UPDATE June-3-2015: The X8R can also be hacked in a similar fashion: http://eleccelerator.com/frsky-x4rsb-sb ... omment-539 (img: http://imgur.com/S7R42nc)
- x4r-aq-direct.jpg (134.02 KiB) Viewed 40642 times
Works great, no changes in any channel values or any other weirdness vs. using an external inverter.
Note that it may be a good idea to place a ~330Ohm resistor on the S.Bus signal line (there's one in the original X4R circuit, after the inverter).
The holes are for .05" spaced pins (I think) but I used a JST-ZH (1.5mm, same as AQ RC header) connector which fit fine. 1.25mm should work also.
- Note that the M4 has a different pin order on the RC connector than the AQ v6 -- power and signal are switched!
Cheers,
-Max