All Blog Posts Tagged 'QRQcw' (144)

TEST SETUP to use SonoBus in a LOOPBACK SERVER MODE (you have to mute all contacts but the PI 4 server) https://sonobus.net/

TO SEND VLF RF CW directly, and send in i/q stereo you need a CW KEYER like Recri Keyer…

https://lsp-plug.in/?page=manuals&section=trigger_midi_mono

https://github.com/recri/keyer

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

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…

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"…

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…

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…

ZAMGATE PLUGIN INFO HERE:

http://www.zamaudio.com/?p=976

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...

GO FROM THIS:…

see previous video for this telecoil transmitter for more info in the 1st video description notes https://youtu.be/L1OmVx4mxU8

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

https://github.com/billythehippo/vban-1 (this open source VBAN project has Jack Audio Connection Kit support)

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…

modified python script for RECEIVING every connecting CW OP

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

https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html

NOTE: other mods…

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

https://youtu.be/1h8v865N7IE

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

QRQ CW MORSE CODE AUDIO…

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…

https://keyer.elf.org/

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

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...…

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

https://qrqcwnet.ning.com/forum/topics/what-circuit-for-computer

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

TRANSMITTER SETUP:

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…

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

- CW KBD terminal…

Rohde's AM Detector circuit from:

http://www.pan-tex.net/usr/r/receivers/elrpicamdetect.htm soundcard

SDR TRANSMITTER from:…