An experimental 24‐channel pulse code modulation system employing solid‐state devices is described. Economy of design and ability to operate over existing exchange cable were dominant factors in selection of system organization and circuit alternatives. System requirements are unique to this type of system. Design considerations in meeting these requirements are presented in brief here and in detail in companion articles.

This paper describes the electrical characteristics of the waveguide components, the solid‐state circuits and the traveling‐wave tube used in the microwave communications repeater. The reflex‐circuit method of obtaining local oscillator signals for the modulators and certain circuit stability problems are discussed.

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