Device for switching between linear and circular polarization using a rotatable depolarizer

A method of operating a system for receiving a signal from one or more satellites or for transmitting a signal to one or more satellites, the system comprising:

• a frame,
• a signal converter for converting between received radiation or radiation to be transmitted and a corresponding electrical signal, the converter being positioned, in relation to the frame, rotational around a predetermined axis,
• a depolarizer mounted, in relation to the frame, rotational around the predetermined axis,
• a single rotator for rotating the converter and the depolarizer,
• 1. the method comprising the sequence of steps of fixing the depolarizer in relation to the converter at a first predetermined rotational relationship,
• 2. rotating both the converter and the depolarizer within a predetermined angular interval,
• 3. rotating the converter and the depolarizer, in a first direction, past a rotational position where a first of the converter and the depolarizer engages a first end stop and stops rotating while the other of the converter and the depolarizer remains rotating,
• 4. Rotating, in the first direction, the other of the converter and the depolarizer independently of the first of the converter and the depolarizer to a second predetermined rotational relationship and
• 5. Rotating the converter and the depolarizer in a second direction opposite to the first direction, to a position where the first of the converter and the depolarizer engages a second end stop and stops rotating while the other of the converter and the depolarizer remains rotating,
• 6. Rotating the other of the converter and the depolarizer in the second direction, until the converter and the depolarizer is in the first predetermined rotational relationship.