it was only a matter of time before someone built a homebrew spectrum analyzer with these ingredients. This great build is the project of [Stephen Ong] and he’s even released all the softwares ...

The NanoVNA made network analyzers cheap enough for almost everyone. Now you can get a $49 spectrum analyzer to go with it. Is it worth it? Watch [IMSAI Guy]’s video after the break for his opinion.

After the signal is detected, it is passed through a narrow-band video filter to clean up the display. The LO is a very important part of the spectrum analyzer. The frequency stability and phase noise ...

uses a large number of fixed filters to implement a spectrum analyzer. Another approach is to use one filter, but to make it tunable over the frequency range of interest (Figure 5-1). Since this ...