Spectrum analyzers measure the magnitude of an input signal over a specified frequency range, displaying signal frequency, power, distortion, harmonics, etc. - parameters that are not easily available with time domain waveforms. Standard spectrum analyzers sweep a limited frequency band receiver over the range of the instrument, but this means that intermittent or frequency-hopping signals will be missed or incorrectly reported. Real-time analyzers don't have that limitation since they use overlapping FFTs to view the whole spectrum range at the same time. Real-time techniques simplify spectrum monitoring to quickly capture, identify, and analyze complex RF environments containing frequency hopping signals, channel conflicts and spectrum interference.
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