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Has anyone ever built and operated a VLF receiver? The idea has always fascinated me. Can you offer any construction ideas or design tips? Can you describe what you heard? Can you direct me to any schematics or articles on the internet?
Thanks!
Most common use I know of for VLF is underwater comms for subs. They usually drag about a mile of wire behind the boat... Word of caution, if you do build one, don't use a switcher supply or you will get birdies at the switch frequency and all its harmonics.
The minuteman missile base I served in had a VLF command communications system in the underground launch control facilities as well (they had HF and local UHF as well). Something about the ionized atmosphere after possible overhead nuclear explosions left VLF as the only reliable RF communications channel available to send launch control permissions
Lefty