Sorry for the slow response guys, I thought I was subscribed to this thread. In the future if someone needs some help with this library PM me if I don't respond fairly quickly.
m_marc0 - I have updated the library to no longer require SerialPort.h. It now uses the standard arduino conventions. The library is currently configured to run off of Serial1 on a mega. To change the edit the FUTABA_SBUS.h line 12
#define SBUS_SIGNAL_OK 0x00
#define SBUS_SIGNAL_LOST 0x01
#define SBUS_SIGNAL_FAILSAFE 0x03
#define BAUDRATE 100000
#define port Serial1 <---- this is the line to change
Tissy -I'm not quite clear on what you are trying to accomplish. You can create a PPM signal based off the different channels, but to what end? If you could describe your project in a little more detial hopefully I can give you a better answer. Also, are you sure you aren't confusing PPM with PWM?