L5 system: Jumbogroup multiplex terminal

The juinbogroup multiplex (jmx) translates basic jumbogroup signals to and from the L5 line spectrum. Each of three jumbogroups provides 3600 4-kHz voice circuits. In addition to frequency translation, the jmx provides regulation and equalization on a jumbogroup basis and automatic one-for-one protection. Performance objectives are discussed and interpreted from the perspective of their influence on the design philosophy and approach used and the resultant physical realization. All subsystems are presented in detail. Particular mention is made of the double-balanced diode-ring modulator developed for jmx application.