Chuck aa0hw's Blog – November 2020 Archive (5)

go to keyer.elf.org

wireless transmission from the CW KEYER - keying a 555 at 40 Khz - to a wireless LF RF BAND software receiver - demod'N the 40 Khz CW Keyer LF BAND transmitter's CW

the TX and RX antenna are using a high Q , series/parallel resonated FERRITE BOBBIN CORE INDUCTOR COIL - @2mH each - series and parallel resonating capacitors…

22 individual CW software KEYBOARDs are sending a CW text file from 500 hertz up to 11Khz

separated individually by 500 hertz from one signal to another

to pick a CW SPEED/signal that you would like to copy by ear - use your SDR

- here is a quick example of doing that here with a…

60 wpm test - classic R-C exponential envelope VS Raised Cosine - for copying by ear - which do you prefer ?

NOTE: to get the RAISED COSINE edges from YPlog, its RISE/FALL time was set to zero and sent through this simple Gstreamer CW AUDIO BANDPASS filter…

uses a remote RASPBERRY PI 4 that hosts the LINUX CW KEYBOARD from AD5DZ - RECRI KEYER - https://github.com/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…