[hpsdr] PowerSDR v1.19.3.1.diversity11 (K5SO 31OCT2010)

[Joe Martin K5SO]

PowerSDR v1.19.3.1.diversity11 (K5SO 31OCT2010) is available for  
download at

http://www.k5so.com/HPSDR_downloads.html

This version implements the "radar screen" style diversity control  
used in the Flex 5000 in its diversity mode.  In this present HPSDR  
release, diversity mode is no longer "constant gain" but instead the  
operator may independently adjust the relative gain and phase of the  
dual IQ data streams from the Mercury boards by dragging the yellow  
dot across the radar screen display.  The slider phasing control has  
been removed; replaced by the large radar screen control.

The phasing performance is enhanced relative to earlier HPSDR  
releases.  The operator has options to select "Mercury 1 only" or  
"Mercury 2 only" or "Diversity".

To see how this relatively large diversity control is used and what it  
looks like generally see the W9OY demo of a similar control that is  
used for the Flex5000 at

  http://www.youtube.com/watch?v=SD0V2D5S1dU&feature=player_embedded#

In the present HPSDR version it is not necessary to select "Enable" or  
"Sync" as these buttons are presently unnecessary and have even been  
temporarily removed from the control for the time being.  "Sync" will  
be useful in later versions, after frequency diversity is implemented  
for the HPSDR.

This latest version is suitable for "spatial diversity" in which two  
spatially separated antennas are connected to the Mercury boards or  
"polarization diversity" in which the two Mercury inputs are connected  
to antennas of different polarization angles.  Both Mercury boards  
operate at the same frequency.

I intend to begin work on a version that also includes "frequency  
diversity" so that the Mercury boards may be operated on different  
bands if desired.  In this case the "extra" RX2 controls that you see  
at the bottom of the screen in the video clip will also show up on our  
HPSDR display.  Those controls are not necessary if the Mercury boards  
are operating on the same frequency so are not shown in this latest  
HPSDR version.

73,  Joe K5SO

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