I have been using the HFS 04MI rx with an older JR (FM) set. I am now using it with my JR X378. Is this rx compatable with my x378. I have not experienced any problems but it has been suggested that it is not safe to do so. My son in law has been using the same rx with his Futaba Skysport 6 and FF8 and has had no problems.

I also have 4 Hitec feather rx's for use with my school club but the 1 rx I have tried is having problems with both futaba and JR tx's.

If its a shift problem can either of these types of rx be switched?