Chuck aa0hw's Blog – April 2023 Archive (4)

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…