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  • ELECTRONICS  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • 1970-1974  (2)
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  • 1
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    Unknown
    Design, fabrication and testing of a 5-Hz acoustic exciter system (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A 5-Hz acoustic excitation system was designed, fabricated and checked out for use in the modulation of a stagnant gas volume contained in an absorption cell. A detailed system description of the test equipment, both mechanical and electronic, and an operating procedure are included. Conclusions are also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-124269 , T1046F
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Phase-lock demodulation of a PM signal contaminated with incidental AM (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Signals from phase-modulated satellite transmitters usually exhibit some degree of incidental amplitude modulation. The effects of incidental AM are analyzed when this type of signal is demodulated by a phase-lock receiver which does not employ a limiter preceding the loop phase detector. The presence of incidental AM causes a reduction in the receiver output signal-to-noise ratio. The tolerable level of AM decreases in proportion to the phase modulation index Beta. For a square-wave modulating signal, a 1 db reduction results at the receiver PM channel output when Beta = 1 radian and the percentage of AM = 23, Beta = 1.2 radians and the percentage of AM = 16, or Beta = 1.5 radians and the percentage of AM = 4. Although only the PM channel of the receiver is used ordinarily, utilizing both the AM and PM channel by summing offers an improvement in S/N relative to the S/N ratio of the PM channel if the percentage of incidental AM is greater than fifteen.
    Keywords: ELECTRONICS
    Type: NASA-TR-R-377 , G-1032
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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