In terms I understand, single conversion means the incoming signal is filtered for “noise” one time before going the rest of the way through the receiver and dual conversion means it is filtered twice. That may not be technically correct but it means more to me than KHZ numbers.

Hitec & Futaba micro receivers for limited range park flyers are single conversion. Their full range receivers are dual conversion. I’m guessing it takes more parts (weight) to do dual conversion and they don’t do it for the stuff that has to be super light.

From what I’ve read, all JR receivers are single conversion; and they use some other technology to deal with “noise.”

Since Futaba & JR are both widely used all over the world, in big and expensive planes, I’m not sure that either method is “better” than the other.