PowerSDR v2.2.3.dual_Mercury (K5SO 25MAR2012) is available for download at http://www.k5so.com/Dual-Mercury%20Program.html This program adds dual-Mercury, diversity/signal nulling functionality to Doug W5WC's latest (single Mercury) PowerSDR v2.2.3 (3/23/12) program. 73, Joe K5SO