[Discuss-gnuradio] Waterfall display in uhd_fft

[Daniel Marlow]

Hello,

  We are running gnuradio v 3.7.8 on Ubuntu 15.08.  H/W is B210.    We are 
looking at our self echo from EME (moon bounce).

  When running uhd_fft, we see clear EME echo signals on the FFT display (10-20 
db above the noise).   However, we don't see these signals on the waterfall 
display.  We do see the very large signals when we transmit.    Is there a way 
to adjust the "vertical" range of the display so that the noise is mapped onto 
something black or nearly so and signals 20 db above the noise appear as bright 
colors?    

Sincerely,
Dan Marlow