Jstuma, if your airtronics is an AM you can just run the same crystal that your Ofna is running. Or you can pull the crystal out of the Cen transmitter and put it in the airtronics. That way, you don't have to swap all the radio gear. Right now, I am running a cheap airtronics that a friend of mine had with the Cen crystal and the Cen reciever. It works just fine and I have yet to have any type of run away or radio problem. How many times have you crashed the MT2?