[CQ-Contest] What my ears can not hear does not matter

[Marijan Miletic, S56A]

I wonder if Charly, HS0ZCW ever tried PSK on HF?  These are often inaudible
signals barely visible on waterfall with perfect error-free print!  WSJT EME
is even better case.  Beware of human limitations.  Pilots are trained to
fly by instruments!
 
Absolute limitations on SDR is ADC overflow level which is around 1 mW.
Your contest kW kill them unless good frontend bandpass filters are used.
Fortunately lot of signals are amplitude modulated.

 

LP MMM S56A