Ken, I've been playing around with FMT using a home brew version of the SDR1000 receiver. I haven't tried with Mercury since I don't have a stable reference yet. Maybe you know, is the AD9854 synthesizer in the PowerSDR / SDR1000 programmed with a 32 bit word or do they use all 48 bits? Thanks. 73, Jim AF9A 1239063545.0