The adjustment was surprisingly easy. To this end, I have to set the compass direction only a SAT-Finder app used by the receiver exactly towards Astra 19.2 East satellite to rotate. The tilt angle can be, thanks to the marked on the transducer bracket easy fix, as well as the elevation.
My receiver displays a signal quality of 97%, so I am more than satisfied.
Even in bad weather the reception is flawless. Once it has happened that muddy snow lay on the receiver and thus the reception has failed. With normal snow or rainfall, however, this has not happened yet.