[hpsdr] PowerSDR Diversity

[Joe Martin K5SO]

Yes, Jeremy is correct; if diversity operation is what you're after  
you will need to use at least two Mercury boards each with it's own  
independent rf input source.  A single Mercury board will not permit  
diversity operations for the reasons Jeremy noted, namely that there  
needs to be two independent IQ streams for diversity operation.   
Further, the two Mercury receivers must be operated coherently, as  
detailed on my website www.k5so.com/HPSDR_downloads.

In my message to Dan I was addressing his specific question of how/ 
whether multiple receivers can be operated using a single Mercury  
board with the PowerSDR v1.19.3.4.diversity20 program, which they  
can...but not in diversity mode, of course.

73,  Joe K5SO


On May 16, 2011, at 7:50 AM, Jeremy McDermond wrote:

> Please correct me if I'm wrong, Joe, but:
>
> You cannot use any of the benefits of the diversity code with two  
> "receivers" on a single Mercury.  You need to have a diverse antenna  
> to make the code work correctly, and you can't do that with a single  
> Mercury card.  Remember that the "receivers" on a single Mercury are  
> only like "virtual receivers."  It uses the same samples coming off  
> of the same ADC, it's just merely applying a different filter to the  
> data.  This means that theoretically if you set the "virtual  
> receiver" to the same sample rate and same frequency you'll get  
> exactly the same samples.  This defeats any diversity receive you're  
> trying to accomplish.
>
> So, in summary, to play with Joe's diversity code and use the  
> advantages of diversity receive you need to have two separate phase  
> locked Mercury boards tied to two separate antennas.
>


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