As promised I made a small mod to the PCB took the worst possible cable to connect the last module to RX and have it running on my desk now. Until now I don’t see any problems. But as mentioned before I did not before while using very short cables. I used the first MOSFET I could find BSS138SS but you can also use for example the AO3400A used at the modules to switch on and off the dump_load.
