I had problems with the range on my FMA FS8 recievers. Their range limit seems to be 3/4 mile in the air compared to several miles for JR and Futaba recievers[:@] I have two FS8 units, so I know its not just a defective reciever... I have also read some other threads about limited range of the FS8 units. After some pretty extensive testing, I found that the range problem can be solved on the FS8 by adding a reciever preamp . The FS8 reciever just is not sensitive enough by itself and the range was much less than my JR reciever. After putting this preamp on my FS8 reciever (pictured below), the range was increased to almost exactly match what I could get with my JR.

Thinking that might get even more range from my JR, I put the same preamp on my JR reciever but that did increase its range at all. It appears that the JR reciever is sensitive enough already and the preamp just does not help it...

The only bad part to this whole thing is that the preamp requires 12 volts and is rather large [X(]... So that makes it hard to use this in most RC planes. Any suggestions on how I can increase the sensitivity of these FS8 receivers ??? Attached is a picture of my Preamp Solution....