Windowing Loss---not really
I just joined this forum. Today I ordered an RSP-1a and downloaded both the spectrum analyzer and SDRuno software. Of course, I can't do anything with it yet.
I have been a ham for 50 years next month, and have always been disappointed at the poor quality of affordable test equipment for the home experimenter. Even way back then I new that somehow a computer with A/D and D/A converter could be used to replicate "real" test equipment. The time has finally arrived to fulfill my dream!
About 20 years ago I was writing software algorithms for a commercial product that was a computerized RF test system. This included creating a spectrum analysis routine and gathering as much information as possible on the signal.
i would like to point out that nothing is 'lost' by using a FFT window function. Instead the power is spread out over several bins, with the number of bins being determined by the particular window function. By summing the power in those several bins the result will be the actual power in that spectral line.
There were a number of other 'tricks' I devised, but I can no longer recall the details.