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DIY-Spy: a homebrew 2.4GHz wi-fi spectrum analyzer
- jacquesm 17y agoNeat hack. The word 'spectrum analyzer' is used fairly loosely though, fortunately the author is quite aware of it, and uses it tongue-in-cheek. This thing sweeps a limited number of channels and displays signal strength in each. That's a basic use of a spectrum analyzer, but calling this a spectrum analyzer is the same as calling your soundcard an oscilloscope. What if you want to see what is happening between the bands ? That won't work because of the discrete steps between the channels, 5 MHz per step. Those are pretty wide gaps, you could hide a whole bunch of FM-stereo radio stations between those channels and you'd never know about it. On a real (sampling digital using fft or analog) spectrum analyzer those would stand out pretty clearly. The FM band is elsewhere (88-108 Mhz, not in the 2.4 GHz range), but an FM-stereo station usually has a swing of about 200 KHz, and on a 5 MHz channel separation 200 Khz is just a drop in the bucket.