(12-16-2021, 04:51 PM)XPS Wrote: If the frame rate is higher than 20ms or you trying to use more than 8 channels then that would cause an issue because PPM itself is limited to the number of sequential channels that will fit within each frame. The official specification for PPM use with R/C is 2.25us * number of channels + 4.5ms. That has to fit within your frame rate. So, 8 * 2.25 + 4.25 = 22.5ms, which is the standard frame rate used by Futaba, JR, and others. If you extend the frame rate you can add more channels. Graupner and Multiplex both do this to get more channels, at the expense of latency.
Ok, thanks for the interesting explanation. I couldn't get it to work with 8 channels on XJT-D16 or 8 channels with D8. I reckon I could make it work by having the transmitter talk to the XPS Tx module using PPM instead of XJT.
Thanks, have a great holiday season and take care,
Paul