Well, not here. I decreased bandwith from 2048 to 300. I see the noisefloor roll off abt. 3 dB starting 15khz above cw bcn and 15khz below upper bcn when i set the beacons to the left and the right margin. SNR on the cw bcn drops to 37.something .Thus SNR of the cw beacon is 3dB lower compared to 2048 bandwith.
But this is only a function of levels. What bugs more is the qsb. So after almost a year i realize i still have work to do to improve rx.