I did some more testing and was finally able to also use ch11 by setting the FrLen to 25msec, but I still haven't been able to control ch12. I tried all FrLen settings from 22.5msec to 28msec, but I always only get 10 or 11 working channels. I have never been able to get ch12 to work.
Is this something that could be resolved through a TX/RX firmware update?
Originally Posted by chris1seto
One of the big issues with 12 channel PPM is that the PPM spec was never really meant to control 12 channels. If the channel readings are obtuse enough, you will overrun the PPM frame and cause the DL to failsafe. This is pretty much the same with any other device that reads PPM.
I'll do some testing later today, though the only reason why you wouldn't be able to use Ch11/12 is if you had an HT connected during binding.