This paper discusses the performance of a practical PCM terminal for time‐division speech transmission. Limitations which make performance different from more conventional frequency‐division systems are considered. Particular emphasis is placed on limitations resulting from nonideal circuits and signal conditions. Both analytical and experimental results are presented with comparisons given where appropriate.
The Telstar spacecraft design is discussed with emphasis on the electronics system. The description includes early planning, starting with frequency allocation considerations, and carries the program through electrical and mechanical design, construction and evaluation of the electronics system. The content is aimed at a broad introduction, depending on companion papers for many details of the spacecraft design.
The electronics system of the Telstar satellite is described from the point of view of philosophy of design and construction rather than that of circuit details. The reliability is emphasized, and steps taken to preserve the inherent reliability of the components are discussed. The physical construction of modules, subsystems, and finally the entire system is described, including the foam encapsulation and the eventual hermetic sealing of the canister.
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