EVALUATION OF ATCBI DECODER MODIFICATIONS.
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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A set of prototype modifications to the decoders of Air Traffic Control Radar Beacon Ground Station, Types ATCBI-2 and ATCBI-3, were evaluated to ensure validity of the design of the modifications as a basis for a product specification. The modifications were designed primarily to detect and process emergency code 7700 replies, communication-failure code 7600 replies, and four-train military emergency replies. Performance of the modified decoders was observed in order to support estimates of the ability to decode properly a valid emergency reply, communication-failure reply, or four-train emergency reply, occurring in a live operational environment. False alarm rates were investigated under various operating conditions. It was concluded that the basic design of the modifications was valid and, with certain improvements could serve as the basis for a product specification. It was recommended that the basic design be adopted as the basis for the product specification and the modifications be implemented by means of field modification kits. It was also recommended that final acceptance and implementation in the field be contingent upon a practical demonstration that the alignment procedures, supplied with the production modifications, are satisfactory.