigger level:
http://www.leapsecond.com/pages/gpsdo-rise/
/tvb (iPhone4)
On Feb 22, 2012, at 2:26 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 9a458dba-3875-43b2-8383-5ca2f86be...@leapsecond.com, Tom Van
Baak
(lab) writes:
In message b81e52be-e1b5-430e-bdb0-5e54d9728...@leapsecond.com, Tom Van Baak
(lab) writes:
Examples of GPSDO, rise time, impedance and trigger level:
... But no examples of *fiber* connector being involved.
I simply don't buy the story that tightening the connector makes
a consistent 60
:45 -0800
To: time-nuts@febo.com
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
Examples of GPSDO, rise time, impedance and trigger level:
http://www.leapsecond.com/pages/gpsdo-rise/
/tvb (iPhone4)
On Feb 22, 2012, at 2:26 PM, Poul-Henning Kamp p...@phk.freebsd.dk
I read that the news came from sources familiar with the experiment. Is there
any official press release? Or only rumors?
Antonio I8IOV
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Indeed cold fusion is here again... in Italy... google Rossi-Focardi, if
interested.
Yes, I'm actually struggling finding something about this news flash...
On Thu, Feb 23, 2012 at 1:35 AM, iov...@inwind.it iov...@inwind.it wrote:
I read that the news came from sources familiar with the
On 02/22/2012 11:26 PM, Poul-Henning Kamp wrote:
In message9a458dba-3875-43b2-8383-5ca2f86be...@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
Try this:
http://www.nature.com/news/flaws-found-in-faster-than-light-neutrino-measurement-1.10099
On Thu, Feb 23, 2012 at 2:10 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 02/22/2012 11:26 PM, Poul-Henning Kamp wrote:
In
On 02/23/2012 02:14 AM, Azelio Boriani wrote:
Try this:
http://www.nature.com/news/flaws-found-in-faster-than-light-neutrino-measurement-1.10099
Still unverified rumours level. Best article so far thought.
Cheers,
Magnus
___
time-nuts mailing list
] Neutrinos not so fast? (defectove connector)
Indeed cold fusion is here again... in Italy... google Rossi-Focardi, if
interested.
Yes, I'm actually struggling finding something about this news flash...
On Thu, Feb 23, 2012 at 1:35 AM, iov...@inwind.it iov...@inwind.it wrote:
I read
] Neutrinos not so fast? (defectove connector)
On 02/22/2012 11:26 PM, Poul-Henning Kamp wrote:
In message9a458dba-3875-43b2-8383-5ca2f86be...@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
Tightening up a connector may make a few pSec difference, in terms of
absolute delay length, but it could have a very large effect if it
caused enough reflection - then the entire time-length of the cable,
or some multiple of it, would come into play.
Ed
On 2/22/12 2:26 PM, Poul-Henning Kamp wrote:
In message9a458dba-3875-43b2-8383-5ca2f86be...@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
Why would this (60ns error, and connector issue) have not shown up in
the time transfers and validations done by the labs cited?
Brent
On Wed, Feb 22, 2012 at 11:03 PM, Jim Lux jim...@earthlink.net wrote:
On 2/22/12 2:26 PM, Poul-Henning Kamp wrote:
In
At 01:35 23-02-12, you wrote:
I read that the news came from sources familiar with the
experiment. Is there
any official press release? Or only rumors?
Antonio I8IOV
Antonio, vedi Battiston su Le Scienze
sorry for previous message in Italian, had to be a personal one :-)
Marco IK1ODO
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