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The block diagram shows a synchronizer or modulator unit synchronizes the operation of video processor-display unit and a transmitter by producing evenly spaced pulses. The transmitter supplies the pulses to an antenna through a duplexer. The antenna is also shared by a receiver through the duplexer. The receiver converts the signals delivered by the antenna and supplies them to videoprocessor-display unit. A servo unit controls the beam orientation of the antenna in response to the commands provided by an operator.