[SignalsEverywhere] shows how to use it as a spectrum analyzer that works from the command line in the video you can see below. The software used is Retrogram.

[El Artis] just finished building an audio spectrum analyzer that uses a character LCD. The uses an Arduino to drive the display, but unlike other meters that use the microcontroller for analysis ...

How to use a spectrum analyzer, rather than a scope, to measure noise soruces that degrade ADC performance.

Modern wireless communications are using increasingly wide bandwidth-modulation schemes, and packet communications are getting faster. Transmissions are increasingly time-varying. Radios often ...