Accession Number : AD0462045


Title :   NETWORK, HYBRID BRANCHING TA-618(XW-1)/FCC-17 AND TA-640(XW-1)/FCC-17 THROUGH TA-644(XW-1)/FCC-17. VOLUME 1.


Descriptive Note : Technical rept. on Phase A,


Corporate Author : LENKURT ELECTRIC CO INC SAN CARLOS CA


Personal Author(s) : Easley, Forrest N ; Holmes, Terry R


Report Date : 30 Oct 1964


Pagination or Media Count : 29


Abstract : This Phase A Technical Report contains a chronological summary of the design and development problems and a detailed theoretical discussion of the hybrid branching network. The hybrid branching network was designed and developed for insertion in a radio baseband to allow supergroups or groups of vf channels to be dropped from the baseband and be routed to multiplex terminal equipment. The remainder of the vf channels remain in the baseband as through channels. Any channels dropped may be replaced by new channels covering the same frequency range. The major design problems were encountered in designing the highpass filters. Difficulty was encountered in designing a highpass filter circuit that would operate within specified limits at 108 kc and 156 kc with an extremely narrow transition interval between the stopband and the passband. This problem was solved by inserting a Q multiplier in the highpass filter circuit. The predicted Mean-Time-Between-Failure (MTBF) of each hybrid branching network is 7700 hours and the Point Availability (PA) is 99.9967 percent. (Author)


Descriptors :   *RADIO EQUIPMENT , SWITCHING CIRCUITS , MULTIPLEXING , MULTIPLEXING , HIGH PASS FILTERS , LOW FREQUENCY , FREQUENCY MULTIPLIERS , RELIABILITY(ELECTRONICS) , ENGINEERING DRAWINGS


Distribution Statement : APPROVED FOR PUBLIC RELEASE