All Blog Posts (419)

wireless transmission from the CW KEYER - keying a 555 at 40 Khz - to a wireless LF RF BAND software receiver - demod'N the 40 Khz CW Keyer LF BAND transmitter's CW

the TX and RX antenna are using a high Q , series/parallel resonated FERRITE BOBBIN CORE INDUCTOR COIL - @2mH each - series and parallel resonating capacitors…

22 individual CW software KEYBOARDs are sending a CW text file from 500 hertz up to 11Khz

separated individually by 500 hertz from one signal to another

to pick a CW SPEED/signal that you would like to copy by ear - use your SDR

- here is a quick example of doing that here with a…

60 wpm test - classic R-C exponential envelope VS Raised Cosine - for copying by ear - which do you prefer ?

NOTE: to get the RAISED COSINE edges from YPlog, its RISE/FALL time was set to zero and sent through this simple Gstreamer CW AUDIO BANDPASS filter…

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - RECRI KEYER - https://github.com/recri/keyer using SSH -X on windows to bring up the PI4 CW KEYBOARD on the WINDOWS 10 DESKTOP (uses REALvnc to attach the connections from the CW KEYBOARD MIDI…

https://github.com/duggabe/gr-morse-code-gen

using the PATCH above... the first test of using the GNU RADIO CW KEYBOARD is done at a QRQ CW speed of 99 wpm... and GNU RADIO's modular SETUP for this CW KEYBOARD really did a great job - excellent sounding QRQ CW…

demo of taking the harsh square wave output of any kind of keyed CPO or CW Keyer's audio output - and RE-KEYING it exactly but transforming it to a pure sine wave CW NOTE with Raised Cosine edges (only takes 6 milliseconds from start to finish) uses ZAMGATE in SIDECHAIN MODE which has a pure sine wave TONE GENERATOR connected to Zamgate port…

demo of using the Gstreamer NellyMoser encoder/decoder

for sending Morse Code Audio over ip with Gstreamer scripts

TX

GST_DEBUG=3 gst-launch-1.0 -v jackaudiosrc ! "audio/x-raw,channels=1" ! audioconvert ! avenc_nellymoser ! udpsink host=(ip address of rx)…

brief demo of using a chucK .ck file, "morse.ck" for making a QRQ CW Morse Code Keyboard APP - for sending CW to the Mumble INput on iCW

https://chuck.cs.princeton.edu/release/…

INGEN uses JACK MIDI for its MIDI input(&output) which provides precise timing for the CW elements(NOTE: alsa midi does not provide precise timing as such) This demo uses INGEN which can use all your installed LV2 plugins to create a patch bay array of all kinds of plugins, where, once you are happy with your design, you can save it ALL…

Morse Code Practice when listening to a YouTube CW video (LINUX version) on Linux, using JACK AUDIO CONNECTION KIT, with the Pulse-jack modules, using QUISK SDR to select which CW SPEED from the the multiple CW signals that are playing on the video, which one you would like listen to...etc.. hitting the YOUTUBE SHORTCUTS for REVIEW to repeat…

the Vorbis Codec with RTP PAYLOADING is used in this demo, to send 60 wpm Morse Code audio over the internet using a VPN server that is located several states away....it returns back and goes to a Raspberry PI 4 Receiver which re-directs what it hears back to the recording PC so you can hear what the PI hears...

TRANSMIT…

ehoCW is the CW keyer, since it can use JackRouter as its ASIO DRIVER and work in low latency on windows 10 using the windows version of JACK AUDIO CONNECTION KIT...UltraGrid 1.6, is the AUDIO OVER ip APP, and it has NATIVE JACK AUDIO support so you can hook ehoCW's audio output directly to the input of ULtraGrid and send it out over the…

this is a follow up video to the first here: https://youtu.be/76VrWHyelPs

in this video, we test ffmpeg on WINDOWS 10 and have FLdigi on windows 10 send the whole book of Colossians at 60 wpm to the Linux laptop where the recording is made, and you can see & hear how well it…

1st test converting CW morse code MIDI data to CW OSC data and sending OSC over IP and then converting receive OSC back to CW MIDI back to CW audio https://github.com/ssj71/OSC2MIDI CW MIDI functions from AD5DZ Recri Keyer APPs…

brief demo of using a chucK .ck file for CW Morse Code Keyboard sending

https://chuck.cs.princeton.edu/release/ https://chuck.cs.princeton.edu/doc/build/…

Jacktrip just came out with a new 1.2 version...it has been under heavy development recently... https://groups.google.com/forum/#!topic/jacktrip-users/8XahxQ92_XE…

Brief demo of 4 QRQ CW OPs in conference, full duplex, 2-way, OPUS CODEC, Gstreamer pipelines, using ZEROtier's SDN network ip tables...each OP connecting to the same RASPBERRY PI SERVER and receiving everyone's CW AUDIO a Raspberry PI 4 is setup as a selective forwarding unit(SFU)... so each incoming morse code audio stream goes right back…

testing GOOGLE DUO's ability to send CW over the internet, and finding the best settings to keep GOOGLE DUO from degrading the CW AUDIO TONES from its internal noise filtering, AGC and echo cancellation engines... (to stop Google Duo from doing that, a very tiny volume of low freq sine wave was applied(7.83 hz) and then the CW was also sent…

end a text file from CWop1 over to CWop2, both using Jitsi Meet App for connecting online for a Morse Code audio QSO...turning off WEBCAM to save CPU usage and also using a specialized Jitsi Meet script that preserves the ORIGINAL CW AUDIO :…

sending a TEXT FILE at 60 wpm, from the REMOTE OP's PC, to a RASPBERRY PI 4 that is using the RIG's internal USB SOUND CARD as its own sound card....this test uses an RTSP SERVER:CLIENT audio over ip setup... the CW AUDIO you hear during this test is from the PI 4's TRANSMIT AUDIO MONITOR feed - going back to the REMOTE OP to get the PTT to…