[hpsdr] PowerSDR Diversity

[Jeremy McDermond]

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.

On May 16, 2011, at 5:45 AM, Joe Martin K5SO wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Dan,
> 
> VFO A and VFO B functions within PowerSDR v1.19.3.4.diversity20 to provide two receivers on a single Mercury within the bandwidth provided by the sampling rate selected (192KHz, 96KHz, 48Khz) as usual.  PowerSDR v1.19.3.4.diversity20 supports dual Mercury boards simultaneously on the Atlas bus but not multiple receivers on a single Mercury, except for the VFO A and VFO B functions which work as usual to support multiple receivers within the sampling bandwidth.
> 
> At the present time both Mercury boards operate on the same frequency in PowerSDR v1.19.3.4.diversity20; however, there is no fundamental limitation that requires that to be the case.  In principle, the two Mercury boards can operate on completely different bands if desired, of course, though that feature is not implemented in PowerSDR v1.19.3.4.diversity20 currently.
> 
> 73,  Joe K5SO
> 
> 
> 
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--
Jeremy McDermond (NH6Z)
Xenotropic Systems
mcdermj at xenotropic.com




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