Chuck aa0hw's Blog (403)

FROM STEVE HARRIS SWH PLUGINS DIODE PROCESSOR 2.32 Diode Processor (diode, 1185) Mangles the signal as if it had been passed through a diode rectifier network.You should probably follow this with a DC offset remover, unless you want the offset. Mode (0 for none, 1 for half wave, 2 for full wave) The mode parameter is continuously variable…

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…

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…

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

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…

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:…

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…

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:…

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…

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

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

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…

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…

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…

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…

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…

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…

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…

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…

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…

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:…