All Blog Posts (249)

How To use CW REGENERATION to get better CW AUDIO TONE quality from echoLINK during ARRL CW PRACTICE

uses a CW REGENERATION method(s)

this example uses the ZamGate 2 channel SIDEchain gate an I/Q sine wave generator is placed on the holding bay ports of ZamGate...

the echolink CW AUDIO output from the ARRL…


Added by Chuck aa0hw on October 27, 2021 at 8:52am — No Comments

for the PYTHON CW OPs out there - to QSO online with each other - here is a homebrew full duplex, Full Mesh Networking setup

modified python script for RECEIVING every connecting CW OP

to the FULL MESH, ZEROTIER, PRIVATE IP network is from:

NOTE: other mods…


Added by Chuck aa0hw on October 16, 2021 at 11:52am — No Comments

Send QRQ CW AUDIO OVER IP with WebCall Audiophile Telephony - WebCall offers free WebRTC telephony

this video is a followup video from the 1st testing of WebCall for Morse Code Audio QSO here -

2nd test of WebCall to see how well this FREE WebRTC service/APP will handle



Added by Chuck aa0hw on October 16, 2021 at 10:17am — No Comments

YPLog QRQ CW Keyboard on Linux(W.I.N.E.) - special method to convert YPLog to Raised Cosine CW edges

PulseAudio is not being used, only the DEFAULT ALSA Sound Card...

the default alsa sound card is an ALSA LOOPBACK VIRTUAL SOUND CARD this Zalsa Command brings the YPLog CW AUDIO into the JACK AUDIO CONNECTION BAY for processing through the alsa loopback virtual cable:

jack_load -w -a zalsa_in -i "-d…


Added by Chuck aa0hw on October 9, 2021 at 8:07pm — No Comments

Experimental iPhone RTSP CLIENT Morse Code Audio over IP Receiver receiving QRQ CW from RTSP SERVER

VLC has an ios version....

an RTSP SERVER was setup on a PC and a Morse Code CW KEYBOARD was sending CW AUDIO into the input of the RTSP SERVER's audio input ports

Added by Chuck aa0hw on October 7, 2021 at 9:19am — No Comments

Linux/Ubuntu DIY adjustable QRQ CW Code Practice Sine Wave Oscillator - keyed using MIDI INPUT

BUILT from scratch using INGEN and a bunch of LV2 plugins:

see previous videos about this topic:

also - for even more…


Added by Chuck aa0hw on October 1, 2021 at 2:00pm — No Comments

QRQ CW Keyboard in a Browser & use this Keyboard to have a QRQ CW QSO over IP with another QRQ CW OP

The transmit & receive OPUS AUDIO over IP PYTHON scripts to QSO CW are modified from the original PYTHON SCRIPTS here:…


Added by Chuck aa0hw on September 6, 2021 at 8:40pm — No Comments

DIY Build your own IAMBIC TOUCH PADDLES CW KEYER using all free software and junk box hardware parts

HARDWARE USED in this example:


2 brass spheres

2 bolts/nuts




small rectangular COPPER PLATE



Added by Chuck aa0hw on September 3, 2021 at 8:48am — No Comments

send CW over ip and send REAL TIME Text Messaging at the same time using Gstreamer scripts

GSTREAMER CW SEND, TEXT SEND, SCRIPT used in this example: ********************************************************************

gst-launch-1.0 -v ximagesrc startx=1200 use-damage=0 ! video/x-raw,framerate=30/1 ! queue ! videoconvert ! queue ! vaapih264enc bitrate=1000 ! queue ! h264parse ! mpegtsmux name=mux ! queue !…


Added by Chuck aa0hw on September 1, 2021 at 8:57pm — No Comments

Stream 2 Morse Code webcams at the same time with 1 Gstreamer Script - show live paddles & st key PLUS the op sending

brief test to stream a USB WEBCAM along with the laptop's native webcam in the laptop lid at the same time over ip to another location

