Chuck aa0hw's Blog (358)

QRQ CW 'copy by ear' PRACTICE via an online RADIO STATION(mp3) and via iCW MUMBLE(OPUS) - LIVE DEMO

brief testing and comparing MP3 to OPUS from a CASTER.FM free online Radio Station setup and the iCW MUMBLE Server/client setup

a Raspberry Pi 4 is doing the transmitting to both MUMBLE INPUT and the RADIO STATION INPUT

unixCW is providing the APP to send repeating text files at different speeds and at…


Added by Chuck aa0hw on January 26, 2023 at 1:58pm — No Comments

Christian CW OPs: use your QRQ skills for STEALTH communication with other Christian CWops in countries where Christians are persecuted

This method uses 3Khz VLF RF CW over ip that is encrypted & stealth modulated

using MicroModulation methods to encode stealth, LiVE text messaging data onto an a VLF 3kHZ AM CARRIER wave .. can't see anything, or hear anything - sounds and looks like a 'dead' carrier wave with nothing on it...

METHODS the secret…


Added by Chuck aa0hw on January 18, 2023 at 1:55pm — No Comments

SonoBus + SMART PHONE - as a Morse Code, CW 'copy by ear' PRACTICE, 'audio over ip/WiFi' Receiver

demo of using an iphone as a QRQ CW SonoBus Receiver - to choose & listen to multiple CW TEXT files(up to 18 different text files) being sent by unixCW's CW program from a pi4 'audio over WiFi' Transmitter NOTE: SonoBus, in MULTI-CHANNEL input mode, can send 18 different, individual audio sources at the same time, and the iphone sonobus…


Added by Chuck aa0hw on January 16, 2023 at 10:16am — No Comments

QRQ CW Morse Code RADIO - Python Radio Receiver - CW 'copy by ear' practice from 20 - 100 wpm

Python QRQ CW Radio Station Receiver - modified from this python script:

sending CW text files on continuous repeat using unixCW's CW program…


Added by Chuck aa0hw on January 14, 2023 at 9:43am — No Comments

QRQ CW - AM Modulated @64Khz - demod by Rohde's Detector circuit, filter output through W3NQN filter

custom w3nqn QRQ CW filter

Rohde's AM Detector Circuit…


Added by Chuck aa0hw on January 5, 2023 at 1:29pm — No Comments

Raspberry Pi4 QRQ CW text file sending using unixCW's CW program set for continuous repeat - LIVE demo @ 73wpm

TERMINAL COMMAND for sending a CW TEXT file with UNiXCW/cw program (continuous REPEAT)

while true; do (./cw -d hw:0,1,0 -f ur.txt -w 73 -k 48 -t 852 -v 100); sleep 1; done

for unixcw's CW audio output - this script uses the alsa loopback snd-aloop cable(hw:0,1,0) to receive it uses alsa_in -d hw:0,0,0…


Added by Chuck aa0hw on January 2, 2023 at 11:20am — 2 Comments

LYsdr - a GREAT Linux soundcard SDR to use for HAM RADIO - LIVE DEMO using VOICE, CW, and DOMINOex22 demo of using LYSDR to demod 3 VLF frequencies at the same time using multiple instances of LYSDR and combing their demod'D audio outputs…


Added by Chuck aa0hw on December 26, 2022 at 11:13am — No Comments

QRQ CW Practice using QUiSK SDR, unixCW text file sender, Gstreamer CW Router & RECRI CW Regenerator

QUiSK SDR with the help of unixCW, gSTREAMER & RECRI KEYER allows a unique way to practice your CW copy by EAR

SETUP: unixCW's CW program is sending the same text file at speeds below & just above, say...a current comfortable CW copy by ear speed... pick a text file and speed that is no longer than 10 to 15 minutes…


Added by Chuck aa0hw on December 25, 2022 at 10:26am — No Comments

FLdigi over iP - LiVE demo sending FLdigi Morse Code Audio between 2 CWops over the internet

uses FLdigi, Gstreamer and VIRTUAL AUDIO CABLEs the virtual audio cables take the CW AUDIO OUTPUT from FLdigi and send it to the OP's soundcard(for CW sidetone monitoring @ low latency) AND sends it over iP to the other CW OP(can use any audio codec via Gstreamer)

one Gstreamer SCRIPT does it all - grabs FLdigi's…


Added by Chuck aa0hw on December 24, 2022 at 1:39pm — No Comments

Build ur own Ham Radio Virtual ionosphere with Pi4, gstreamer, QUiSK SDR, 192kHZ sample rate sndCARD

demo of setting up a pi4 to act as an RTSP virtual ham radio ionosphere SERVER that many OPs can connect to for QSO'n or just listening... this setup uses an i/q input above and below ZERO POINT by about 80 Khz worth of RF SPECTRUM - to gather together and QSO uses the gSTREAMER wavpack codec, and a gstreamer…


