filtering the output of a TWIN-T CPO using a custom build GAUSSIAN audio bandpass filter from W3NQN

for more info on this special custom build for filtering QRQ CW, from W3NQN, please see previous videos and their notes in their video descriptions:

https://youtu.be/lrJF2Av4k90

https://youtu.be/QJEK184CZPA

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