It was originally used to minimize the effects of gas engine ignition on the servos. It was widely used, and it didn't "do nothing." It often worked. It was also used to minimize outside effects, and for that it didn't "do nothing." It often worked for that as well.

And just about as often on both, it didn't.

Now, with the 2.4GhZ, RF noise problems have become relegated to being obscure, even rare problems. It takes something pretty "Messy" RF noise-wise to get past it. But in this world of a bajillion (technical term) electronic signals (many, MANY of them being 2.4 GhZ - even our remote home phones are now 2.4GhZ), there are enough to find their way in upon occasion.

~ Jim ~[8D]