Added by Chuck aa0hw on December 17, 2022 at 2:09pm — 1 Comment

QRQ CW iphone receiver over SONOBUS via pi4 QUISK SDR/realvnc using 8 VLF signals & 8 CW text files

demo showing unixcw/CW sending 8 different CW Text files at 60 wpm to a pi4 QUISK SDR, using sonobus on the pi4 to send QUISK SDR demodulated output to the iphone sonobus// iphone using REALvnc to choose which pi4 QUISK SDR VLF SIGNAL to demod and listen to



Added by Chuck aa0hw on December 17, 2022 at 10:10am — No Comments

sound card SDR Receiver, VLF band, downconverter / software MIXER - LIVE DEMO with 5 VLF CW signals

brief demo using the sound card SDR modules from RECRI KEYER to downconvert 5 VLF CW signals from 16Khz to 20Khz converted/mixed down to CW audio at 700 hertz

Added by Chuck aa0hw on December 15, 2022 at 9:30am — No Comments

QSO CW over VLF by Gstreamer, a Raspberry PI remote VLF Transmitter & RX laptop with Ferrite antenna

brief demo showing the REMOTE Pi4 VLF TRANSMITTER setup and a laptop soundcard SDR receiver using its own FERRITE LOOPSTICK ANTENNA to pick up the VLF signal from the remote PI's transmitter's loop antenna located in the other room

soundcard SDR modules are from RECRI KEYER…


Added by Chuck aa0hw on December 12, 2022 at 1:45pm — No Comments

QRQ CW Receive using a HIGH Q FILTER - too much ringing? elongated CW elements? - try using a DE-Qer

demo uses TRIGGER MIDI MONO as a DE-Qer

TRIGGER MIDI MONO analyzes the input volume peaks of the HIGH Q CW elements then sends out a MIDI NOTE on/off message to a software midi input CW KEYER app like RECRI KEYER - (or…


Added by Chuck aa0hw on November 18, 2022 at 9:56am — No Comments

3CX for Morse Code OPs to qso over WEBrtc for FREE - up to 25 participants





Easy. No downloads or accounts Simple to create, host and join a meeting. Attendees join from their browser. No app required. We never ask your attendees to create an account or give out details.…


Added by Chuck aa0hw on November 16, 2022 at 8:27am — No Comments

CW Transmitter - save even MORE battery power using Pulse Width Modulated CW: LIVE demo of the setup

instead of sending a solid keydown of dits & dahs... when you key down using this method, only the smallest possible pulse width of the minimalist pulses per CW ELEMENT train, at the CW RF frequency of interest, is sent... saving battery power since the PWM key down is a tiny percentage of battery current/power being used when compared to…


Added by Chuck aa0hw on November 15, 2022 at 9:37am — 2 Comments

QRQ CW ULF band "high Q" antenna Transmitter & Receiver: test a DE-Q'r APP to get rid of the ringing

THE zamgate PLUGIN, in sidechain mode, does the DE-Q'n

ZAMGATE analyzes/measures the incoming high q wavefront of the QRQ CW and regenerates a NEW QRQ CW Note with adjustable weight and rise/fall times

Added by Chuck aa0hw on November 13, 2022 at 6:48pm — No Comments

Tuned Bipoloar Tesla Coil with FERRITE CORE for a QRQ CW 16Khz VLF Band Transmit Antenna - LIVE DEMO

The tuning of the biploar tesla coil for 16Khz is quite sharp but dramatically increases the transmitter signal antenna output - the RX ferrite antenna is also tuned by a parallel cap (TRANSMITTER is a Linux laptop, RECEIVER Is a pi4) both antennas are using SOUND CARD SDR software modules from RECRI KEYER... to be able to send and receive at…


Added by Chuck aa0hw on November 11, 2022 at 11:30am — No Comments

16.6kHZ tuned Ferrite Rods TRANSMIT ANTENNA array for sending QRQ CW on the VLF BAND - LIVE demo

qrq cw from a CW KEYBOARD by RECRI KEYER on a RASPBERRY PI 4 to a Behringer UCA222 to a CLASS D AMP to the FERRITE RODs ANTENNA ARRAY

Added by Chuck aa0hw on November 9, 2022 at 3:51pm — No Comments

using very HIGH Q CW audio bandpass filters to help extract QRQ CW from a VLF 8Khz ENB-CW TX signal

the high Q of 2 dsp CW AUDIO BANDPASS filter in series helps greatly to extract the ENB-CW modulated 8Khz carrier VLF Transmitter's signal

high Q CW BANDPASS filters otherwise would cause terrible ringing for CW; however, in this case... it actually helps

for more info on ENB-CW please see the playlist…


Added by Chuck aa0hw on November 9, 2022 at 8:28am — No Comments

Monthly Archives

















© 2023   Created by Chuck aa0hw.   Powered by

Badges  |  Report an Issue  |  Terms of Service