[Elecraft] "Contester's Spectral Display" feature of N1MM software will be supported soon

[Steve London]

If you are looking for a simpler, no-cost option for using the N1MM+ 
spectrum display with a K3 or K3S, Waterfall Bandmap provides that 
capability, using LP-PAN, SDRPlay, or other SDR receivers that support 
an ExtIO DLL.

Waterfall Bandmap provides a standalone waterfall display, as well as 
forwarding spectrum information to N1MM+ for display by the N1MM+ 
spectrum display.

See:
https://groups.yahoo.com/neo/groups/waterfallbandmap/info

http://n1mmplus.hamdocs.com/tiki-index.php?page=Spectrum+Display+Window&structure=N1MM+Logger+Documentation

73,
Steve, N2IC