I just couldn't remember the meaning since I've only read maybe a couple of articles on the topic. So I had to Google it, and it was the 4th result.

I tried to CTRL-F "SDR" on the article page, but there was no mention of what the abbreviation stands for. I realize it's meant for technically inclined readers, and it is a great article and project. I should've checked the linked websites first, but it was easier to just Google it :)

I'd include a short mention of what SDR stands for (maybe with a link to Wikipedia) at the top so people unfamiliar with it can get an idea of what they're about to read. Just imo.