I have a 7UAF I have used since new. Normally when I set up my airplanes if I need to reverse the throttle I would go to the REV menu and reverse channel 3 and everything worked fine. I had never used the TREV function.
I bought my first electric airplane and after installing everything I found the throttle and motor worked opposite. That is, full throttle, motor off. Low throttle setting, fast motor.
Naturally the first thing I did was go to the servo reverse. When I reversed channel 3 the motor would not work at all.
After an hour or so trying things, thinking it was the ESC, I put the servo reverse back like it was, the motor worked, but opposite the throttle setting. So I dug out my radio manual and found how to get to the TREV function and reversed the throttle there, now everything works right.

My question: What really is the difference between using servo reverse for the throttle and using TREV?
Does TREV affect the other three model settings? Will I have to go back and change them with servo reverse?



BTW, although I am planning on buying a new 9 CAFS soon, I am very pleased with this old 7UAF. It has been a good workhorse. I will keep in operation too.