for what to do two receivers? according to spectrum idea, it permits to receive two different signal on two frequency... but only two... because of the development of wi fi system for internet,it is not enough, and the spectrum have to reinit sometimes during the flight, in order to find another frequency.... you ll never know when it is going to happen, but it takes between 2 and 7 seconds... during this time, you are a spectator of your plane....
fasst changes frequency 500 times per second, and accepts the signal only if there is the dedicated code to your airplane with it.... so, many many times per second, the parasite signal of a wi fi sistem is ignored... and many many times per second, the signal from your radio is accepted.... you don t feel anything because it is too fasst for you... what can beat that for security?