As I recall, "old" Airtronics radio systems have the servo (not server) wires set up differently from Hitec, JR or Futaba.

If you're using old Airtronics servos, the system will probably not work.

Hitec, JR and Futaba servos have the servo wires arranged at the plug as follows:

Black on one side (ground), Red in the middle (Battery Positive) and white, yellow or orange on the other side (receiver signal.

Older Airtronics are definitely different. Airtronics experts, Please jump in here.