[time-nuts] New wrist watch

[Dave Martindale]

Two data points for one watch:
When I bought a Casio PAW-1300, it was about 20 seconds fast.  It said that
it had last synced on September 24, but that information does not include
the year.  It was now June 10, so it had been running without a radio sync
for at least 9 months (though it could have been 9 months plus 1 year, or
plus 2 years...).  If we assume the delay is only 9 months for 20 seconds
of error, that's a error of about 2.8 seconds/month or about 1 PPM.

A year later, the same watch got stored in a drawer where there was no
light and poor radio reception.  After 26 days without a successful radio
sync, it had gained 2 seconds.

(On the other hand, the watch does *not* handle a leap second when the leap
second actually occurs.  It simply keeps counting, so it ended up being 1
second fast after the recent June 30 leap second.  It was correct the next
morning, after its usual overnight sync to Colorado.)

I normally leave the watch on the window ledge of a window approximately
facing Colorado (I'm near Toronto).  It gets lots of light to keep the
battery charged, and reliably syncs every night.  It has become my "master"
time source that I sync all my other watches to when adjusting them.
 (Someday I need to build a time display for one of my GPS receivers, but
the Casio works well enough).

- Dave

On Mon, Jul 6, 2015 at 6:45 PM, D W <watsondaniel3 at gmail.com> wrote:

> With my new found interest in time nuttiness I thought I should upgrade to
> a decently accurate watch. I had some features I was looking for and
> settled on a Casio Wave Ceptor. My second choice was an Eco Drive, but the
> Casio had the right mix of features at a good price.
>
> As I was sitting outside reading the manual after buying it, I laid it
> flat on the table and started a manual sync to WWVB. The UI is pretty
> intuitive for having so few buttons and indicators. It quickly told me that
> it had found a stable signal, and about six minutes later it was synced.
> Pretty cool.
>
> Anyone know what the drift is like in this watch if it can't find the
> signal for several days/weeks? I would hope that actual performance is a
> little better than the +/- 15 sec per month stated in the manual. I should
> trap it in a faraday bag for a while to test it...
>
> Dan
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