Interrupt Modulated(IM) QRQ CW Mode transmitting and receiving digital information using an analog carrier where the required bandwidth is limited to approximately the frequency of the analog carrier signal. The method is called interrupt modulation and consists of interrupting an un-modulated carrier signal so the…
ContinueAdded by Chuck aa0hw on March 28, 2024 at 9:49am — 1 Comment
using a 21Khz sine wave oscillator signal source, and 2 individual AUDIO THRESHOLD to CW MIDI output GATEs, and the RECRI KEYER's midi input iambic CW Keyer Module, using just one laptop Stereo sound card to route audio stereo audio outputs and stereo audio inputs a way to use just one stereo audio sound card native to…
ContinueAdded by Chuck aa0hw on March 1, 2024 at 11:08am — No Comments
uses REAGATE GATE app to trigger a midi note output from the straight key 32Khz signal input to a sound card line input, output of REAGATE app sends a CW MIDI NOTE to key the RECRI KEYER's CW KEYER module https://github.com/recri/keyer
NOTE: this recri…
ContinueAdded by Chuck aa0hw on February 28, 2024 at 2:37pm — No Comments
using high Q, tuned, resonant VLF ferrite TX & RX VLF antennas(4.078Khz) a QRQ CW square wave into the resonant, tuned, high Q, TX antenna produces minimal harmonics...and even less of those harmonics survive by the time the same type of RX ferrite rod high Q, tuned, resonant, antenna removes even more of the…
ContinueAdded by Chuck aa0hw on February 27, 2024 at 9:10am — No Comments
working with 4Khz VLF ferrite rod TRANSMIT and RECEIVE antennas that are High Q & tuned to resonance(see previous 2 videos for the more info on the FERRITE ROD HIGH Q antennas being used for TX & RX on 4Khz VLF):…
ContinueAdded by Chuck aa0hw on February 23, 2024 at 10:53am — 1 Comment
https://friture.org/ ; has versions for WINDOWS, MAC, and Linux
RECRI KEYER's CW KEYBOARD, FILT & MIXER modules used in this video demo:
Added by Chuck aa0hw on December 28, 2023 at 9:31am — No Comments
using the info at GOOGLE PATENTs, this "TUNED" twin coil ferrite rod loopstick VLF Receive Antenna was put together from some spare parts in the shack, for a test run at 32Khz for receiving a QRQ CW signal at 32Khz…
ContinueAdded by Chuck aa0hw on October 19, 2023 at 8:21am — 2 Comments
in AFCW mode, a CW KEYBOARD keys 2 sine wave oscillators at 1500 hertz & 1520 hertz, the beat frequency creates the PULSE DENSITY MODULATED CW beat frequency that will become the PDM-CW TRANSMIT SIGNAL sending to the TRANSMIT INPUT on LSB at 1500 hertz(AFCW MODE)
on RECEIVE, trigger midi mono…
ContinueAdded by Chuck aa0hw on October 5, 2023 at 7:08am — No Comments
brief demo using a simple GATE plugin, to STOP QRQ CW Ringing on the RECEIVE SIGNAL
gate is placed after antenna input, and before final CW AUDIO bandpass filter
GATE used in this example is from CALF STUDIO GEAR…
ContinueAdded by Chuck aa0hw on May 31, 2023 at 7:29am — 5 Comments
this is a follow up video from the 1st one here:
for more info on the VLF TRANSMITTER SETUP see this video's description:
in this video, an MFJ451 CW KEYBOARD keys the TLC551 at QRQ speeds
Added by Chuck aa0hw on May 23, 2023 at 11:34am — No Comments
brief test to see if QRQ CW at 80 wpm could be PULSE DENSITY MODULATED effectively for transmit/receive on the ULF BAND at 1.784 Khz using very high Q resonant ferrite rod loopstick TX/RX antennas
for more info on PULSE DENSITY MODULATED CW(PDM-CW) please see this playlist:…
ContinueAdded by Chuck aa0hw on May 19, 2023 at 7:32am — No Comments
WHiTE and ViOLET Noise are combined and filtered
to only transmit from 40Khz to 48Khz
and this noise is used to create CW NOTEs that are 8Khz wide on the LF BAND
uses CW RE-KEYING methods shown on this playlist:…
ContinueAdded by Chuck aa0hw on May 9, 2023 at 5:25pm — No Comments
SQUARE WAVE to SHAPED SINE WAVE CONVERTER using 2 plugins from LSP
1. LSP SIDECHAIN MONO
2. LSP OSCILLATOR MONO
https://lsp-plug.in/?page=manuals§ion=oscillator_mono…
ContinueAdded by Chuck aa0hw on May 8, 2023 at 2:16pm — No Comments
only 2 LSP Plugins are needed for DIRECT CONVERSION from VLF CW to AUDIO CW
https://lsp-plug.in/?page=manuals§ion=oscillator_mono…
ContinueAdded by Chuck aa0hw on May 8, 2023 at 8:44am — No Comments
testing QRQ CW using a GAUSSIAN-25 raised cosine window, through HIGH Q, RESONANT, TUNED, FERRITE ROD TRANSMIT & RECEIVE ANTENNAs on the VLF BAND at 3.6Khz
towards the end of the video, several other RAISED COSINE WINDOWS are selected to see how they LOOK/SOUND compared to Gaussian-25
CW KEYER and…
ContinueAdded by Chuck aa0hw on April 28, 2023 at 9:56am — No Comments
the ZAMGATE CW wave shape RESTORATION system, takes the incoming HiGH Q, RiNGiNG and distorted QRQ CW waveshape, from a 3.5kHZ ULF QRQ CW SiGNAL, and restores it to a pristine, raised cosine adjustable rise/fall time, adjustable pitch CW WAVEshape CW NOTE
The distorted, ringing QRQ CW waveshape seen in this video is from a…
ContinueAdded by Chuck aa0hw on April 22, 2023 at 7:07am — No Comments
unixCW script to send a text file that keeps repeating until you hit/hold Ctrl-C until it stops... ~/Downloads/unixcw-3.5.1/src/cw
$ while true; do (./cw -d hw:0,1,0 -f YOURTEXTFILE.txt -w 40 -k 50 -t 20200 -v 8); sleep 1; done
NOTE:
-t = frequency that unixCW sends out…
ContinueAdded by Chuck aa0hw on April 20, 2023 at 12:51pm — No Comments
CW MAESTRO inside DOSBox-X seemed to work much better than using the native DOSBox app(for linux) the QRQ CW audio output was more stable using DOSBox-X(normal dosbox itself had lots of audio dropouts with the same settings) CW MAESTRO FULL VERSION by permission of CW MAESTRO creator/DEV available here for download(.7z file)…
ContinueAdded by Chuck aa0hw on February 14, 2023 at 11:21am — No Comments
using the CW KEYBOARD that is already loaded up on a Raspberry Pi4 on the local network using ssh -X via Xquartz for the mac https://www.xquartz.org/
SETUP
ssh -X into the pi, bring up lxterminal, migrate to the CW KEYER software APP FOLDER bin, by…
ContinueAdded by Chuck aa0hw on February 8, 2023 at 10:00am — No Comments
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…
ContinueAdded by Chuck aa0hw on January 26, 2023 at 1:58pm — No Comments
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
© 2025 Created by Chuck aa0hw.
Powered by