All Blog Posts Tagged 'QRQcw' (103)

Raspberry PI 4 complete CW KEYER(iambics, st key & keyboard) using free software from LSP & Recri

CW KEYER SETUP overview: 4 different 555 timer chip oscillators that have been set to…


Added by Chuck aa0hw on May 10, 2022 at 10:47am — No Comments

QRQ CW PRACTICE using an iphone - uses realVNC, Raspberry PI4, Mixxx & SonoBus 'audio over ip' APP

Mixxx allows you to go back a word or two(or more) to play again, a word or phrase that you may not have copied fully Mixxx also allows you to adjust the SPEED of the QRQ CW COPY PRACTICE session - 'on the fly'

NOTE: to keep the pitch the same, no matter the MIXXX variable speed setting, ZAMGATE and a pure sine wave…


Added by Chuck aa0hw on January 26, 2022 at 11:27am — No Comments

encoding & encrypting text message QRQ CW Morse Code KEYING DATA onto & into a 60 hertz audio signal

the encoded QRQ CW DATA is inaudible & virtually undetectable all you hear is a low volume 60 hertz signal, until the ZAMGATE DECODER is used to extract & produce actual CW NOTEs from the embedded CW KEYING DATA attached to the 60 cycle hum signal stream..... this encoding/decoding method can be used LIVE or implanted in a "safe"…


Added by Chuck aa0hw on January 5, 2022 at 8:15am — No Comments

THE MATRIX - Morse Code Version - 10 CW signals in one DATA STREAM - LIVE demo using LYSDR to decode

Experimental CW MODE - embedding CW ELEMENTs onto a VLF CARRIER by increasing the volume slightly of the VLF CARRIER per each CW ELEMENT, the process includes 5ms Rise/Fall times of the VLF CARRIER EMBED Process(uses ZamGate in sidechain mode)

a MORSE CODE keyer / keyboard APP sends its output to the TRIGGER PORT of a…


Added by Chuck aa0hw on January 4, 2022 at 3:34pm — No Comments

Receiving QRQ CW over the SLF BAND: LIVE demo: 50 hertz CW sent at 50 wpm: RX converts 50hz to 780hz

SETUP an SLF CW TRANSMITTER is sending at 50 wpm using 50 hertz SLF RF going to a FERRITE ROD SLF CW TRANSMIT ANTENNA - powered by a cheap class D 30 watt audio amp with the FERRITE SLF CW TRANSMIT ANTENNA hooked up to the CLASS D audio amp's output

Another FERRITE ROD SLF CW RECEIVE ANTENNA is hooked up to the…


Added by Chuck aa0hw on January 2, 2022 at 10:50am — No Comments

passive QRQ CW AUDIO BANDPass filter using 3 series/parallel tuned Ferrite Rod Loopstick Antenna stages

SQUARE WAVE to SINE WAVE by a 3 stage CW AUDIO BANDPASS FILTER setup using 3 sets of tuned ferrite rods,  tuned similar in the way that an antique crystal wireless set would be tuned at the antenna stage, the passive bandpass filter middle stage, and the 3rd filter going to the 1st stage of detection...



Added by Chuck aa0hw on December 24, 2021 at 9:53am — No Comments

QRQ CW OPs - copy QRQ CW using your hearing aid telecoils & this DIY Telecoil CW AUDIO transmitter

see previous video for this telecoil transmitter for more info in the 1st video description notes

uses 2 ferrite bobbin core inductor [telecoil transmitter] coils... something like one of these from:…


Added by Chuck aa0hw on December 20, 2021 at 12:07pm — No Comments

VBAN_EMITTER now has jack support - Morse Code QRQ CW example - CW to an iPhone using VBAN receptor (this open source VBAN project has Jack Audio Connection Kit support)

Added by Chuck aa0hw on December 15, 2021 at 11:51am — No Comments

Raspberry Pi 4 - remote VLF RF QRQ CW Transmitter - LIVE Demo using the Ultragrid VLF RF over IP APP

BRIEF demo of someone sending 14.4Khz QRQ CW VLF RF over IP to a Remote RASPBERRY PI 4 and the Pi-4 RE-Transmits the incoming signal over to an indoor VLF Transmit antenna... a local VLF soundcard SDR Receiver Antenna picks up the signal from the PI 4 RE-Transmitter and mixes the 14.4Khz down to 780 hz QRQ CW Morse Code audio tones…


Added by Chuck aa0hw on December 15, 2021 at 10:48am — 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

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

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

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

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

Monthly Archives
















© 2022   Created by Chuck aa0hw.   Powered by

Badges  |  Report an Issue  |  Terms of Service