RE: Futaba 9z saving freq and ppm-pcm settings
If it's not saving the pcm/ppm setting, you are definitely doing something wrong, as mine does save that setting. Remember: you have to cycle the power if you are going from one modulation to another, perhaps that's where the problem is coming in.
The frequency is a different matter. That is NOT saved, for various reasons that I won't go into here, but you have to set it if you want a different frequency.
HTH
Jim