When HN users recommended it
2 HN users recommended this between 2016 and 2021, in 2 comments.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
2 HN users recommended this between 2016 and 2021, in 2 comments.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
The WWVB protocol has been interesting me for the past few months. I have been thinking about doing the opposite: building my own WWVB receiving station.
There are modules which can automatically receive the WWVB radio signal and output the high/low pulses (which still need to be translated from PWM to ones and zeros).
https://www.amazon.com/60kHz-atomic-clock-radio-module/dp/B0...
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If I were to make a recommendation: you're hiding a bit of magic here:
> I designed the board using the EAGLE PCB design software and milled the board from a single-sided FR-1 circuit board blank on an Othermill v2:
You haven't said the kinds of endmills you're using (flat square mills? Or did you use a V-tip?). If so, where did you source the V-Tips from? The software side probably had a few extra steps as well (IIRC, its usually Eagle -> Eagle CAM Plugin export -> CAM software -> GCode -> Mill)
So expanding on what you did here would be most helpful... to me at least :-)
> It’s challenging to design good antennas for such long wavelengths
FYI: the loopstick / Small Loop antenna operates on the magnetic-portion of the wave instead of the electric-portion of the wave. Instead of making a very large wire (which "receives" the voltage as the wave passes), the small loop antenna is basically an inductor that generates a current as the magnetic wave passes over it.
That's how it gets so small, since the electric wave is 5000-meters long, its a bit difficult to make.
https://www.amazon.com/CANADUINO-Atomic-Clock-Receiver-60kHz...
then the rest of it is basics for small PV charge controller, dc-dc converter, battery (such as to keep one good quality 18650 at an 85% float voltage)