This should work with the LimeSDR devices, but I cannot try it since my LImeSDR mini died.
Icom IC-R8600 - Creating an All Frequency Power Spectrum.
This video tells how to create an all frequency power spectrum for the Icom IC-R8600 and It shows how the 3GHz 300,000 point power spectrum can quickly be searched for interesting new signal sources.
I have added a zip file (SdrGlut-1098-Windows.zip) to the
release that contains the sdrReceiveWindows.exe and mMysticPlot.exe programs. Try it yourself !