I'm done with reading the Schulze and 3PKS Manual pfoe...
@T-Bro: I think you're right! In the 3PKS manual it idd says that some ESC's got problems with the HRS signal of the Futaba TX. The manual says this:
I need a two-way cord (same as an Y cord I guess?) and a DSC cord. But according to the picture, why would I need a Y cord, as I don't connect it to anything???