I learned how to do the SSB demodulation, using the article mentioned in the previous post, and the tutorial grc_tutorial4. Forgive my fumbling attempts at a screen/audio capture, but here is recorded proof that it demodulated the recorded signal:
I first followed the tutorial to the letter, but that didn’t work, so I retranslated the ideas into some other blocks. Then I found I had to adjust the frequency some from what was described in the tutorial.
Here are just the blocks:
The Libre Hacker 