I purchased the PXFmini a few weeks ago and hooked it up ready for my first flight test but none of the four motors have been spinning at all. That is my main issue. I suspect there could be an issue with PXFmini board because:
I measured that the PPM signal input go to channel 9 on the board correctly as shown on my oscilloscope. The output channels (1 to 4) from the PXFmini to the ESCs are periodically output (about 400Hz PWM signal) pulse width of 1 millisecond. The PXFmin never change the output of PWM signal (it alway stays at 1 msec).
If I removed the PXFmini from the ESCs and used a servo-tester, I was able to calibrate and the motors were spinning and the pulse width varied between 1 to 2 msec. At 2 msec PWM, the motors are at maximum speed. I don't see the same behavior when I tried the same calibration with the PXFmini in the loop.
You can see more of the details on the video https://youtu.be/a06EXMRUimk