Hi Dave,
In short no. The 12 2 decoder or any Robbe Futaba multiswitch / decoder's only work on 40MHZ.
The same as the Graupner Nautix stuff.
Dave did you get the proper Robbe conversion to 2.4Ghz as the Robbe futaba comes with a changover switch from 40MHZ to 2.4Ghz., so you just need a 40MHZ receiver?
Regards
Destroyer42