RE: Radio 3rd channel question
hello if you look at the third channel control on your transmitter and its just a switch/toggle which has two posistions then you will only have either on or off if it is qiute a good transmitter you might be able to set end points for that channel but that is all. this type of (on/off) channel is common on aircraft radio systems because it can be used for the likes of the landing gear which you would only want either up or down nothing in between.
hope this helps
regards jordan