Abstract: A method of operating a system (1) having a first controller (2) to which a second controller (3) is connected, wherein the first controller (2) is connected via a data link (4) to the second controller (2) and exchanges data therebetween, and the first controller (2) is connected to the second controller (3) via a power link (5) and supplies the second controller (3) with power from a power source (7), characterized in that a sensor (8) of the first controller (2) is used to measure the current flow via the power link, and that the current flow is influenced by means of a load (13) of the second controller (3) for the purpose of data transmission between the two controllers (2 and 3) via the power link (5).

Abstract: A method of operating a system (1) having a first controller (2) to which a second controller (3) is connected, wherein the first controller (2) is connected via a data link (4) to the second controller (2) and exchanges data therebetween, and the first controller (2) is connected to the second controller (3) via a power link (5) and supplies the second controller (3) with power from a power source (7), characterized in that a sensor (8) of the first controller (2) is used to measure the current flow via the power link, and that the current flow is influenced by means of a load (13) of the second controller (3) for the purpose of data transmission between the two controllers (2 and 3) via the power link (5).

Abstract: A method for receiving high frequency signals, wherein several receiver antennas receive said signals and transmit the signals of one antenna to a receiver, representing a selectable program content. It is possible to select at least one other antenna which received signals with the same program content but with better signal properties. According to the invention, the signals received by at least one antenna are examined for the data content thereof and it is possible to switch from one signal received by an antenna to another signal received by an antenna if the data content of one signal corresponds to the data content of the other signal or if, when the signals received by at least two antennas are examined for the data content thereof, it is possible to switch to another signal received by another antenna if the data content of the signal that is received by one antenna corresponds to the content of the other signal received by another antenna.