Raspberry Pi 4 - remote QRQ CW Keyboard using the AD5DZ recri keyer APPs + ZitaNJbridge

zitaNJbridge provides the near zero latency audio over ip link between the RIG/pi4 interface and the remote OP's desktop https://kokkinizita.linuxaudio.org/linuxaudio/

recri keyer's CW Keyer APPs used from :
https://github.com/recri/keyer


ssh -X used to bring the PI's CW KEYBOARD onto the desktop of the remote OP...(instead of typing on a VNC screen)

the recri keyer APP filters are adjustable to provide bandpass filtering for the RIG RX AUDIO(blocks out the 5555 ptt activation tone)
for the CW TRANSMIT TONE
for the PTT ACTIVATION TONE

the O-SCOPE is the RIG's RF
the SPEC AN is the TRANSMIT CW and PTT activation(the elecraft k3s is the RIG being used and has a brick wall low pass filter that blocks out everything above 4 khz...so none of the 5555 ptt activation tone actually gets transmitted)

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