I've seen this once or twice before and it's popped up again. I'm helping a guy who bought a Spektrum DX6i and he is connecting to the controller board through a Spektrum satellite receiver. When he tries to control the gimbal, the roll axis just rolls and rolls once the controller is turned on (it is bound). If we go to the monitoring tab, the neutral position is about 1000 us for the stick he's using on the radio. Even playing with the trim on the DX6i, the neutral position never gets higher than 1200 us or lower than 900 us. As many of you know, 1500 us should be the neutral position. I've never had much luck trying to fix anything this far off using RC sub-trim (and all of those values are currently set to zero).

Any ideas why this is so far off or how to fix it? I plan to try resetting the profile on the DX6i and see if that helps at all. Is there a way to verify that it's the radio that is having troubles and not the receiver or the controller board?