All Blog Posts (418)

enGage a Gate, to get rid of QRQ CW, NARROW BAND, high "q", ringing on CW RECEIVE SIGNAL - LiVE DEMO

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…

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Added by Chuck aa0hw on May 31, 2023 at 7:29am — 5 Comments

extreme DATA RATE for an EXTREME NARROW BAND QRQ CW signal - on the ELF band - 12 hertz

using the ENB-CW method of  encoding/decoding

brief test to see how well using the ENB-CW method to transmit and receive 12 hertz ELF EMF - for RADIO COMMs of a 'THROUGH THE EARTH' Cave Radio Transceiver prototype

NOTE: not shown on video is the MIXER, that up-converts the 12 hertz ENB-CW carrier to a 782 hertz…

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Added by Chuck aa0hw on May 27, 2023 at 12:42pm — No Comments

VLF QRQ CW Transmitter: keying a TLC551 [sq, wave osc.] to CLASS D audio amp to high Q Ferrite Resonant Antenna

this is a follow up video from the 1st one here:

for more info on the VLF TRANSMITTER SETUP see this video's description:

https://youtu.be/FyYHmT7POKA

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

QRQ CW on VLF band @5Khz @75wpm: alternative RX method using a soundcard SDR and HiGH "Q" antennas

with high Q antennas systems for RX/TX there is too much ringing & cw element elongation for good copy retrieval from the SDR down conversion from 5Khz to CW AUDIO... an alternative to straight mixing is to REGENERATE the CW from its unusable ringing cw elements...however, the elements volume peaks have to be equalized in volume by a DSP…

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Added by Chuck aa0hw on May 20, 2023 at 11:45am — No Comments

Pulse Density Modulated QRQ CW test @80wpm on the ULF BAND through high Q, resonant Ferrite Antennas

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:…

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Added by Chuck aa0hw on May 19, 2023 at 7:32am — No Comments

get rid of HIGH Q Ringing on QRQ CW by using a LiMiTER & CW Regenerator

with high Q ringing on a QRQ CW signal, by high Q filters &/or high Q antennas, you are going to get CW ELEMENT RINGING and CW ELEMENT ELONGATION which distorts the typical wave shape of the DITs and DAHS... especially on the DITs...the elongation will decrease its volume since the element takes to long to reach peak output compared to a…

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Added by Chuck aa0hw on May 18, 2023 at 9:17am — No Comments

sending QRQ CW over iP on LF BAND using CW notes made of 8Khz wide, white & violet noise CW elements

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:…

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Added by Chuck aa0hw on May 9, 2023 at 5:25pm — No Comments

CW KEYER SQUARE WAVE output converted to SHAPED SiNE WAVE output by LSP SiDECHAiN & LSP OSCiLLATOR

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&section=oscillator_mono…

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Added by Chuck aa0hw on May 8, 2023 at 2:16pm — No Comments

VLF QRQ CW RX signal gets direct conversion to CW AUDIO by LSP Sine Wave Oscillator & Sidechain Gate

only 2 LSP Plugins are needed for DIRECT CONVERSION from VLF CW to AUDIO CW

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

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Added by Chuck aa0hw on May 8, 2023 at 8:44am — No Comments

Gaussian-25 Raised Cosine Window for sending QRQ CW through a HiGH "Q" Resonant TX/RX antenna system

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…

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Added by Chuck aa0hw on April 28, 2023 at 9:56am — No Comments

ZAMGATE QRQ CW WAVEshape Restorer - fixes problem of narrow band high Q CW filter RiNGing/distortion

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…

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Added by Chuck aa0hw on April 22, 2023 at 7:07am — No Comments

setup a CW COPY BY EAR practice session on the VLF band using unixCW, Gstreamer & 2 Ferrite Antennas

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…

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Added by Chuck aa0hw on April 20, 2023 at 12:51pm — No Comments

Large Ferrite Rod TRANSMiT Antenna for 21Khz on the VLF band - high Q resonant tuned input & output

using a biploar tesla coil with a large ferrite core, 30 windings primary input, and 300 turns secondary output both input and output are tuned for MAX signal output at 21Khz

