[hpsdr] special 2Rx RA version of OpenHPSDR PowerSDR

[Glenn Elmore]

Joe,

Thank you for doing this.  I really like it as well.

Can you tell me what the algorithm for reporting power is?  That is, how 
is the reported power calculated.  There are several ways of doing this, 
rms of several reads of individual bins, rms of multiple bins, log of 
averages, average of logs etc.  I know that for older spectrum analyzers 
that a correction factor was required to get to KTB, where B was the 
indicated 3 dB bandwidth of an IF filter with some particular shape 
factor.  This depended upon whether samples were peaks or averages, 
logged first or not and of course presumed something about the nature of 
the noise.

For a lot of things it's nice to be able to get to S/N from a displayed 
answer.

I suppose I can measure something carefully and see what the results are 
but I thought since you are already using this for RA that you might be 
able to say.

Best,
Glenn n6gn