All Blog Posts (232)

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

QRQ CW "audio over ip" Morse Code Net server using ZeroTier SDN, Gstreamer & a Raspberry PI - LIVE demo with 4 OPs

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…


Added by Chuck aa0hw on August 1, 2020 at 8:48am — No Comments

QRQ CW over Google DUO - LIVE demo - 60 wpm QRQcw Keyboard + paddles & Straight Key

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…


Added by Chuck aa0hw on July 5, 2020 at 7:51am — No Comments

QRQcw send/receive over ip test using the Jitsi Meet WebRTC App

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 :…


Added by Chuck aa0hw on June 26, 2020 at 9:37am — No Comments

Raspberry PI 4 as a remote RIG over ip AFCW mode CW RIG keying interface - network stability test

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…


Added by Chuck aa0hw on June 3, 2020 at 8:33am — No Comments

Raspberry Pi 4 - remote QRQ CW Keyboard using the AD5DZ recri keyer APPs + ZitaNJbridge

zitaNJbridge provides the near zero latency audio over ip link between the RIG/pi4 interface and the remote OP's desktop

recri keyer's CW Keyer APPs used from :…


Added by Chuck aa0hw on May 31, 2020 at 2:04pm — No Comments

Using the LOXJIE A10 60 Watt Class-D Audio Amplifier as an 88Khz LF Band QRQ CW Transmitter AMP

this is a follow video to this one in this series: PC's native MOBO sound card was set to 192Khz to enable direct 88Khz CW TRANSMIT from the AD5DZ CW KEYBOARD sending a text file

the LF RF 88Khz output of the PC's sound card goes to the input of the LOXJIE A10…


Added by Chuck aa0hw on May 22, 2020 at 1:43pm — No Comments

QRQ CW test - send CW at 96 Khz on the LF band at 96 wpm and send it to another OP over IP

brief experiment to see if by using the maximum sample rate of a sound card, 192Khz, would allow sending QRQ CW at 96 Khz(the highest frequency possible at 192Khz sample rate) at 96 wpm

Gstreamer scripts are used by the TRANSMITTER and RECEIVER

- TCP CW LF RF over IP -



gst-launch-1.0 -v…


Added by Chuck aa0hw on May 17, 2020 at 6:58am — No Comments

QRQ CW OPs - minimize CW ELEMENT spectrum splatter when transmitting QRQ CW on your RIG - with this:

1. send AFCW MODE

2. use this GSTREAMER BANDPASS FILTER between your CW KEYER's audio output and the RIG's LINE INPUT


gst-launch-1.0 jackaudiosrc ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=600 upper-frequency=800 length=700…


Added by Chuck aa0hw on May 16, 2020 at 7:43am — No Comments

experimental QRQ CW TRANSMIT FILTER to achieve a very narrow RF bandwidth on QRQ CW TRANSMIT - VLF BAND TEST

VLF BAND TEST on 10101 Hz

20 watt VLF AMP to compact DELTA LOOP ANTENNA

received by a Ferrite rod RX VLF antenna connected directly to this recording laptop's MIC INPUT jack, demodulated from VLF into CW AUDIO by the AD5DZ SDR APPs: LO-MIXER & FILTER modules



Added by Chuck aa0hw on May 9, 2020 at 4:40pm — No Comments

The AD5DZ MODULAR SDR software - demo of the AD5DZ SDR modules used to receive a VLF band QRQ CW signal

using all AD5DZ SDR software MODULES to capture & demodulate a QRQ CW signal heard on the VLF BAND at 10101 Hz...this video also shows one special adjustment made to a RECRI KEYER FILTER file setting to create a custom CW AUDIO BANDPASS FILTER for QRQ CW RX copy

a VLF RX ANTENNA - tuned bi-coil ferrite rod - brings in the VLF SIGNAL…


Added by Chuck aa0hw on May 3, 2020 at 2:30pm — No Comments

QRQ CW @ 120 wpm on the VLF BAND - RX on QUISK SDR + 2 Gstreamer Bandpass Filters to help

brief demo of picking up a QRQ CW signal on the VLF BAND @ 12 Khz, using this VLF RX - bi-coil Ferrite Mass Antenna(FMA) -

in this demo, 2 specialized Gstreamer bandpass scripts are used:

1. one to match the VLF BANDWIDTH of QUISK SDR

2. another one to filter…


Added by Chuck aa0hw on April 26, 2020 at 8:53am — No Comments

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