de JF2IWL (CC; SkimmerTalk) I have done the last Skimmer Study using three Red Pitayas. http://59925.org/misc/SkimServ_SDR_comparison/ The next step is how to how to emerge " Clean Decorders ". Thank you for RBN OPs and RBN team for many suggestions and advises. Dai JF2IWL -- Dai NAGAKURA <ndai at cameo.plala.or.jp>