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The primary function of the Signal Data Converter (SDC) is to accept radar and navigation signals and multiplex them into one RADDS (Radar Data Distribution System) Data Stream. This process is crucial because it allows for the integration of multiple signal types into a single coherent stream that can be utilized for further processing and analysis within the ship's combat system. By effectively combining these signals, the SDC facilitates the efficient transmission and dissemination of critical information, improving situational awareness and decision-making capabilities for operators.

This functionality is essential in modern naval operations, where systems need to work seamlessly together to ensure that data from various sensors is available for real-time analysis. The multiplexing capability of the SDC helps streamline the handling of multiple inputs, making it easier for combat systems to interpret and respond to complex scenarios encountered at sea.