Spectrum analysis on the cheap.

If you’ve ever hacked around with wireless communications, in particular data networking chances are you’ve come across the oh-so-nifty USB spectrum analyzers that operate in the gigahertz range (which 802.11a, b, and g networks, among other wireless applications, operate within). The idea is simple: you plug the analyzer into a USB port on your laptop, fire up the software, and you can see the whole spectrum broken down into channels with relative signal strengths representing activity on the screen just like in the movies. While granted this can be a useful tool for anyone doing serious RF …

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