ORIGINAL: Silversurfer
There are 3 excellent ways of setting up your split elevator without buying a new transmiter. Both JR and Futaba make a product for plugging up to 4 servos on one channel. JRs' is called the Matchbox. I don't know the name of the Futaba product. JRs' sells for around $70.00 each or 115 per pair. Both will let you reverse one or more servos from the matching unit. Both will let you PRECISELY match the center and end point positions of the servo. A very desirable condition. Both are small and light.
If you are using Hitec digital servos, you can purchase one of Hitecs' digital servo programmers and set both servos to the condition you wish them to be. You can also match the servo speed, center, and end points for perfect control harmony.
Those suggesting using a "Y" harness with a reversing function are setting you up for a lot of problems. It's also very old school thinking. Some of them are changes of control position as the reversing switch gets warmer. Inaccurate servo adjustment through the reversing pot, poor servo centering, and differences in servo speeds. All cause problems. Using the newer products using current technology will save you a lot of time and grief. It may cost you a little, but it may also save you more than you want to lose.
I agree with this post. I said that there were no satisfactory ways of doing the slipt elevator thing without the upgraded TX, but I forgot about the matchbox and the programmable Hitec's. Either of these would be a good solution. They both involve spending some money though, so you can do one of these two things, or you can put that money towards a new TX.
When using the reversing "Y"s or reversed servos (non-programmable), etc. There always seems to be some problems. Either you can't get the elevator throws to match up or the speed of each elevator is different or something.
Jim