title: Problem on QT GUI Frequency Sink GNU Radio Windows
body: <p>I tried to generate a Gaussian noise signal having a standard deviation of 1 by setting the amplitude value in the noise source configuration to 1.</p>
  <p>When I tried to display it using the QT GUI Frequency Sink, I initially expected that the resulting PSD would fluctuate around 0 dB across all frequency points. However, I have found that the PSD displayed at QT GUI Frequency Sink fluctuates around -40 dB (instead of 0 dB) over all frequency points.</p>
  <p>From the signal processing theory's point of view, this result is clearly incorrect.</p>
  <p>Is there a bug in my app that I don't know?</p>
  <p>I am using GNU Radio application v3.8.2.0-57-gd71cd177 (Python 3.9.0) on windows 10.</p>