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The electrical characteristics of the “Telstar” conical horn-reflector antenna
70
ABSTRACTS ON MICROELECTRONICS AND RELIABILITY
Cincinnati, Ohio (May 1962). Presents a procedure, together with n_ece~__ry tables of products, for applying the MIL-STD-105B plans to acceptance sampling inspection when the quality of items in the lot is evaluated in terms of the instantaneous failure rate or hazard rate as a function of time. A model for the reliability estimation of space systems. W. WOLM~, LE.E.E. Trans. Retiab. (formerly LR.E. Tram. Reliab. Qual: Control) It-12, 32-39 (Mar. 1963). The general problem and need for reliability estimation and prediction is discussed. Various types of reGab/l/ty estimates are considered. A general prohabilistic model is defined in a set-theoretic framework. The model considers the operation of a system over several time-periods where the operating mode of the system may change from period to period. A general expression is given for the reliability of a system and also upper and lower bounds. Several theoretical examples are shown by using the model and it is shown how particular applications y/eld different results depending on the physical situation considered. In addition brief mention is made of a particular rel;ability study, namely a certain phase of the 3-orbit minion of Project Mercury. Pre-latmch calculation of s p a c e s y s t e m reliability. V. L. GRoss, .7. Environmental $c/., p. 12 (June 1%3). This paper discusses a number of factors which must be known before realistic calculation of systems reliability can be made. Certain of these factors are known today, while others are unavailable. When edl contributing factors can be determined, it will become possible to make pre-launch calculations. The mechanical design of the "Telstar" horn-reflector antenna and redome. J. C. DOLLXNO, 11. W. Br~cg_MOt~, W. J. KXNV~XMA~ and K. B. WOODW~, Bell Syst. Tech. jT. XIM, 1137 (July 1963). This paper describes the mechanical design of the horn-reflector antenna and the associated radome. The mechanical considerations dictating the final configuration of the antenna structure are discussed, along with the engineering aspects of the design, fabrication, and erection of the structure. The mechanical features of the data take-off and antenna drive systems are given in detail. The final section presents an account of the requirements, manufacture and installation of the radome and its accessory equipment. The electrical characteristics of the "Telstar" conical horn-reflector antenna. J. N. HINEs, TxNCY~ Lx and R. H. TURIN, Bell Syst. Tech. J. XIM, 1187 (July 1%3). The conical horn-reflector antenna was selected for the satellite communication ground station because of its broad-band and low-noise properties. Prior to the construction of the full-size antenna, theoretical and model studies of its electrical characteristics were undertaken. These studies consisted of computing gain and radiation patterns for two modes of excitation, constructing model antennas and measuring them. Results of these studies are presented in this paper together with results of the measurements of the full-size antenna at Andover, Maine. The computer reliability report. I. R. W H I T ~ , Proc. 9th Nat. Syrup. on Reliab. and QuaL Control, pp. 80-83, San Francisco, Califorma (Jan. 1963). Discusses the advantages of using computers in reliability reporting. The major factors involved in using computers in comprehensive reliabifity efforts are presented. Among the topics discussed are: computer speeds, input data format and accuracy, pre-programmed report requirements, sources of data, methods of analysis, format and purpose of reports, and data coding. The need for maintaining "clean" data is stressed in terms of efficient utilization of computers in reliability activities. Redtmdant semiconductor switchlnH circuits. K. L. HALL, eroc. Mid-Amer. Electron. Conf., Kansas City, Missouri (Nov. 19-20, 1%2). Demonstrates the feasibility of improving the reliability of semiconductor switching circuits by the use of redundancy techniques, considers the standard switching circuits (i.e. inverters, buffers, and muitivibrators) and shows how component redundancy may be used to improve their reliability. A number of such designs are given. A brief, qualitative treatment of system redundancy is also presented. A circuit packaging model for high-speed computer technology. F. K. Bum.ow, F. B. HAlleCk, E. L. WlLt~J~,e and J. J. Z~lo, IBMJ., p. 182 (July 1963). An exploratory model has been constructed in a study of packaging and circuit techniques for a high-speed computer technology. An Arithmetic and Logic Unit capable of processing 64-bit words in floating-point format was fully designed. From
