Editing Spectrum analyzer (section)

=== Hybrid superheterodyne-FFT ===
Since FFT based analyzers are only capable of considering narrow bands, one technique is to combine swept and FFT analysis for consideration of wide and narrow spans. This technique allows for faster sweep time.

This method is made possible by first down converting the signal, then digitizing the [[intermediate frequency]] and using superheterodyne or FFT techniques to acquire the spectrum.

One benefit of digitizing the intermediate frequency is the ability to use [[digital filter]]s, which have a range of [[Digital filter#Comparison of analog and digital filters|advantages]] over analog filters such as near perfect shape factors and improved filter settling time. Also, for consideration of narrow spans, the FFT can be used to increase sweep time without distorting the displayed spectrum.

[[Image:Spectrum Analyser Time Domain Sampling and Blind Time.png|thumb|left|400px|Illustration showing Spectrum Analyzer Blind Time]]