Hi mrasmm,

thank you for the suggestions. I just played a little more:

I think the receiver might be the problem. I only connected one ESC (to power the Rx) and one servo. I tried several ports for the servo. I could not link it to one stick movement. when moving one or both sticks in at least 2 axis, I could get the servo respond somehow.

one additional finding: it looks like the servo goes to its limit position all the time. the ESC was too hot to touch and also the servo became warm.

any suggestions?
or should I simply order an other Receiver?