[time-nuts] My Casio G-Shock watch and other fun stuff
Brooke Clarke
brooke at pacific.net
Thu Jun 21 01:07:23 EDT 2007
Hi Jim:
I'd bet a dollar to a donut that watch is using the C-Max time code receiver.
The best 32768 Hz non oven oscillator I've seen is the Maxium (was Dallas Semi)
DS3231. The old DS32KHZ was/is a very good TCXO, but the DS3231 improves on it
in many ways, one of which is a digital frequency tweak to 0.1 ppm.
Time signal fixes would give you a history that could be used not only to bring
the frequency back on, but also to look at aging and temperature corrections.
So a really smart timepiece after running with a time signal for some time
would then be customized to continue running without the time signal and keep
very good time.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
Palfreyman, Jim L wrote:
> John,
>
> My watch is one of these:
>
> http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=120108656745
>
> (Casio module 3050)
>
> I was wondering whether it was good design on Casios part - i.e.
> discipline the oscillator based on the radio signal, but if yours is off
> then that throws that idea out the window. Is it the same watch?
>
> I really need another unit as a control.
>
>
>
> Jim Palfreyman
>
>
> -----Original Message-----
> From: Neon John [mailto:jgd at johngsbbq.com]
>
>
>>I reported the unusual accuracy of my Casio G-Schock radio controlled
>>watch (with the radio controlled feature turned off) a month or so
>
> back.
>
>>Well to back up my rough observations I decided to measure it properly.
>
>
> I'm just impressed with your watch. My G-Shock stumbles all over itself
> when the radio signal is missed, varying over a second a day. Sounds
> like you got a good manufacturing "outlier".
>
>
> John
> --
> John De Armond
> See my website for my current email address http://www.neon-john.com
> http://www.johndearmond.com <-- best little blog on the net!
> Cleveland, Occupied TN
> Alcohol, Tobacco & Firearms should be a convenience store, not a
> government agency.
>
>
>
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