High Performance Raspberry Pi4 CW CPO/CW Keyer(CW RE-generator) using KXstudio CARLA APP - LIVE demo

[Chuck aa0hw]

CARLA on this raspberry pi 4 is using the ALSA AUDIO ENGINE, with a USB SOUND CARD(Behringer UCA222) 48Khz sample rate, 3 periods of 64 buffer frames - for lowest possible latency for this operation https://kx.studio/Applications:Carla

CARLA is using 1 lv2 plugin TRIGGER MIDI MONO to capture the incoming TLC555's 'keyed' audio output and RE-CONVERTs it to a CW midi output signal that keys an adjustable software CW KEYER from RECRI KEYER

https://lsp-plug.in/?page=manuals&section=trigger_midi_mono

https://github.com/recri/keyer

SETUP:

TRIGGER MIDI MONO clones the CW NOTE length that is at its input from the externally keyed TLC555 that connects the 555 cw audio output to the pi usb sound card input TRIGGER MIDI MONO converts this AUDIO to MIDI NOTE on/off data & sends this CW MiDi output( CW keying data) to the CW MiDi input of the software CW CPO from RECRI KEYER(keyer-tone) which can be adjusted for many cw parameters - rise/fall time/raised cosine window etc/// the CW CPO output is at 10Khz, which then goes to a RECRI CW bandpass FILTER that adjusts how HARD or SOFT you want the keying to be...then the output of the FILTER goes to the input of the LO MIXER which adjusts the final CW FREQUENCY/pitch NOTE - the MIXER and FILTER track together ...the PITCH SELECTION on the MIXER is always centered perfectly with the bandwidth/"Q"(length) settings on the FILTER CARLA - has an ADD JACK APPLICATION function where all 3 of the RECRI APPs are added to the connection bay.... then you can save not only the settings on TRIGGER MIDI MONO(lv2 plugin) but also save all the settings on all 3 RECRI APPs KEYER-TONE, FILTER and MIXER and bring them all back up just the way they were when you save them... then next time you want to use this setup....etc...

[Chuck aa0hw]

High Performance Raspberry Pi4 CW CPO/CW Keyer(CW RE-generator) using KXstudio CATIA APP - LIVE demo

~same setup as the previous video except for using JACK instead of ALSA this time and using CATIA instead of CARLA

KXSTUDIO CATIA

https://kx.studio/Applications:Catia

TRIGGER MIDI MONO & RECRI KEYER

https://lsp-plug.in/?page=manuals&section=trigger_midi_mono https://github.com/recri/keye

[Chuck aa0hw]

Asymmetrical Exponential shaped CW at QRQ(60 wpm) \\Raspberry Pi4// CW Keyer - LIVE demo

Raspberry pi4 CW KEYER apps create the Asymmetrical Exponential shaped CW NOTEs see these 2 video demos for more info on how the PI operates as a CW (RE)KEYER (REgenerator)

https://youtu.be/HRhqweSciu0

https://youtu.be/T51cr5l-_a0