[hpsdr] Diversity reception w/dual Merc boards

[Joe Martin K5SO]

For all those who asked to be kept appraised of my diversity reception  
project progress:

KISS Konsole (Windows) RCV-ONLY version is now up and running  
successfully with two Mercury boards on the Atlas bus, providing  
spatial diversity reception (if two spatially separated antennas are  
connected to the Mercury boards) or polarization diversity (if two  
sources of different polarization orientations are connected),  
including an ability to sync  time-domain acquisitions to an  
externally applied pulse to Atlas bus line A19 (for time-domain pulsar  
work, for example).

At the present time the two receivers are operating on the same  
frequency but it's straightforward (and is on the "to do" list) to add  
independent frequency control of the second Mercury in case frequency  
diversity is desired instead (even for two different bands).

The diversity option is front-panel selectable (RCVR1, DIVERSITY  
(BOTH), RCVR2) and should not be a problem to implement in the  
standard (Tx & Rx) version 1.0.6 of KISS Konsole.

It might be a while before there's a public release of KISS Konsole  
with these features but, of course, I'd be happy to share this early- 
alpha-stage code immediately with anyone that is interested.

Seems to work fine here!

73,  Joe K5SO