so let me see if i am starting to understand now lol lol jr 8103 comes in two different packages? the first is the fm/pcm and the second is pcm... please correct me if i am wrong pcm refers to only the reciever end of the system now i have the xp8103 fm/pcm which means i can either use a fm reciever or a pcm reciever and my radio is capable of both?the only difference is a pcm reciever yields a bigger price tag? on the module on my 8103 it says pcm with fm modulation.. i do have a fm reciever now but can use a pcm reciever if need be? thank you