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

[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 Thu, Feb 23, 2012 at 3:51 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> 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 <azelio.boriani at screen.it>wrote:
>
>> 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 <jimlux at earthlink.net> 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 leader of the team
>>>> that
>>>>    performed the Opera experiment.
>>>>    He told me that the badly seated connector caused the amplitude of
>>>> the
>>>>    signal to be lower, and for this reason the trigger point, which was
>>>>    set at a specific level, was reached 60ns later.
>>>>    73  Alberto  I2PHD
>>>>
>>>
>>>
>>>
>>> Darn those finite rise times<grin>
>>> I've been bitten more than once by this very phenomenon (which I admit
>>> doesn't say a lot for me.. being bitten once is ok, but since I've had
>>> multiple bites...)
>>>
>>> But this brings up an interesting time-nut problem for the hive mind..
>>>
>>> If you had to design some scheme for interconnecting "boxes" and wanted
>>> to transmit an accurate time sync, what should it look like, so that you're
>>> insensitive to things like rise time.
>>>
>>> (maybe this harkens back to the discussion about 10 MHz, why sine vs
>>> square wave distribution)
>>>
>>> It has to be a single signal (maybe a differential pair), because
>>> otherwise, don't you have potential for skew between the multiple signals.
>>>
>>> Zerocrossing sort of works, if you take only one direction, but does
>>> asymmetry of the waveform screw you up?  (e.g. what's "zero".. is it half
>>> way between peak values + and -?)
>>>
>>>
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>>
>>
>