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 <[email protected]> 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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