ORIGINAL: Longhair
I didn't mean to use the word "FASST" in my previous post.
Since the 3PKS uses a "Module/Receiver Set" it means that when the next step beyond 2.4GHz is taken, a new Module/Receiver will be needed instead of a new radio - that is if it is updated.
My 3PKS has the FAST 2.4 GHz already built-in, heres a cool video about Futaba's FASST 2.4GHz Spread Spectrum system and how it works.
http://2.4gigahertz.com/