INTERCONNECTING GROUPS OA-7021(XW-1)/FCC-17, OA-7151(XW-1)/FCC-17 AND OA-7152(XW-1)/FCC-17 (SUPERGROUP INTERCONNECT PANELS).
Technical rept., phase A,
LENKURT ELECTRIC CO INC SAN CARLOS CALIF
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A chronological summary is given of the design and development problems and a detailed theoretical discussion of the supergroup interconnect panel. The supergroup interconnect panel was designed and developed for insertion in the transmission path between the supergroup demultiplexer output of a given supergroup in the ANFCC17 terminal equipment and the supergroup multiplexer input of the same ANFCC-17 terminal equipment or of a given supergroup in a commercial L multiplex system. One supergroup interconnect panel must be used for each direction of transmission of a 60-channel supergroup. The major design problems were encountered in designing the bandpass and band elimination filters. Difficulty was encountered in obtaining ferrite coil cores that possess proper temperature coefficients and acceptably high Q characteristics and which remain stable within acceptable limits at all specified ambient temperatures. Difficulty was also encountered in manufacturing a crystal for use in the band elimination filter circuit. Additionally, all filter circuits had to be temperature compensated to further enhance stability at extremely high or low temperatures. Author