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Spectrum analyzer
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==== Online realtime and offline realtime ==== In a sense, any spectrum analyzer that has [[vector signal analyzer]] capability is a realtime analyzer. It samples data fast enough to satisfy Nyquist Sampling theorem and stores the data in memory for later processing. This kind of analyser is only realtime for the amount of data / capture time it can store in memory and still produces gaps in the spectrum and results during processing time.
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