One of the best ways to learn about radios is to build your own, even in the age of cheap SDR dongles. [Aniss Oulhaci] demonstrates this with a simple HF SDR receiver built on a breadboard.

Sometimes the best builds aren’t anything new ... and decoded again with an RTL-SDR dongle. It’s nothing new, per se, but if you’re looking for a short-range, low-bandwidth wireless ...