full duplex DUAL BAND{ULF & VLF} BPSK63F text messaging: for Cave to Surface Through the Earth COMMs

Published: 10 March 2023
on channel: QRQcw

brief demo showing a setup that uses TWO separate TUNED high "Q" ferrite core COIL antennas at TWO DiFFERENT FREQUENCiES on two different bands ULF and VLF
one antenna for TRANSMIT the other for RECEIVE
to keep the TRANSMIT antenna SIGNAL from swamping out the RECEIVE SiGNAL on the RECEiVE usb sound card's line input, an LC series resonant circuit 'grounds out' the TRANSMiT signal frequency at the USB sound card's LINE INPUT(RX)

http://ac4m.us/psk63F.html
http://f1ult.free.fr/DIGIMODES/MULTIP...
http://ac4m.us/psk63f.html
http://www.w1hkj.com/modes/psk.htm

for more examples of 'Through The Earth' Comms setups like these...
see the playlist here:
• DiY 'Through the Earth' Transmitter ...

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