PKH, the problem comes with the different manufacturers using positive where others use negative and vice versa.  Since there is no connection with the various manufacturers, we have to live with the differences.  </p>

I won't say most, because there are some that are very specific about what radio they will use... only Futaba, only Hitec, only Airtronics, only Spektrum, and so on.. so they get their expo polarity, use it and that's that.  Most don't even care if it's negative or positive, only that they put it in, it works, and that's the end of that game.</p>

But, when modelers mix, well, the confusion is evident and the only answer is to experiment using low numbers (if flying) or do as I suggested earlier.. put a lot in, remain on the ground, deflect the control surface, and see what happens.  If it isn't what you expected, then use the opposite polarity and check it again.  Hopefully, all will be ok after the re-check and you're ready to go.</p>

CGr.</p>