I was researching spectrum analyzers. If you are a hobbyist, this is a great deal for a spectrum analyzer. It is a bit of a challenge but if you are technical at all, you fill find this a great project. Check out these videos. A Spectrum analyzer is a receiver that receives all frequencies in a given range and displays a graphic representation of the received wave forms corresponding to each frequency in the displayed window including power levels. This is the way to understand and learn about the signals and tracking equipment that we know nothing about yet.