Are there different protocols for the same frequency? I may actually be wording that wrong, but, i have a FlySky FS-GT3B that says it has AFHDS, and i have 2 DHK Hobby receivers that say they are AFHDS, but, i can not seem to bind those two receivers to any radio i have. I don't have a DHK radio, since i got the receivers in a couple of cars i bought used, but, i need another receiver for a car i picked up that will work with my GT3B, so, i figured, since the DHK ones have the same protocol, why not use them if they will work, but they don't seem to, so, what is it i am missing here?