Скачать или смотреть Ham Radio - no antenna ? RIG not working ? you can still send & receive RF with RF over IP - LF band

experimental setup to test sending and receiving RF over IP on the LF BAND - using 3 individual channels of RF - Channel 1. for voice at 48Khz Channel 2. for CW at 70Khz Channel 3. for digital modes, bpsk125 - text messaging at 92Khz
(PI 4 TRANSMITTER - LUBUNTU 18.04 Laptop receiver)

the AD5DZ RECRI KEYER SDR APPS are used to DSB MODULATE and DEMODULATE each audio source to their respective LF BAND FREQUENCY and on RX back to their original audio pitches
https://github.com/recri/keyer

(with both sound cards of TX & RX PC, set to sample rate of 192Khz)

transmit 3 channels of VORBIS encoded RF - PI 4 transmitter script:
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pi@raspberrypi:~ $ gst-launch-1.0 -v jackaudiosrc ! "audio/x-raw, channels=3" ! audioconvert ! vorbisenc quality=1 ! rtpvorbispay ! udpsink host=192.168.1.101 port=7890

receive 3 channel VORBIS encoded RF on the laptop:
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gst-launch-1.0 -v udpsrc port=7890 do-timestamp=true ! "application/x-rtp, media=(string)audio, clock-rate=(int)192000, encoding-name=(string)VORBIS, encoding-params=(string)3, configuration=(string)(get from transmit caps...too long to include in description) , payload=(int)96" ! rtpjitterbuffer latency=30 ! rtpvorbisdepay ! vorbisdec ! audioconvert ! jackaudiosink sync=false async=false buffer-time=5000