DEMO one webcam showing the MORSE CODE SENDING GEAR (with audio)

DEMO another webcam(laptop's own webcam) showing the person sending the morse…


Added by Chuck aa0hw on September 1, 2021 at 2:00pm — No Comments

QRQ CW @77.5 WPM on the LF band @77.5Khz using a homemade DCF77 Hi-Q Ferrite Bobbin Core RX Antenna

brief demo of QRQ CW on the LF BAND @ 77.5Khz using soundcard SDR modules for both the TRANSMITTER and the RECEIVER from RECRI KEYER

FERRITE BOBBIN CORE HI-Q antenna 1.8mH, with about .002uF cap across the 2 ends of the core winding -…


Added by Chuck aa0hw on August 31, 2021 at 3:21pm — No Comments

iPHONE QRQ CW Receiver - over The 5G Network - listening to a QRQ CW signal on the iCW Mumble Server

follow up from the previous video where the iphone is sending cw...

this time, the iPHONE is receiving CW over its own MUMBLE VOICE CHAT iphone APP - but instead of using wifi, the iphone is using The 5G NETWORK...

to test and see how well you can send and receive…


Added by Chuck aa0hw on July 27, 2021 at 10:50am — No Comments

Near Zero Latency Performance for the HASAK CW KEYER/CW KEYBOARD

testing the HASAK CW KEYER for low latency performance running JACK AUDIO CONNECTION KIT at  48K sample rate at 2 periods of 144 buffer frames

the CW KEYER from the time you hit the paddle until you hear the sidetone, while listening to the HASAK USB SOUND CARD inside JACK CONNECTION BAY

          is only 8…


Added by Chuck aa0hw on July 21, 2021 at 9:02am — No Comments

if you use a PC for QRQ CW operations with your RIG, please show us the desktop APPs you are using...

Here is mine:   (from this morning's QSO with  w4dbv)

the SPEC GRAPH and SCOPE are showing Brian's signals on my k3s receiver 

the FLrig APP controls the rig from my remote position in the living room...…


Added by Chuck aa0hw on July 21, 2021 at 8:16am — No Comments

Hasak CW Keyer: using a QRQ CW Keyboard APP with an audio derived keying circuit that keys the Hasak

test to see how well an audio derived cw keying circuit, like one of these:

can "key" the HASAK CW KEYER's straight key pins...and allow a software CW KEYBOARD…


Added by Chuck aa0hw on July 20, 2021 at 8:43pm — No Comments

Python script to see & hear(or Record) a USB WEBCAM VIDEO & MIC of your CW Keyer's paddles & straight key in action

cool python script i just found for to activate a usb webcam for LIVE VIDEO & LIVE webcam mic AUDIO

Script modified from here:



Added by Chuck aa0hw on July 19, 2021 at 10:51am — No Comments

Submarine 82hz ELF soundcard SDR, QRQ CW, QRP, Transmitter & Receiver - test run at 82 wpm


CW KEYBOARD sends 82 hertz CW out one of the sound card's line output jacks to a class D 30 watt audio amp... the audio amp output is connected to a FERRITE BOBBIN CORE INDUCTOR COIL (@ 1.8mH) - the output of the 30W audio amp 1st goes to a POWER TOROID TRANSFORMER with multiple windings and tested to…


Added by Chuck aa0hw on July 2, 2021 at 11:02am — No Comments

homebrew QRQ CW 7 Transistor TRF Receiver receiving an AM CW Signal on the LF band at 75Khz @75 wpm

75Khz soundcard SDR QRQ CW TRANSMITTER is built from the RECRI KEYER CW Keyboard - (the AD5DZ CW Keyboard can send directly at 75Khz if your sound card sample rate is set to at least 192Khz)

- CW KBD terminal…


Added by Chuck aa0hw on June 7, 2021 at 1:20pm — No Comments

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

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