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  • 1
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    Unknown
    On improved ranging (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The use of a 1 MHz range code and a narrow-passband IF filter reduces waveform distortion error by a factor of as much as 20. Along with this improvement in ranging precision, ranging accuracy is enhanced by nullifying many errors caused by equipment vagaries. The IF filter and concomitant modification of ranging system software (and in the case of the planetary ranging assembly, hardware) are the most cost-effective way of improving the current generation ranging system.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 40-44
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    X-Ray Inspection of Transistors (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Component holder speeds examination of matched pairs. Transistors are oriented for two perpendicular x-ray views. Second view obtained by simply flipping block around corner near components, while corner remains in contact with film. Procedure allows inspection of up to 50 pairs - two views of each pair - on single x-ray film in same time previously required for 1 unmounted pair.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15675 , NASA Tech Briefs (ISSN 0145-319X); 7; 4; P. 466
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Automatic acquisition and ranging system (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Digital circuitry automatically demodulates received radio-frequency ranging signals for phase comparison with transmitted signal. All digital circuitry makes system more stable than analog predecessor and makes automatic operation easier and simpler.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-13982 , NASA Tech Briefs (ISSN 0145-319X); 3; 3; P. 335
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Tone-activated, remote, alert communication system (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Pocket sized transmitter, frequency modulated by crystal derived tones, with integral loop antenna provides police with easy operating alert signal communicator which uses patrol car radio to relay signal. Communication channels are time shared by several patrol units.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-11132
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Digital demodulator-correlator (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An apparatus for demodulation and correlation of a code modulated 10 MHz signal is presented. The apparatus is comprised of a sample and hold analog-to-digital converter synchronized by a frequency coherent 40 MHz pulse to obtain four evenly spaced samples of each of the signal. Each sample is added or subtracted to or from one of four accumulators to or from the separate sums. The correlation functions are then computed. As a further feature of the invention, multipliers are each multiplied by a squarewave chopper signal having a period that is long relative to the period of the received signal to foreclose contamination of the received signal by leakage from either of the other two terms of the multipliers.
    Keywords: COMMUNICATIONS AND RADAR
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Measuring Tension in Transistor Suspensions (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Vibration analyis is nondestructive and noninvasive. Transistor isolated from heat (or cold) of surroundings by filament suspension. Filaments made of polyester are (0.005 in) 0.127 mm in diameter. Transistor lead wires are wrapped around certain filaments. Applicable for testing filament mounts too delicate for testing by tension probes.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-15677 , NASA Tech Briefs (ISSN 0145-319X); 7; 4; P. 372
    Format: text
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    NASA TECHNICAL REPORTS
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