I was wondering why there is a usually flat limit on passband of every spectral masks.

For sidebands it makes sense but for passband not so much.

  • $\begingroup$ Can you provide an example? I'm not quite sure I understand your question. $\endgroup$
    – MBaz
    Oct 7, 2019 at 13:26
  • $\begingroup$ maybe you could also illustrate with a counter-example that you think would make more sense? $\endgroup$ Oct 7, 2019 at 17:02
  • $\begingroup$ I mean I do not understand putting a flat limit at the passband in spectral masks. For example, I sea here and there that scramblers can avoid having spectral lines in passband to help us meet the regulations' spectral masks. (and I know they have other benefits.) I wonder why. $\endgroup$
    – Ali
    Oct 8, 2019 at 15:21
  • $\begingroup$ but, what would be the alternative? How would you define that limit else? The flat spectral mask "No signal might ever exceed a spectral power density of so and so many dBm/Hz", and that applies to all signals, no matter whether they're narrowband (and hence spectral peaks) or wideband. Not quite sure what the alternative would be $\endgroup$ Oct 9, 2019 at 11:14
  • $\begingroup$ I do NOT say "it should not be flat," I say "there should not be a limit there." $\endgroup$
    – Ali
    Oct 12, 2019 at 5:53


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