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

[Chuck Vaughn]

https://youtu.be/T51cr5l-_a0

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...

[aa0hw]

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

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

https://youtu.be/HRhqweSciu0

[Chuck Vaughn]

this CW REGENERATION only takes 4 milliseconds from start to finish

here is a picture showing the TLC555(red) keying the SOFTWARE CW REGEN KEYER(green)

(ON SCOPE each vertical division=5ms)

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[Chuck Vaughn]

just realized i got the colors reversed,  

TLC555=GREEN,  regenCW=RED

[S. Steltzer]

Amazing work Chuck.

[Andrew Moore]

Chuck is always experimenting and building, always learning, always sharing knowledge. I can't even keep up! This is what ham radio is all about.

Many thanks Chuck.

On Sun, Oct 16, 2022 at 6:09 PM S. Steltzer <wf...@fastmail.com> wrote:

Amazing work Chuck.

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[Chuck Vaughn]

tHANKs ! 

[aa0hw]

Here are more video examples of using a TLC555 as a REGEN SOURCE

for Raspberry pi 4 CW KEYER by CW REGENERATION on  a Pi4

AND

a the last 2 are using a simple python script, GPIO created square wave(instead of an external TCL555) from the pi's own gpio pins 

as the REGEN square wave SOURCE... that is keyed by an H11FET optoisolator and fed to the REGEN system's

usb sound card's LINE INPUT for processing and recreating a new CW NOTE(s) to pi4's usb sound card output

https://youtu.be/UafXPV-d8u0

https://youtu.be/kohDcDah7Xk

https://youtu.be/YqrnoIgAi4Q

[Chuck Vaughn]

another test using the python square wave on gpio pin 7 for TRANSMIT to mumble input/sidetone monitor output

and

adding a 2nd regen path for the mumble output...

Mumble input & output CW Regeneration setup running on a Raspberry pi4 for QSO'n CW on iCW LIVE demo

https://youtu.be/WJRGm2iv5Ps

To view this discussion on the web visit https://groups.google.com/d/msgid/i_cw/40fa27b2-43d3-4933-b7c9-1733f14afbfdn%40googlegroups.com.

[Chuck Vaughn]

here is the same setup being used at NEAR ZERO LATENCY 

for iambic paddles & straight key operations

https://youtu.be/kWJHlFCNl1Q

[Chuck Vaughn]

another setup using the pi4's own bcm2835 sound card as a sine/square/triangle wave generator(instead of a TLC555)

https://youtu.be/QzWGFlq0FzE

SETUP: uses an H11F1 FET optoisolator which gets KEYED on its diode side... on the 'N' side of this FET OPTO, a continuous sine wave generated by a Gstreamer Script,

is outputted to the pi4 bcm2835 headhpone jack, which is the source of the CW AUDIO NOTE input for a PI4 CW REGENERATION software chain...

the keyed FET OPTO allows the sine wave from the bcm2835's headphone jack output to pass through the FET OPTO

to another pi sound card Line input, a usb sound card, the Behringer UCA222...the LINE INPUT of

the UCA222 connects to the input of an AUDIO to MIDI app called TRIGGER MIDI MONO(TMM) https://lsp-plug.in/?page=manuals&section=trigger_midi_mono TMM analyzes the start/stop of each CW AUDIO element from the bcm2835 sine wave output(keyed by the FET opto) and outputs a MIDI NOTE(note 0/zero)

and sends it to a midi CW KEYER's midi input port...the output of the CW KEYER is a new AUDIO CW Note

with adjustable rise/fall/pitch/raised cosine/volume the output of the CW KEYER goes to a CW AUDIO BANDPASS FITER

then to a CW LO-MIXER module where the CW PITCH setting of the MIXER tracks perfectly with the CW AUDIO BANDPass settings the CW keyer, filter and mixer are all modules from RECRI KEYER: https://github.com/recri/keyer