To Synthesize or not to Synthesize

[rustnpede]

Originally Posted by Happywing

Spektrum's a good deal right now. They have some new stuff coming out, so the old stuff's going cheap. You should be able to get a new DX2 with 2 servos for under $150.00. Sell the servos if you don't need them and the whole thing will end up costing a little over $100.00...And no interference.

Sounds good. I was considering a Synthesized Futaba 3PM-FS Pro ($180) but since interference isnt much of an issue I had decided on a futaba 2pl for $85. The DX2 is sort of in the middle so maybe Ill pick up one of thouse.

Just wondering, has anybody used an AM system with a highpower brushless setup? How much interference did that take in?

[BrianG]

I haven't used an AM system with BL, but I'd imagine it's not a good idea. AM modulates the servo signal on the tops and bottoms of the RF carrier signal, which is the exact place where noise would affect. FM is better since the frequency of the carrier signal shifts in proportion to the servo signals. The radio actually chops the tops and bottoms of the noisy carrier signal which makes FM much cleaner. Typically, both AM and FM are analog modulated. Digital is even better as there is usually error checking involved, not to mention the carrrier frequency is higher and out of the range of just about every noise making device on a BL setup (UBEC, motors, etc).