The best replacement for spectrum analyzer is oscilloscope.


The best alternatives to spectrum analyzer are rated as following:
★★★★★  oscilloscope
★★★★★  network analyzer
★★  signal analyzer
★★  power meter
★★  emi receiver
★  vector signal analyzer
★  oscilloscope fft
★  vna
★  spectral analyzer
  receiver
  field strength analyzer
  dso

Your alternative for spectrum analyzer is not listed? Suggest!
Speaking about spectrum analyzer, one probably shouldn't forget about oscilloscope.

Other search terms related to spectrum analyzer and their ratings are:

★★★★★ oscilloscope
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Google Trends

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spectrum analyzer
oscilloscope
network analyzer