- input is tuned by a .1uF series resonating CAP, and output is tuned by a .001uF parallel resonating CAP

QRQ CW example for…

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Added by Chuck aa0hw on April 13, 2023 at 8:06am — 1 Comment

Morse Code\\Contour CW MODE// sending 2-D CW NOTE framework data OVER iP instead of CW AUDIO over iP

uses RECRi KEYER CW & SDR modules: https://github.com/recri/keyer RECEiVE

OP can choose at what CW AUDIO Pitch whey want to listen to, with the RECRi KEYER's SDR MIXER MODULE

NOTE: OPUS CODEC will not work to send Contour…

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Added by Chuck aa0hw on March 22, 2023 at 7:58am — No Comments

unixCW sending CW @30kHZ on VLF BAND using ALSA LOOPBACK cables - TX/RX demo using FERRiTE ANTENNAS

UNiXcw using this script to keep the TEXT FiLE to CW sending on an auto-repeating endless cycle, (until you hold CTRL/c down until it stops) qrq@qrq:~/Downloads/unixcw-3.6.0/src/cw$ while true; do (./cw -d hw:1,1,1 -f teslalecture1.txt -w 60 -k 50 -t 30000 -v 90); sleep 1; done…

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Added by Chuck aa0hw on March 17, 2023 at 9:01am — No Comments

TRiPLE RESONANT TUNED High "Q" TX & RX Large Ferrite Rod Antennas for VLF CW operations - LiVE DEMO

FERRITE TX ANTENNA is max tuned for PEAK SIGNAL OUTPUT on 30Khz VLF CW input windings of ferrite rod TX antenna is SERIES TUNED by CAPs and output windinws of ferrite rod TX antenna is PARALLEL TUNED by CAPs FERRITE

RECEIVE ANTENNA is max tuned for PEAK SIGNAL RECEIVE signal on 30Khz VLF CW by a .1uF cap and the BEST coil…

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Added by Chuck aa0hw on March 14, 2023 at 1:12pm — 1 Comment

Pulse Density Modulated HF CW Transmitter/afcw mode\ {Saves Battery Power !} for portable operations

since the TRANSMITTER is not using full duration CW ELEMENTs(using AFCW MODE)(a2) Battery Drain should be less when operating portable via PDM-CW methods

ZAMGATE is the PDM-CW encoder: https://www.zamaudio.com/?p=976

GSTREAMER SCRIPT provides…

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Added by Chuck aa0hw on March 8, 2023 at 2:16pm — 2 Comments

using GASSiAN NOiSE CW notes for sending Morse Code over iCW on Mumble - CW regenerated on mumble RX

instead of sending pure sine wave CW notes over Mumble, "GAUSSIAN NOISE" CW NOTES are used to see if GAUSSIAN NOISE CW audio performs better over iP on Mumble(OPUS CODEC), than pure sine wave CW audio

https://sites.google.com/site/icwoip/

CW…

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Added by Chuck aa0hw on March 8, 2023 at 9:25am — No Comments

NETJACK - AOiP - REMOTE RIG operations for CW - using AFCW MODE to key the RIG - uses Raspberry pi2b

brief demo showing the setup from a remote laptop's location on how to key the rig remotely from another room in the house uses NETJACK and a pi2b as the NETJACK server which is connected to the RIG's internal USB SOUND CARD(ELECRAFT K3S)

more info on NETJACK here:…

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Added by Chuck aa0hw on February 16, 2023 at 2:08pm — No Comments

NETJACK - Midi over iP on a PRIVATE ZEROtier Network - Morse Code Midi CW KEYER example demonstrated

brief demo of sending Midi CW over the internet to key midi input CW sine wave oscillator APPs; using a PRIVATE ZEROtier network where you don't have to port forward routers, but you do have to be an accepted, authorized member of the ZEROTier NETWORK that is being used more details of setting up

NETJACK from…

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Added by Chuck aa0hw on February 16, 2023 at 11:50am — No Comments

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