Key'D TLC555 Square Wave Oscillator to PURE SINE WAVE CW NOTE with Raised Cosine Edges by RECRI SDR

FLdigi is keying a TLC555's pin 4/POS rail to send out a square wave CW NOTE at 1850 hertz - goes to a PI4 usb sound card's LINE INPUT...goes to a HILBERT CELL, then a BANDPASS FILTER(centered at 1850hz) then to a GAIN MODULE(+3db) then to an LO-MIXER that allows you to choose ANY CW PITCH and still keep the bandpass audio filtering bandwidth and "Q" centered at the CW AUDIO FREQUENCY you choose with the LO-MIXER GUI

RECRI KEYER SDR MODULEs: https://github.com/recri/keyer

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Comment by Chuck aa0hw on July 26, 2022 at 9:10am

testing OPUS AUDIO CODEC bitrates for Morse Code Audio over iP via SONOBUS

this video is a follow up video from the previous video that is using a 555 square wave oscillator as the 1st part of a keyed sidetone for the input of Sonobus: https://youtu.be/hMdCdJpP1V8 SONOBUS https://sonobus.net/

256K OPUS bitrate seemed to be very close if not equal to the 16 bit PCM uncompressed TRANSMIT option

SonoBus has multiple OPUS and PCM bitrates to choose from for the TRANSMIT STREAM

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