I have talked about the “origin story” for CE a few times in the past. If you’ve never read about it, the short version is that I was super frustrated with my signals class in college not showing why a mathematical technique is useful. Mike Ossmann (of Great Scott Gadgets) makes the HackRF. In this tutorial, you can see basically what I had hoped for in that class all those years ago. It’s a great real world example of signal processing applied to real things (radio signals). I don’t recommend you get the HackRF if you’re just starting out, but this is worth a watch even if you’re not using it:
That’s a great resource to have for SDR and signals in general. Michael Ossmann has a gift for making complicated subjects easier to understand.
Fun fact: I filmed this one!
Also: sorry for the crappy filming!