Dayam, my computer says 4:13 AM but my body and my clocks disagree.
I had one of those Casio "Atomic" watches for a while and it switched over automatically from the WWV time signals at Fort Collins. That was one less timekeeper I had to fuss with.
That got me interested in how they transmitted the signals. Turns out they xmit at 65 kHz, which is a wavelength of 4615.4 kilometers or 2900-ish miles if my arithmetic is correct.
Wow! And hams talk about the "DC Band" of 160 meters!*
So that made me wonder what the receiving antenna in the watch looked like.
Some of them look like fractal antennas:
http://cdn-static.cnet.co.uk/i/c/blg/cat/gadgets/atomic-watch-inside.jpgBut mine just had a teeny little loopstick antenna curved to fit inside the case with many many turns of really really fine wire.
Amazing.
Well, to me anyhow.
This is an early model.
http://cdn4.fashionablygeek.com/wp-content/uploads/2013/10/atomic-wristwatch.jpgSince mine had a plastic case, the hole in which the wristband pin fit finally broke out and was unrepairable, even with my consummate repair skills :), so I gave the still-working body to an enterprising young man who wanted to fiddle with it.
Well just more "Thoughts on Daylight Saving(s) Time".
Terry
* Hams speak of the 160 meter ham band, which is just above the AM broadcast band, as the "DC Band" because of the low frequency involved, 1.8 MHz, compared to other ham bands. As far as most hams are concerned, that low a frequency is almost down to "Direct Current," hence the time-honored joke about "the DC band."