Used the WIKI to put up a second RS-System in the Nether. The Crafting Grid in the Nether is up and running and shows all my items and blocks which are stored into the system in the Overworld.

This means, the system is successfully set up with receiver, transmitter, network card, interdim upgrade and some chunk loaders in the Overworld as well as in the Nether.

In the Overworld, the wireless Crafting Grid works with unlimited range. In the Nether it tells "Controller not found". But there is no controller in the Nether. I crafted a new wireless crafting grid and tried to connect it to the receiver as the WIKI tells me to think of a receiver as of a controller. There's also an infinite wireles transmitter installed in the Nether.

I'm sure I'm missing something....

Ok I reconnected the wireless crafting grid another time and now it works everywhere as expected. Shame on me - it seems after the chunk loaders were installed and after the system was set up that the wireless crafting grid had lost connection in all worlds but I only checked the Nether . After the re-connect to the overworld controller everthing works out perfectly.