> I suggest that you buy a WWVB module and adjuat the frequency slightly wi=
th a new
> crystal. WWVB is a time/date signal from Ft Collins, CO USA sending at 60=
..00khz. The
> modules are available from Digikey for about
> $10 USD.

That would be a bit more than a small adjustment to get down to ELF frequen=
cies that are down around mains frequency ...


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