AN/FCC-17 TYPE LOWER SIDEBAND MULTIPLEXER EQUIPMENT (EXPERIMENTAL).
Technical rept., phase A.
LENKURT ELECTRIC CO INC SAN CARLOS CALIF
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The report contains a summary of the design and evaluation efforts and a detailed theoretical discussion of the lower sideband ANFCC-17 channel multiplexing and associated equipment. This equipment was designed for use with existing ANFCC-17 or commercial multiplex systems, thereby increasing system flexibility, permiting end-to-end or group-interconnect operation with other multiplexer sets conforming to channel, group, and supergroup recommendations of CCITT. The equipment was designed to logically integrate with existing ANFCC-17 equipment without modification. External envelope delay is provided as an option only when phase equalization is required. The new equipment items were designed to meet ANFCC-17 idle noise, loaded noise, and channel harmonic distortion characteristics of MIL-M-27741. Only 2 major design problems were encountered and were related to the channel carrier generator 4-kc amplifier combining network. The first problem was in obtaining adequate paralleling action due to excessive coil resistance. The other problem was concerned with insufficient temperature compensation that caused variation in signal levels of frequencies between 64 and 108 kc at various ambient temperatures. Author
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