Measuring ELF Signals

On this web page, the author tells about his experiences in receiving ELF waves in a frequency range between zero and approximately 25 Hz. Normally, this range should be completely free of signals, except those from the 16 Hz railway supply, the Schumann Resonance and a few natural signals, caused by solar activities. But to the author’s surprise, a number of obviously artificial signals seem to be sended out by some unknown sources permanently, created by electric currents flowing through the surface of the ground and only visible and hearable by using a sound card as a kind of “time microscope”.

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