Spectrum analyzers are not unfamiliar devices. They come in different sizes, with the larger ones as bulky and heavy as the old oscilloscopes in college physics labs, and the smaller ones as portable and handy as a Nintendo handheld console. The function of a spectrum analyzer is to detect radio signals, accurately capturing the invisible and intangible electromagnetic waves in the air and displaying them on an oscilloscope.
A peak appears at the 14MHz mark on the horizontal axis if there's a wave at 14MHz.
A peak appears at the 144MHz mark on the horizontal axis if there's a wave at 144MHz.
The number of peaks corresponds to the number of waves; two waves yield two peaks, and a stronger wave produces a higher peak.
