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This report documents the implementation of some old and new techniques to the problem of command-and-control signaling within a Category III instrument landing system. The old techniques include the use of tone signaling over balanced lines, along with isolation transformers and gas-discharge elements for lightning protection. The new methods include the application of microprocessor control devices to supervise, format, and interpret all communications. Additional features afforded by the microprocessor approach include automatic and manual maintenance logging at the control tower, more reliable transmission error detection, enhanced system status displays, and a self-contained operator training feature. (Author)