[hpsdr] Diversity measurements

[Joe Martin K5SO]

Hi Alfred,

Very good.  Thanks for the tests!  Here, in the laboratory, I can  
consistently and completely null a 70 dB (or even greater!) signal  
into the two Mercury boards.

I'll check into the frequency change behavior you mention.  Earlier I  
fixed that bug;  it caused the phase to change when returning to the  
original frequency after a frequency change;  that is, unless the  
frequency change involved a band change and back, in which case there  
will be a change in phase for the null position.  Perhaps the Ozy  
version of firmware has a problem with the phase after a frequency  
change, in any event I'll check it out thoroughly with both Metis and  
Ozy when I get back home.  Perhaps the fix got inadvertently dropped  
during the recent revamping of firmware.  I'm out of town for a week  
so i can't work on it right at the moment but I will be back home on  
Tuesday and will take a look.

Of course, on air measurements will depend very strongly on the  
current rf path conditions, as you note.

Thanks again, Alfred!  Nice work.

73,  Joe K5SO



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