Ken.. correct me if I am wrong, but isn't there a small problem of servo reversal with JR's and Spektrums when used with other receivers? If so, it's just a simple matter of reversing the servo action in the TX. It may be the same way for an Airtronics on the Spektrum if used as a replacement for a Spektrum, but I am not sure. I've never replaced one like that, but I do seem to recall that small... well, issue, it's not a problem just something to pay attention to if replacing one.

DS