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  • Other Sources  (3)
  • 1970-1974  (3)
  • 1960-1964
  • 1945-1949
  • 1910-1914
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  • 1
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    Decision-directed automatic gain control for MAPSK systems (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An automatic gain control (AGC) loop is presented for use with M-ary amplitude and phase shift keying (MAPSK) systems. The gain control amplifier is regulated by an error signal formed by the difference between the estimated amplitude level and the received amplitude level. The AGC performance is thus independent of the short-term average received signal energy. AGC loop analysis and simulation is presented for M-ary amplitude shift keying and quadrature amplitude shift keying. The AGC is shown to have a negligible degradation on the symbol probability of error for most practical cases. A generalized AGC for an arbitrary MAPSK system is presented.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: National Telecommunications Conference; Dec 02, 1974 - Dec 04, 1974; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radioisotope thermoelectric generator safety and operations considerations for users of large nuclear space power systems (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Radioisotope thermoelectric generator safety and operations considerations for users of large nuclear space power systems
    Keywords: NUCLEAR ENGINEERING
    Type: INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE; Aug 03, 1971 - Aug 05, 1971; BOSTON, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Power source considerations for Grand Tour missions. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: At the present time, there exists no known power source that will satisfy the power, weight, lifetime, and other stringent requirements of an extended outer-planet mission. Exploratory studies indicate the need for a solar-independent power source capable of supplying approximately 500 W of power over mission lifetimes of up to 12 years. The only known power source which can possibly meet these requirements, in the 1975 to 1979 time period, is a radioisotope thermoelectric generator (RTG). In 1969 a program began to develop a long-life, plutonium-fueled radioisotope thermoelectric power system. Aspects of spacecraft configuration are discussed together with power source requirements, RTG/spacecraft integration, operational details, and problems of safety.
    Keywords: AUXILIARY SYSTEMS
    Type: Intersociety Energy Conversion Engineering Conference; Energy 70; Sep 21, 1970 - Sep 25, 1970; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
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