I have two Phantom 2 Visions and one of them I only get about 600' out of it the other which came with a different Phantom Vision I Get around 1200' out of it. I suspect that something is wrong with the first mentioned. I would like to pair the better one with the Phantom 2 Vision and check the range. Doing this will tell me if it is the Controller or Phantom. Is this possible to do and if so, how? Thanks in advance.