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spectrum analyzer problem

From: Ali G. Dezfuli
Subject: spectrum analyzer problem
Date: Wed, 30 Jun 2021 13:49:40 +0430

Hi all,

I wonder if this is a bug or what:
I just make a QPSK constellation on the unit circle with quite random data and
look at the spectrum by "QT GUI Frequency Sink" block in GRC.
With these parameters:
    FFT size = 1000
    Window type = None OR Rectangular
I should see a flat line as the spectrum with -30 dB (= -30 dBW) but surprisingly it
shows -33 dB !!!
I use GNU Radio Companion and ubuntu 16.04.
Would be grateful if you could help me in this matter.


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