I picked up a Spektrum DX3-C cheap, and just got the ground receiver and hooked it up to my 2WD antweight pushybot. But I'm having trouble with the mixing. For RC cars, channel 1 is throttle, channel 2 is a steering servo. I've mixed channel 2 to mirror channel 1, and can drive forward and backward, but "turning" is one wheel only. (So, it can't turn in one direction at full speed, etc.)
Has anyone used a throttle-and-wheel transmitter, and can advise?