Ok sorry if I came down hard, and I did miss that post, but someone sold you all this together as a beginner?..I can tell you from experience, your better off getting a tx on the bay or here in classifieds than sending yours off, I sent mine off to be changed and it cost me $105 with shipping (this was tower with a quote of a $50 fee and shipping, which did not include parts and labor, so I dont know what fee means to them?).....are you a beginner?...thats an awful lot of airplane/engine for a new guy....Rog
Ok I see you are getting a 7 channel tx now too...but forget the crystal numbers what you need to know is the channel...can you get us a pic of the tx's, the first one should only be 2-3 channel if it is ground or water use....