[Elecraft] P3 display versus FlexRadio

[Jim N7US]

I saw a demo last night of the FlexRadio bandscope.  It showed the noise
well above, on the Y-axis, the bottom of the display, but the waterfall
didn't show the noise, just the signals on the band.  

 

When I set the REL LVL on my P3 so the noise floor is below the noise, the
waterfall is blue from the noise, making it difficult to see the signals.

 

Can someone enlighten me as to why the displays are so different?

 

73, Jim N7US