yes that’s exactly my configuration. I updated all receivers and CB200 to last version, Two 2.4 into CP to CB200 R1 and R2 and the 900 directly into CB200 ext port (receiver config selected in CB) actually testing in avanti ducted fan. working flawlessly. next step is using in the turbinator 2 with more telemetry (turbine and speed sensor) and 40 cm extension for receivers. thanks danny for the info