The elevon mixer is used to allow two channel radio control gear to combine elevator and aileron movements for delta wing type planes. These planes have combined elevator and aileron surfaces known as elevons. Placing the combining function in the transmitter rather than the plane removes wiring complexity, weight, cost, power consumption from the plane. This design using analogue techniques also removes the quantising noise associated with many of the microprocessor based solutions. It also makes for an interesting construction project :-)
This design is specifically for the Hitech Ranger 2Z transmitter as it uses the reference voltage generated by the M5260P IC used in the Ranger 2 Tx for powering the LM324 and to derive the half rail voltage.

This information is shared with you on an as is basis. We accept no responsibility for any damage, loss or injury that may be caused in using this information.

Opening up your transmitter and modifying it is certain to void your warranty.

The Hitec Ranger 2Z Transmitter has a single sided PCB mounted inside a plastic case. The case has few spaces in which to add additional circuits. So to keep things small and simple I used a conventional DIP LM324 mounted on 0.1" copper strip board (vero board). Surface mount resistors and capacitors were used, these connect between the strips and track breaks.

Basic EMC principles need to be followed to prevent RF from upsetting the operation of the mixer. Fully enclose the mixer circuit in a metal can. De-couple the input, output and positive supply signals as close to the entry point to the can as possible. Connect 0v to the can. Make certain that the can cannot touch any of the conductive parts of the transmitter.

It is wise to test the mixer thoroughly before soldering it into the can. It may be possible to observe operation of the mixer outside the can with the aerial down.

Article by Richard Jones and reproduced with his permission
for Bumpy Green Model Aerodrome
September 2002