"Test" signal

I was wondering if it is possible to mix a channel that would continuously go from 0 to 100% over a few seconds, then reverse ?
The goal would be to do some range testing, let the tx sit somewhere - go far with the receiver and a servo moving.

The only way I thought would be with the addition of an arduino on the ppm input. is it possible in mixing ?

(sorry for the frenglish)

Wow, ok if this works, I'm happy.

But... can someone explain this black magic ?
Nobody answered people in that thread that asked for clarification.

I'm really happy with deviation, all my quads work well with the same tx. Thanks ! Sadly, the mix interface is not intuitive at all, to me.

You can try running on the emulator and figure out how it works.

There's an explanation somewhere in the forum, maybe in another thread for something similar. It relies on the fact that mixers are evaluated and updated in order, only once, at regular time intervals. So evaluate it top to bottom (though there may be some details in ordering - haven't studied the code) just once, and that's the first set of output values. Those values are used in the next evaluation of the mixers to produce a new output. And so on.