VLF SDR Receiver software that uses the Sound Card - CW DEMO - 24 signals from 500hz to 23500 hz
SDR software = RECRI KEYER SDR MODULES
https://github.com/recri/keyer
SETUP: a pi4 VLF transmitter is sending 24 VLF CW signals from 500hz to 23500 hz [over ip] to a linux laptop's desktop(via TCP/ip Gstreamer SERVER/client pipelines)
(see this video for more info on the Pi4 VLF CW transmitter seutp - • Morse Code Practice by a TCP/iP/Pi4 S... )
Recri Keyer's SDR MODULEs, HiLBERT CeLL, MIXER and FILT demodulate and MIX down the VLF to CW audio
NOTE: some background HF static RX AUDIO, from my RIG on 160 meters, was added to the RECRI SDR MIXER for effect...
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