[time-nuts] I've lucked it!

[Brooke Clarke]

Hi Jim:

It's common here in the U.S. for the LF clocks to only sync near local 
midnight.  How can  you tell if that's happening with your watch or not happening?

I just received one of the C-Max 8000 world mode 3 band LF time receivers, but 
am busy on another project now.  See:
http://www.prc68.com/I/Loop.shtml

I expect this is the chip used in your LF timing receiver since it's the only 
one I know of that automatically looks for all three frequencies.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com



Palfreyman, Jim L wrote:
> As posted previously I recently bought a cheap Radio Controlled
> multi-band travel clock off ebay and managed to receive the JJY signal
> from Japan here in Tasmania, Australia. But only in a certain part of my
> house.
> 
> Based on that, I bought a Casio G-Shock Multi Band Solar Radio
> Controlled all digital wrist watch.
> 
> Well the bad news was that it couldn't pick up the signal. I still need
> to go up a mountain at 3am with it, but certainly I haven't picked up
> anything with it yet - the travel alarm clock seems a lot more sensitive
> for some reason.
> 
> The good news is that when I got this watch I set it accurately by hand
> (of course!) and now two weeks later I still cannot detect any visible
> difference as the seconds tick over. In my past experiments I've found
> my eyes and ears together can detect at least a 100ms difference
> (possibly much better, but this is what I've tested).
> 
> So I wear this watch during the day, take it off at night and it has
> maintained an accuracy of under a 1/10 of a second in two weeks -
> roughly 2.5 seconds per year if we extrapolate it out.
> 
> Now maybe this is a well designed watch and they are all like that, but
> it got me thinking. Of all the millions of watch crystals out there must
> be some that just out of pure chance are brilliant time keepers. For any
> arbitrary level of precision (e.g. 1 sec per year) presumably there is a
> probability (e.g. 1 in a million) that there is a crystal than can keep
> that time based on my wrist temperature and various other watch wearing
> habits.
> 
> Have I scored it lucky??
> 
> P.S. I have double checked and can guarantee you the watch hasn't picked
> up a single LF time signal from anywhere!
> 
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