Gentlemen, I have conducted testing on the VEX transmitter... It will work, unmodified, with the Futaba R127DF 6 channel receiver. Moreover, the VEX receiver crystals work exactly as they're supposed to when you plug one into the Futaba receiver (for reference purposes, it's a double conversion receiver). I tested all six channels of the VEX transmitter with an S3003 servo, and it works as it should. This is very nice, as I got a great deal on 3 VEX transmitters and have some Futaba receivers laying around after their transmitter died.