i know that this is a stupid question but what is the differance between ems and mms. i just bought a used caliber 30 with all the servos removed. i have the manual but just not sure what the differance between ems and ms is. also should i use the sky sport 6 ans r127df reciever or get another reciever for my dx6i spectrum reciever would like to use the sky sport if possible but if the dx6i is a lot better i will get a reciever for it. If i use the dx6i do i have to get a spectrum reciever or do the other 2.4 ghz recievers work?

thanks
scott