Hey everyone,

I have a T-Rex 450 pro and have just changed the receiver from a spektrum AR6100 to a AR7000. I have bound it to my DX7 as normal. All is good and bound but it has changed all the trim on my cyclics? My swashplate is no longer lever and will need to be trimed out again!

Is this normal? I wouldn't have thought changing receivers would do that?
If not the receiver is there something else they may have triggered this?

Normal. Nothing is exactly the same.

Anyone else?

Is there a reason or just one if those things? I'm a little confused as to why it would do it?

Normal. Nothing is exactly the same.

You'll also find that no two servos center the same if you swap them out.

So if you change the receiver it will change the servo centre points?? I don't understant how this happens? Why would changing the receiver and not touching servos or tx change their centre points?

The receiver receives a signal that has a modulated pulse train on a carrier wave. Wait do I have to explain what that is too??? Anyway this pulse train consists of a signal pulse to start the information then a pulse to tell the receiver where each servo is centered at. Then the receiver gets this information and decodes it and then sends it to each servo. This is were clock frequency, decoding and other things can be different. All it takes is a little difference in a RCL cicuit and a pulse can be just a tad later than it's supposed to be, these are very short distances and you will notice on the servo a very tiny change in pulse decoding. You'd have to see all this on an oscilloscope for it to make sense.

Short answer: electronics vary. No two components are exactly the same. For example, one 2.2k ohm resistor might actually be 2.22k ohms and another 2k ohm resistor might actually be 1.18K ohms. That's one of the reasons TX's have trims.