I got a Berg 4L for the trainer. Part of the mission of this plane is to work on a buddy box for the kids.
Well, one of the features of the Berg 4L is that it characterizes the transmitter that it's supposed to listen to on start up, and after that it ignores other transmitters. It does this by picking out details of the transmitter's frame rate and other timings.
So guess what! With a JR buddy box, it doesn't work! The buddy box system is completely analog -- switching to the buddy box just uses the "master" transmitter's RF deck and antenna with the buddy box's encoders (and frame rate, and timing). So when I switch to the buddy box, the receiver says "Hmm, transmitter changed, I'd better ignore that".
Everything works fine on the receiver that's embedded in my _other_ plane.
So I guess I have to move things around now, or see if the Berg has a "buddy box" setting.
I'm not sure if I should be frustrated that it doesn't do what I want, or pleased that it's so high tech.