Two things:
1) Are there GPIO pins you are not using other than 18? If it is not in the section that you pointed me to in the defines.h file can i assume that I can try the transmitter data there?
2) There seems to have bee several changes to the P1 pinout for the new Raspberry Pi 2. There is a discussion HERE and a detailed explanation HERE. This is over my head, so I hope you can make sense of it. Could these be related to my issue?