pi4 DiY 'Through the Earth' CAVE RADIO VLF Transmitter - 2 VOICE channels & 1 Data channel for text
3 people can operate this pi4 VLF 12Khz transmitter at the same time...
voice @ 11Khz LSB, voice @ 13Khz USB, and, 12Khz BPSK31(text)
TX/RX software SDR modules to modulate/demodulate the LSB/USB at VLF
are from RECRI KEYER - https://github.com/recri/keyer
for more examples of 'Through The Earth' Comms setups like these...
see the playlist here:
• DiY 'Through the Earth' Transmitter ...
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