All Blog Posts (230)

SEND CW to SMART PHONE with wireless router using Raspberry PI, FLdigi, Vban-Emitter & Vban-Receptor


VBAN-EMITTER (Linux/raspberry pi) APP…


Added by Chuck aa0hw on April 24, 2021 at 12:44pm — No Comments

test sending CW over IP with the EAC3 codec at Zero Hertz - demod the RX signal with a soundcard SDR


brief test to see how well the EAC3 CODEC can reconstruct the ON /OFF cw element framework of Morse Code from a CW KEYER sending CW at "0" hz

NOTE: test starts out at QRQ speeds, then CW speed goes down to 20wpm, gradually back up again and over 100 wpm, then back down, to give an idea of how this experimental Morse…


Added by Chuck aa0hw on April 13, 2021 at 12:51pm — No Comments

The Versatility of the AD5DZ CW Keyboard for QRQ CW copy by ear Practice

brief demo of having the AD5DZ CW Keyboard send a text file at 71wpm and then adjusting the KB's many settings to fine tune how the CW sounds for best COPY BY EAR during a QRQ CW training session

Added by Chuck aa0hw on April 13, 2021 at 8:00am — 1 Comment

QRQ CW Keyboard for the iPHONE using an EMF induction coil to iPHONE Microphone interface: LIVE demo

iCW example, to send CW with a QRQ CW Keyboard on the iCW Mumble Server

concept - @8Khz was found to be a peak iPHONE MIC frequency pick-up from the EMF COIL by using an audio oscillator to test which frequency is…


Added by Chuck aa0hw on April 8, 2021 at 11:11am — No Comments

VLF RF over IP IQ CW Transmitter & Receiver: LIVE demo using Gstreamer & the Recri Keyer SDR modules

Gstreamer is for all OS'es MAC, LINUX, WINDOWS 10, Raspberry Pi

Recri Keyer SDR Modules & CW Keyer, CW Keyboard…


Added by Chuck aa0hw on March 29, 2021 at 2:23pm — 1 Comment

Build your own high performance software QRQ CW AUDIO FILTER - using 4 FILTA LV2 modules in series


NOTE:  The delay from start to finish - going through 4 instances of FILTA LV2 cw audio filter modules, being connected in series, measured to be only 2.5…


Added by Chuck aa0hw on February 8, 2021 at 9:00am — No Comments

Raspberry PI remote VLF RF over IP Rcvr::RE-Transmitter - Local PC SDR VLF Receiver - QRQ CW example

experimental setup to QSO QRQ CW at 18Khz VLF RF over ip - using a PEER to PEER Gstreamer PIPELINE TCP/ip setup and a Raspberry PI as a REMOTE VLF RX/ RE-TRANSMITTER

a PI2B is setup to RECEIVE another OP's VLF RF over IP transmission(CW at 18Khz) using a Gstreamer rtp TCP/ip PIPELINE - using the WAVPACK CODEC...the PI2b…


Added by Chuck aa0hw on February 1, 2021 at 11:45am — 1 Comment

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

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