This post is all about the E4000 (e4k) RTL-SDR Tuner, commonly found in the Nooelec RTL-SDR. It’s one of my favorite RTL-SDR tuners, but it can be incredibly frustrating to work with if it’s not left on AGC. This documentation is a work in progress, and a result of source code spelunking or reverse engineering. It may contain errors or outright lies. The names may not match the original name, but it's been documented on a best-effort basis to help future engineering efforts. Specifically,...
