Boston Linux Meeting Wednesday, October 20, 2010 Hardware Hacking: Atomic Clock Building

[John Abreau]

Hopefully Federico will chime in with more details about his talk.



On Thu, Oct 14, 2010 at 8:58 PM, Bruce Labitt
<bruce.labitt at myfairpoint.net> wrote:
>  On 10/14/2010 8:39 PM, Ric Werme wrote:
>>> From: Bruce Labitt<bruce.labitt at myfairpoint.net>
>>>     On 10/13/2010 9:25 AM, Jerry Feldman wrote:
>> [apologies for confused attributions.  Death to HTML Email.]
>>
>>> According to the announcement:
>>> "Using the lowest amount of custom hardware and pouring Perl and Shell
>>> Script over everything as the glue binding it all, we create a
>>> minimalistic device delivering a perfectly tuned network time source:
>>> your very own stratum-1 ntp server, turning a pocket-sized Sheevaplug
>>> device into your personal atomic clock."
>>> and http://en.wikipedia.org/wiki/NTP_server#Clock_strata
>>> snipped for your convenience:
>>> Stratum 0
>>> These are devices such as atomic (caesium, rubidium) clocks, GPS clocks or
>>> other radio clocks. Stratum-0 devices are traditionally not attached to the
>>> network; instead they are locally connected to computers (e.g., via an RS-232
>>> connection using a Pulse per second signal).
>>> Stratum 1
>>> These are computers attached to Stratum 0 devices. Normally they act as
>>> servers for timing requests from Stratum 2 servers via NTP. These computers
>>> are also referred to as time servers.
>>> I would think this implies the Sheevaplug is connected to a Stratum-0 source.
>>> What was the source that Federico used?  Anyone know?
>> So instead of building an atomic clock, it's really an exercise in RS-232 or
>> parallel port wiring?
>>
>> All the hype and none of the clock?
>>
>> My sister is a marine biologist.  I talked to her on the phone yesterday,
>> but that didn't make me a marine biologist.
>>
>>    -Ric Werme
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>> http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
>>
>>
> I went to the BLU site hoping to find more.  At least a clue
> on the clock.  But a talk on rs232 comms...  (All of the
> hype and none of the clock?)  I hope it is a lot more
> interesting than that!
>
> However, a direct connect to a WWV receiver technically can
> be a stratum-1 time server.
>
> Is it one of the chip scale atomic clocks?  That would be neat.
>
> -Bruce
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>



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John Abreau / Executive Director, Boston Linux & Unix
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