Hello, I have purchased my Phantom 2, Vision + in USA and it is factory set for FCC compliance which is supposed to have an effective range of 800 meters (according to instruction manual, page 27). I am using it in Europe, Croatia, I get an effective range of 400 meters, which corresponds with CE (European) compliance. I haven't changed any setting since I have purcshased it and I presume that effective range should be as set, 800 meters. I would like to use additional 400 meters range bit I do not want to fiddle with Assistant Software. Do I need to turn potentiometer knob (figure 28) to full clockwise turn to achieve FCC Compliance?