Hi!
The question is: what Orange Rx?
The old GR300 is perfectly compatible with Spektrum radios: I have a few and they work perfectly with my DX3R.
The new GR300R however does not look to be compatible: I bought one at risk and have a lot of glitches, the car is almost undrivable.
..I was actually going to ask the forum if anyone knows what Tx is compatible with the GR300R.. non Orange, of course..