Chuck aa0hw's Blog (288)

https://kx.studio/News/?action=view&url=cardinal-2206-released

https://github.com/DISTRHO/Cardinal…

when using FLdigi 's serial port KEYING function....it seems to change whatever the CW PITCH was before, and move it up to 1500 hertz... to get it back to a desired PITCH 3 plugins are used to RE-CREATE the FLdigi CW audio note output...

SINE WAVE GENERATOR

ZAMGATE (in sidechain…

CALF STUDIO GEAR

https://calf-studio-gear.org/

ZAMGATE

https://www.zamaudio.com/

setup

FLdigi is keying the PI 4's usb serial port's RTS PINs the RTS pin is…

https://sonobus.net/

the PI2B, still has enough 'power' to function as a REMOTE RIG OPERATIONs interface FLrig(from the pi2b's installed apps) is used to control many functions of the K3S

using ssh -X the PI2b's FLrig GUI appears on the remote laptop's…

GSTREAMER SCRIPT used in this example on the PI 4:

*******************************************************

pi@raspberrypi:~ $ gst-launch-1.0 -v alsasrc device=hw:3 ! "audio/x-raw, layout=(string)interleaved, rate=(int)48000, format=(string)S16LE, channels=(int)2,…

CARLA

https://kx.studio/Applications:Carla

SETUP: A FET H11F1 OPTOisolator is being 'keyed' by the serial RTS PIN from FLdigi's CW KEYBOARD... the output of a 555 square wave oscillator is running continuously and attached to the output pins of…

http://alsamodular.sourceforge.net/

This Gstreamer Script has the internal BandPass Filter used by the PI to take the QRQ CW SQUARE WAVE notes(@84wpm) from a 555 timer chip CPO's audio output, that is being keyed by a CW KEYBOARD, with the 555 output going to the PI's usb mic jack input...this Gstreamer Script filters out all of the harmonics AND puts a raised cosine edge on…

zamgate is a used as a 'GATE', to help balance and equalize the RISE/FALL time of the original CW NOTE passing through it

https://www.zamaudio.com/

a BANDPASS FILTER, finishes the job by cleaning up and reducing the unwanted/unpleasant Morse Code audio…

brief demo of keying a TWIN-T sine wave oscillator and sending the CW AUDIO TONE output from the TWIN-T to the MIC INPUT of an iPHONE LIGHTNING to HEADSET (Mic & Headphone) adapter…

built this TWIN -T - long time ago with the idea to be able to adjust the RISE and Fall TIME individual(via steering diodes) using the 3 variable resistor POTs for pitch, symmetry & rise/fall time circuit also uses a 5V regulator to stabilize the pitch and a 10K output resistor before going to audio input of…

Build your own 'MIDI' "keyable" Morse Code Practice Oscillator

using the free CARDINAL MODULAR SYNTHESIZER

https://kx.studio/News/?action=view&url=cardinal-2202-is-now-released…

Gstreamer Script used in this demo:

gst-launch-1.0 -v audiotestsrc wave=ticks apply-tick-ramp=false tick-interval=100000000 freq=2000 volume=0.5 sine-periods-per-tick=40 ! audioconvert ! autoaudiosink

also being shown in this demo is CW REGENERATION, using ZAMGATE in sidechain…

https://lsp-plug.in/

SIDECHAIN GATE MONO

and

OSCILLATOR MONO

IN sidechain mode, the gate will not let the OSCILLATOR MONO SINE WAVE pass through its upper port

however, when keyed by another CW…

RE: ENB-CW please see this playlist here for more info on this new CW MODE: https://www.youtube.com/playlist?list=PLfFan4sDonOf2O3s6PKh4fnDhEXrRaBut…

GATE plugin used in this demo if from CALF STUDIO PLUGINS

https://calf-studio-gear.org/

The accuracy of having FLdigi key the RIG using its new serial port DTR/RTS keying circuit ...looks impression on first testing...

TESTING  at          120 wpm,  150 wpm and…

pi-apps has a REAPER download REAPER contains all of the plugins to REGENERATE CW

https://pi-apps.io/

throw any kind of sidetone into the REAPER INPUT and REAPER OUTPUTs a pure SINE WAVE, raised cosine edged CW AUDIO TONE, that perfectly clones the exact length of…

TEST SETUP to use SonoBus in a LOOPBACK SERVER MODE (you have to mute all contacts but the PI 4 server) https://sonobus.net/

TO SEND VLF RF CW directly, and send in i/q stereo you need a CW KEYER like Recri Keyer…

QRQ CW TRANSMITTER & RECEIVER are both using HIGH Q resonant systems on their Ferrite Loopstick ANTENNAs

PROBLEM - HIGH Q will cause ringing and MUSH on the RECEIVE signal

SOLUTION - use a GATE between 2 CW AUDIO BANDPASS filters