I saw a talk the other week about Software Defined Radios and how they work, plus how to get into the hobby. One thing I felt was just minorly missing was some context on how useful SDR may be. Just today, I saw a link on Reddit to another Intro to SDR and RF Signal Analysis. Since seeing the previous talk, I can actually begin to digest this information, but more interesting are the real world applications near the lower half of this post.