T-Rex 250 Pro DFC – See the owners manual for 3GX setup. Model Type: HELI Spektrum DX7: Normal Mode, Stunt Mode 1, Stunt Mode 2. Set pitch curve.Spektrum's DX7 is the first-ever full range 2.4GHz Spread Spectrum Radio system for RC programming to the matching model memory.RC Helicopter Beginners Forum - Trex 450 DFC Radio Setup - DX7 This is for a Trex 450 pro dfc, flybarless (3gx gyro) kit. the trex manual, method 1, page 21), I've also included an attached picture of the wiring closeup).Jun 2, 2011 SPEKTRUM DX7s • RADIO INSTRUCTION MANUAL. EN assembly, setup or use, in order to operate correctly and avoid damage or serious .