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One more detail:
In pull-down menu "File->Properties", for measurements I am doing now (settings are: dwell=0.131s, FFTsize =16), I am getting for RBW=250kHz.
On display there are couple of carriers sitting at leve, say l = -10dB/SQRT(Hz).
They are not the noise, so power level of those peaks calculated from RBW will not be correct...