[time-nuts] Low power timekeeping

[Jean-Louis Oneto]

Keeping a "GPSDWW" buried in a deep hole in ground make me feel like a 
graveyard, since the "wrist" should be buried as well...
I'm not sure that even time-nuts need precise time in after-life?
(Sorry, I didn't resist :-) )
Jean-Louis Oneto

Le 26/09/2012 04:48, Chris Albertson a écrit :
> On Tue, Sep 25, 2012 at 7:19 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
>
>> How good a clock could you get at much lower power?  I guess I'm looking
>> for something (logarithmically) between a watch and a GPSDO.
>>
> The trick to ultra-low power, I think, is to not run the GPS receiver full
> time.  If you literally want something between a wrist watch and a GPSDO
> then build a "GPS disciplined wrist watch" GPSDWW.  Let the watch run open
> loop until  say an hour then turn on the GPS for a few seconds, adjust the
> watch then power off the GPS.   Likely you'd use something better then a
> watch crystal but almost as low power
>
> Rather then spend a lot of energy with a heater and oven to stabilize the
> temperature I think you can dig a deep hole in the ground like a well and
> burry the oscillator and have an ultra stabile temperature for years.
>
> Chris Albertson
> Redondo Beach, California
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-- 
Jean-Louis Oneto
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