Stock, this radio module is just okay, but with a few modifications, it can be turned into a very good receiver with a spectrum analyzer ... and this is where most RC hobbyists stop.

[Ryan] wanted a spectrum analyzer for his audio equipment ... [Ryan] used simple resistor capacitor (RC) filters to implement his design. All those discrete components would quickly attenuate ...

The electromagnetic spectrum consists of a group of radiations that all travel at the speed of light (\(3\times 10^{8},m\,s^{-1}\)). In the middle of the EM spectrum is the visible spectrum ...