From one of JohnC's posts: 1. You can connect a spektrum satellite and sbus/ppm receiver simultaneously to the radian. The Spektrum data is used over the others - so if your single operator radio comes in on SBUS or PPM and the second operator comes in on Spektrum then it will work as single-operator until you turn on the Spektrum when it becomes dual operator. The Radian even swaps around the PPM/SBUS/Spektrum channels so they will match as you go between them. For example, the aileron stick is the same selection numder for slew even though the radios are different (well, at least with the receivers I tried). The 'Input Channel Monitor' will show you what is going on as you switch between operators.