Hi Rudi,
for the new Cockpit SX you need the Copilot Module.
Copilot
For the older Transmitters you need a 2.4 Transmitter Extension Module, which is not more in Sale at MPX. You have to look at different posibilities.
a) Ebay
b) RC Network
c) RC Line
D....
E RC Equipmet Sales
like this one
HFMx Module
BR Dieter
