I have a 9C and have my models flying PCM with PCM receivers.
If I switch to 2.4 do I have to change the settings to to PPM and do I lose the airplane setups? Or do the say as is?

Thanks
Mike

I have a 9-c  great radio, any ways I changed to 2.4 modual and receiver and did not have to change any setting and go fly....

If you install the FASST module in your 9C transmitter, you change it to PPM mode, and install the model. It will not reset any of your model's other settings.