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Just connect an antenna to your computer's microphone input, and you can receive VLF (Very Low Frequency) radio signals! A sound card (or built-in sound chip) with a recording sampling rate of at least 96 kHz is recommended.
Example of using this method to receive VLF signals from Russia and Europe:
• Excellent VLF receivin...
SDR Sharp software (for Windows) to receive and record VLF (and many other) radio signals:
sdrsharp.com/#d...
Similar SDR (Software Defined Radio) applications are available for Linux and Mac OS.
Lists of VLF stations:
sidstation.loud...
www.smeter.net/...
Common sources of radio interference and recommended solutions:
www.ccrane.com/...
About the accidental recording of VLF station GBR (16 kHz) contained on Mike Oldfield's "Tubular Bells" album:
alancordwell.co...
gkircher.storml...
en.wikipedia.or...