[time-nuts] New WWVB modulation format receivers

[Graeme Zimmer]

> 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