who can help for the installation of a rotor to the parable sat?

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I am having big difficulties in the installation of a rotor for the parable of the tv. I succeed in visualizing an only satellite the principal. The parable turns but of the others nothing. Before with the dual feed I clearly succeeded in viewing 2 satellites. Instead installed now the rotor alone one. Absurd Where am I wrong? The parable has a diameter of 1 meter.