What exactly is positive are negative shift. I have a JR XP7202 and I am looking for a receiver for a parkflyer foamie. I tried the Berg4L with my radio on channel 20 on the receiver and channel 20 on the radio and the receiver is not working. I don't know if I have a bad receiver are if the receiver does not work with my model radio. Has anyone used the berg with a JR XP7202 radio? JR radios are positive shift right? Positive/negative shift has nothing to do with the servos right? I have hitec servos on my Extra 260 foamie. I also messed up by getting the berg4l because I forgot about the throttle, so I need to get a 6 channel receiver, because I got 4 servos and esc. I was looking at the JR 610 sport, unless you'll have other suggestions.

Thanks, Mike