Abstract: This invention is a signal coupler that works with, but is not restricted to multi-satellite, multi-receiver systems using one cable with a multi-slot transponder selector. The invention solves the difficulty of connecting a multi-output signal coupler to multiple receivers, where each receiver exhibits the characteristics of a master as specified by the DiSEqC protocol. By using a microcontroller with store and forward characteristics, it solves the issues of receiver command collisions, and is able to direct return commands (in DiSEqC 2.x systems) to only the receiver that initiated the communication.

Abstract: An antenna rotor system with a single cable including an antenna, a rotor unit and a control unit is disclosed. The antenna is mounted on the rotor unit for receiving radio signals to pass to the rotor unit. The control unit provides control signals and electrical power to control and drive the rotor unit for rotating the antenna. The single cable connected between the rotor unit and the control unit carries the radio signals, the control signals and the electrical power. Therefore, the installation of the antenna rotor system of the present invention is simpler, faster and lower cost.

Abstract: A multiplication circuit for use in an FM television transmitter and receiver is provided. The multiplication circuit includes a limiting circuit for limiting a subcarrier supplied thereto and a dividing circuit coupled to the limiting circuit and dividing the output of the limiting circuit by a predetermined factor. A mixer is coupled to the dividing circuit and mixes the output of the dividing circuit with the subcarrier.