I think I have that model
Mine is just from Graupner/JR and is called xs6 race..
It's a nice radio, good range, nice feel, and it has all the features I can think of for rc-boating..
And it is light weight too.
The 3'rd channel is divided into 150 small "steps" in each direction.
I haven't figured out a way to boil it down, to like 10 (German instructions)
Not a big problem, I just get very precise needle controle.
Sofar the best radio I have had!!
But then again, I have only used Traxxas and Hitec befor.
Check out the prices on a loose reciever, and crystals, they are very steep from Graupner.
Morten