Several years ago I spotted a clever PIC-based software (DSP-ish)
approach to WWVB modulation
Perhaps it was mine?
Years ago I designed a PSK31 decoder using a PIC. It worked very well
for fixed frequencies, but I concluded that making it tunable was beyond
the resources of the PICs then available.
If I remember correctly, it used a simple delay line and multiplied the
early and late version of the signal. Most of the overheads were in
synchronisation and decoding the Varicode modulation.
I imagine it would be fairly easy to get it working for WWVB. All it
would take would be sufficient enthusiasm. Something I have a shortage
of these days :-)
.............. Zim ............ VK3GJZ
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