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Someone needs to design a spectrum analyzer smartphone app that connects via the USB charging cord to a TV tuner dongle.
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Well, you can do that in Linux on computer. Skipped my mind earlier. Costs only a few dozen dollars plus time and a computer. It's called an SDR (Software Defined Radio) analyzer. They're not very fast, but they're inexpensive. I don't know off hand if any of the regulars here have talked about it, though.