Chuck aa0hw's Blog (227)

sending QRQ CW over IP over MIDI using ASEQNET TCP/IP - 80 wpm test - Linux Laptop to a Raspberry PI

test to see how stable the CW TIMING is at QRQ CW speed * 80 wpm * when using ASEQNET server/CLIENT setup midi over tcp/ip

a MIDI CW KEYBOARD is used as the CW MIDI…


Added by Chuck aa0hw on January 30, 2021 at 3:19pm — No Comments

ULF BAND Receive Ferrite Core Loopstick Antenna for SOUND CARD INPUT - LIVE DEMO with QRQ CW example

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…


Added by Chuck aa0hw on January 25, 2021 at 12:46pm — No Comments

Tuned Ferrite Rod Loopstick ULF BAND(797hz) RX antenna to MIC JACK soundcard input: LIVE demo QRQ CW

this is a follow up from the first video here -

in this video....QRQ CW is being transmitted out on the ULF band at 797 hz and at 75 wpm to a small horizontal wire loop antenna @ about 30 watts from an audio amp/4 to 1…


Added by Chuck aa0hw on January 5, 2021 at 12:00pm — No Comments

new QRQ CW KEYBOARD - In your Browser - plus, IAMBIC PADDLES & Straight Key

go to

Added by Chuck aa0hw on November 30, 2020 at 10:08am — No Comments

Wireless CW Keyer - 40 khz LF Band TX/RX - using 2 High Q Ferrite Bobbin Core Inductor Coil Antennas

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…


Added by Chuck aa0hw on November 24, 2020 at 3:58pm — 1 Comment

CW Copy By Ear Practice - 22 separate signals from 20 wpm to 90 wpm - use your SDR APP to pick which one

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…


Added by Chuck aa0hw on November 20, 2020 at 3:19pm — 2 Comments

classic R-C exponential envelope VS Raised Cosine for QRQ CW - Listen and Vote - which do you prefer

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…


Added by Chuck aa0hw on November 18, 2020 at 11:00am — No Comments

Send QRQ CW using a LINUX CW KEYBOARD that appears on your WINDOWS 10 PC in Real Time at Near Zero Latency

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - 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…


Added by Chuck aa0hw on November 1, 2020 at 5:30pm — No Comments

The GNU RADIO CW Keyboard - sending QRQ CW at 99 wpm test

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…


Added by Chuck aa0hw on October 14, 2020 at 10:42am — 2 Comments

The QRQ CW RE-Keyer System - a harsh square wave IN - pure sine wave OUT - with Raised Cosine edges

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…


Added by Chuck aa0hw on October 4, 2020 at 8:00pm — 8 Comments

QRQ CW over ip using Nelly Moser Audio Codec - real-time, low bitrate, low latency encoding/decoding

demo of using the Gstreamer NellyMoser encoder/decoder

for sending Morse Code Audio over ip with Gstreamer scripts


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


Added by Chuck aa0hw on September 22, 2020 at 3:00pm — No Comments

QRQ CW Keyboard for Windows 10 - using the Music Language "ChucK" - demo sending CW to Mumble INPUT

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


Added by Chuck aa0hw on September 12, 2020 at 11:24am — No Comments

build your own MIDI KEYED, Customizable, QRQ CW SINE OSCILLATOR LV2 Plugin, with the Linux APP INGEN

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…


Added by Chuck aa0hw on September 5, 2020 at 8:51am — No Comments

Morse Code Copy by Ear Practice from YouTube CW videos - use QUISK SDR, Gate & BP filter - LIVE demo

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…


Added by Chuck aa0hw on September 2, 2020 at 12:00pm — No Comments

send QRQ CW Morse Code Audio over the internet using the Vorbis Audio codec with RTP payloading

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 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...



Added by Chuck aa0hw on August 31, 2020 at 3:49pm — No Comments

send Morse Code Audio over IP on Windows 10 using UltraGrid, Jackrouter & ehoCW

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…


Added by Chuck aa0hw on August 27, 2020 at 10:53am — No Comments

send Morse Code QRQ CW Audio over IP on Windows 10 using FFMPEG & OPUS CODEC - LIVE demo @ 60 wpm

this is a follow up video to the first here:

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…


Added by Chuck aa0hw on August 25, 2020 at 2:30pm — No Comments

OSC2MIDI demo - QRQ CW test - CW Midi to OSC - OSC over ip - OSC to MIDI CW - CW Midi to CW audio

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 CW MIDI functions from AD5DZ Recri Keyer APPs…


Added by Chuck aa0hw on August 24, 2020 at 10:33am — No Comments

REMOTE RIG audio over ip test using the latest version of Jacktrip(1.2) - QRQ CW QSK test at 60 wpm

Jacktrip just came out with a new 1.2 has been under heavy development recently...!topic/jacktrip-users/8XahxQ92_XE…


Added by Chuck aa0hw on August 8, 2020 at 4:27pm — No Comments

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