ORIGINAL: aeajr
If you are flying on 50 and don't run into conflicts, then you dont' really need the synth module. The synth adds about 50% to your battery drain, so you will have shorter battery life with the synth module.
Hmmm. I would dispute that. I just bought a new 9CAPS system with the FSS sythesized TX module and the R319DPS RX. I charged the supplied 700mAH TX pack for 16 hours for it's forming charge. I turned on the TX and let it run until it started beeping a low battery warning.
It ran 2.75 hours. Not bad for a NiCD pack which is still probably not optimized yet. I don't yet have an RX pack but will likely go with a 1600+mAH NiMH or better since this system will be used in a 7 servo UltraSport 40.