When I repeat using the spectrum analyzer again and again this makes me to have more experience to use it.
This lab let me guess about radio wave of taxi (e.g. why we listen only operator voice, what are factors of quality of signal, or else). The answer of “why we listen only operator voice” is taxi user use another wavelengths to prevent interface of signal. The divide frequency, multiplex code and difference kinds of time are ways to fix signal problem. When we guess about the defect of signal that is powerful to let me think.