All Blog Posts Tagged 'cw' (33)

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

QRQ CW over SONOBUS using CARLA in MULTI-CLIENT Mode: key a 555, regen & filter for SonoBus sidetone

Brief Demo for sending QRQ CW over SONOBUS using KXstudio's Carla in "multiple clients" mode on a Raspberry Pi 4 SonoBus is also monitoring its input to be able to monitor the REGEN'd ZamGate CW sidetone in real time at near zero latency

a TLC555 is being keyed by FLdigi's serial port rts pin, TLC555 sending its audio…


Added by Chuck aa0hw on August 17, 2022 at 10:52am — 1 Comment

Morse Code Audio over Mumble: alsa-loopback to interject a CW AUDIO bandpass filter for mumble input


alsa-loopback cable

virtual audio cable

via a Gstreamer TEE SCRIPT to take a keyed oscillator at the mumble sound card input... filter it 1st... and then send it to two places...

1. the mumble USB sound card's output so you can monitor your own…


Added by Chuck aa0hw on August 2, 2022 at 11:45am — No Comments

Full Duplex Fast QSK CW QSO over IP using a multipurpose Gstreamer Script on a Raspberry PI & laptop

the Gstreamer Script used in this video example:


gst-launch-1.0 -v alsasrc device=hw:4 ! "audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)2, channel-mask=(bitmask)0x0000000000000003" ! tee name=t !…


Added by Chuck aa0hw on July 30, 2022 at 2:13pm — No Comments

QRQ CW 'copy by ear' PRACTICE using Mixxx with CW REGENERATION & a tracking CW audio bandpass filter

Mixxx is a VARIABLE SPEED audio player that works great to slow down or speed up a QRQ CW audio file. Mixxx also has a REVIEW/rewind function that allows you to repeat the last word sent as many times as you want(by hitting the keyboard letter 'A' can also repeat while slowing it down... MIXXX will change the cw frequency however....…


Added by Chuck aa0hw on July 23, 2022 at 9:50am — No Comments

QRQ CW net over SONOBUS - recorded from their LIVE STREAM on 7-12-2022 - using a CW REGEN method on all 3 OPs sending

ARCHIVED whole stream is located here: CRSnet.mp3 (Jul 12, 2022 11:44:49 UTC)

a CW…


Added by Chuck aa0hw on July 12, 2022 at 11:49am — No Comments

CW SIDETONE CLEANER - polish up and take the harshness out of that Sidetone with Zamgate & BP Filter

zamgate is a used as a 'GATE', to help balance and equalize the RISE/FALL time of the original CW NOTE passing through it

a BANDPASS FILTER, finishes the job by cleaning up and reducing the unwanted/unpleasant Morse Code audio…


Added by Chuck aa0hw on June 16, 2022 at 7:55am — 3 Comments

QRQ CW Tesla Coil with FERRITE CORE Transmit Antenna at 75Khz - sending CW at 75wpm - LIVE demo

Brief demo of using a TESLA COIL with a ferrite core, self resonant at @ 75Khz - sending QRQ CW at 75 wpm The tesla coil primary winding is about 7 turns, fed by a 10 watt audio amp both TX/RX use soundcard SDR's with soundcards operating at 192Khz sample rate using the RECRI KEYER SDR modules and CW KEYBOARD to modulate and demodulate at…


Added by Chuck aa0hw on March 7, 2022 at 4:43pm — 1 Comment

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

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

test sending CW over IP with the EAC3 codec at Zero Hertz - demod the RX signal with a soundcard SDR


brief test to see how well the EAC3 CODEC can reconstruct the ON /OFF cw element framework of Morse Code from a CW KEYER sending CW at "0" hz

NOTE: test starts out at QRQ speeds, then CW speed goes down to 20wpm, gradually back up again and over 100 wpm, then back down, to give an idea of how this experimental Morse Code…


Added by Chuck aa0hw on April 13, 2021 at 12:51pm — No Comments

ULF BAND Receive Ferrite Core Loopstick Antenna for SOUND CARD INPUT - LIVE DEMO with QRQ CW example

brief rundown of using a large FERRITE CORE LOOPSTICK tuned ANTENNA to hook up directly to the sound card input...and then use some SDR software modules to get rid of HUM, NOISE, HISS and other EMF QRM from the house wiring emf'N into the RX antenna etc...

the ULF CW TRANSMITTER is a PI 4's audio output - going to a 30…


Added by Chuck aa0hw on January 25, 2021 at 12:46pm — No Comments

Send QRQ CW using a LINUX CW KEYBOARD that appears on your WINDOWS 10 PC in Real Time at Near Zero Latency

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - RECRI KEYER - using SSH -X on windows to bring up the PI4 CW KEYBOARD on the WINDOWS 10 DESKTOP (uses REALvnc to attach the connections from the CW KEYBOARD MIDI…


Added by Chuck aa0hw on November 1, 2020 at 5:30pm — No Comments

The QRQ CW RE-Keyer System - a harsh square wave IN - pure sine wave OUT - with Raised Cosine edges

demo of taking the harsh square wave output of any kind of keyed CPO or CW Keyer's audio output - and RE-KEYING it exactly but transforming it to a pure sine wave CW NOTE with Raised Cosine edges (only takes 6 milliseconds from start to finish) uses ZAMGATE in SIDECHAIN MODE which has a pure sine wave TONE GENERATOR connected to Zamgate port…


Added by Chuck aa0hw on October 4, 2020 at 8:00pm — 8 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

Receiving a QRQ CW signal on VLF using QUISK SDR and wire antenna attached to sound card input

brief demo showing QUISK SDR and a wire antenna hooked up to the PC's sound card input
- picking up a weak QRQ CW signal on VLF - 18 khz

- by using the AGC on QUISK SDR and sending the QUISK SDR receive audio through the CALF EQ 5 BAND lv2 plugin, the weak signal is brought up significantly to improve copy

Added by Chuck aa0hw on February 12, 2020 at 3:25pm — No Comments

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