ABSTRACTS ON MICROELECTRONICS AND RELIABILITY
Cincinnati, Ohio (May 1962). Presents a procedure, together with n_ece~__ry tables of products, for applying the MIL-STD-105B plans to acceptance sampling inspection when the quality of items in the lot is evaluated in terms of the instantaneous failure rate or hazard rate as a function of time. A model for the reliability estimation of space systems. W. WOLM~, LE.E.E. Trans. Retiab. (formerly LR.E. Tram. Reliab. Qual: Control) It-12, 32-39 (Mar. 1963). The general problem and need for reliability estimation and prediction is discussed. Various types of reGab/l/ty estimates are considered. A general prohabilistic model is defined in a set-theoretic framework. The model considers the operation of a system over several time-periods where the operating mode of the system may change from period to period. A general expression is given for the reliability of a system and also upper and lower bounds. Several theoretical examples are shown by using the model and it is shown how particular applications y/eld different results depending on the physical situation considered. In addition brief mention is made of a particular rel;ability study, namely a certain phase of the 3-orbit minion of Project Mercury. Pre-latmch calculation of s p a c e s y s t e m reliability. V. L. GRoss, .7. Environmental $c/., p. 12 (June 1%3). This paper discusses a number of factors which must be known before realistic calculation of systems reliability can be made. Certain of these factors are known today, while others are unavailable. When edl contributing factors can be determined, it will become possible to make pre-launch calculations. The mechanical design of the "Telstar" horn-reflector antenna and redome. J. C. DOLLXNO, 11. W. Br~cg_MOt~, W. J. KXNV~XMA~ and K. B. WOODW~, Bell Syst. Tech. jT. XIM, 1137 (July 1963). This paper describes the mechanical design of the horn-reflector antenna and the associated radome. The mechanical considerations dictating the final configuration of the antenna structure are discussed, along with the engineering aspects of the design, fabrication, and erection of the structure. The mechanical features of the data take-off and antenna drive systems are given in detail. The final section presents an account of the requirements, manufacture and installation of the radome and its accessory equipment. The electrical characteristics of the "Telstar" conical horn-reflector antenna. J. N. HINEs, TxNCY~ Lx and R. H. TURIN, Bell Syst. Tech. J. XIM, 1187 (July 1%3). The conical horn-reflector antenna was selected for the satellite communication ground station because of its broad-band and low-noise properties. Prior to the construction of the full-size antenna, theoretical and model studies of its electrical characteristics were undertaken. These studies consisted of computing gain and radiation patterns for two modes of excitation, constructing model antennas and measuring them. Results of these studies are presented in this paper together with results of the measurements of the full-size antenna at Andover, Maine. The computer reliability report. I. R. W H I T ~ , Proc. 9th Nat. Syrup. on Reliab. and QuaL Control, pp. 80-83, San Francisco, Califorma (Jan. 1963). Discusses the advantages of using computers in reliability reporting. The major factors involved in using computers in comprehensive reliabifity efforts are presented. Among the topics discussed are: computer speeds, input data format and accuracy, pre-programmed report requirements, sources of data, methods of analysis, format and purpose of reports, and data coding. The need for maintaining "clean" data is stressed in terms of efficient utilization of computers in reliability activities. Redtmdant semiconductor switchlnH circuits. K. L. HALL, eroc. Mid-Amer. Electron. Conf., Kansas City, Missouri (Nov. 19-20, 1%2). Demonstrates the feasibility of improving the reliability of semiconductor switching circuits by the use of redundancy techniques, considers the standard switching circuits (i.e. inverters, buffers, and muitivibrators) and shows how component redundancy may be used to improve their reliability. A number of such designs are given. A brief, qualitative treatment of system redundancy is also presented. A circuit packaging model for high-speed computer technology. F. K. Bum.ow, F. B. HAlleCk, E. L. WlLt~J~,e and J. J. Z~lo, IBMJ., p. 182 (July 1963). An exploratory model has been constructed in a study of packaging and circuit techniques for a high-speed computer technology. An Arithmetic and Logic Unit capable of processing 64-bit words in floating-point format was fully designed. From