rhubbell wrote: > You're saying use a soundcard since that would be the cheapest way? I > didn't know that was a possibility. I'll have to explore that and look > through the archive. Thanks for the tip.
Just keep in mind that most audio cards have a "DC hole" due to the 20 Hz high pass filter on their input. If you're looking for Schumann resonances, these will be at 7-30 Hz, so it won't work. You can multiply your incoming signal (in the analog domain) by a sine wave to move the frequencies off DC, then move it back down to baseband digitally with GNU Radio. (You'll need a PLL to synchronize the mixing frequencies.) I think someone has already done ELF with GNU Radio a few years ago, you can try Google. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
