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This decoder accepts eight tone frequencies, from which it will produce twenty-one separate outputs. It meets all NASA requirements for address-execute command equipment.' The design and construction of the decoder will be discussed. Several circuit innovations will be described, including a solid state address switch with a slow release feature, a noise immune tone filter, and a novel d-c actuated memory element. Construction features include shock and vibration isolation for sustained operation in a highly adverse environment. Finally, the decoder is light and compact. Together with its companion receiver, the total weight is 2-1/ 2 pounds and the overall size is 43 cubic inches.