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  • 1
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    The Pokiok batholith: a contaminated Acadian intrusion with an anomalous Rb/Sr age (1981)
    Canadian Science Publishing
    Details
    Publication Date: 1981-05-01
    Print ISSN: 0008-4077
    Electronic ISSN: 1480-3313
    Topics: Geosciences
    Published by Canadian Science Publishing
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    PAPER CURRENT
  • 2
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    Wide-band receiver system development - Wide- band power multiplier (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Circuit description and performance characteristics of frequency multiplier in wideband communications receiver system
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A transmission line phase stabilizer (1979)
    In:  CASI
    Details
    Publication Date: 2006-06-01
    Description: To meet the phase stability requirements of certain experiments performed with the Deep Space Network, transmission lines carrying reference signals must be stabilized to reduce changes in their electrical length due to mechanical movement or changes in ambient temperature. A transmission line phase stabilizer being developed at JPL to perform this function is described.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: The Deep Space Network; p 67-71
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A 100-kHz frequency divider, distribution amplifier (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: A frequency divider, distribution amplifier module having low phase noise and low phase drift with temperature and high isolation between outputs was developed for use in the hydrogen maser frequency standard, where it divides 1 MHz from the previous frequency divider down to 100 kHz and provides four transistor-transistor logic (TTL) outputs.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: The Deep Space Network; p 102-104
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Performance of a 12-GHz fiber-optic system for beam-waveguide antenna stability testing (1992)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: A 12-GHz fiber-optic system is a critical part of a test configuration that was proposed for measuring the fractional frequency stability of the DSS-13 beamwaveguide (BWG) antenna. This fiber-optic system is used to carry Ku-band (12 GHz) signals from a reference antenna to the DSS-13 BWG pedestal room. Tests performed only on the fiber-optic system portion of the overall test configuration showed that the 12-GHz fiber-optic system (installed at DSS-13) has a frequency stability of about 1.1(10)(exp -16) for sampling time tau = 1000 sec for a nighttime run. This preliminary result establishes the lowest noise floor that can probably be achieved for the test configuration that will be used to measure the frequency stability of the DSS-13 BWG antenna.
    Keywords: OPTICS
    Type: The Telecommunications and Data Acquisition Report; p 105-113
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A high-speed photonic clock and carrier regenerator (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As data communications rates climb toward 10 Gbits/s, clock recovery and synchronization become more difficult, if not impossible, using conventional electronic circuits. The high-speed photonic clock regenerator described in this article may be more suitable for such use. This photonic regenerator is based on a previously reported photonic oscillator capable of fast acquisition and synchronization. With both electrical and optical clock inputs and outputs, the device is easily interfaced with fiber-optic systems. The recovered electrical clock can be used locally and the optical clock can be used anywhere within a several kilometer radius of the clock/carrier regenerator.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Telecommunications and Data Acquisition Report; p 202-210
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    State-of-the-art fiber optics for short distance frequency reference distribution (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A number of recently developed fiber-optic components that hold the promise of unprecedented stability for passively stabilized frequency distribution links are characterized. These components include a fiber-optic transmitter, an optical isolator, and a new type of fiber-optic cable. A novel laser transmitter exhibits extremely low sensitivity to intensity and polarization changes of reflected light due to cable flexure. This virtually eliminates one of the shortcomings in previous laser transmitters. A high-isolation, low-loss optical isolator has been developed which also virtually eliminates laser sensitivity to changes in intensity and polarization of reflected light. A newly developed fiber has been tested. This fiber has a thermal coefficient of delay of less than 0.5 parts per million per deg C, nearly 20 times lower than the best coaxial hardline cable and 10 times lower than any previous fiber-optic cable. These components are highly suitable for distribution systems with short extent, such as within a Deep Space Communications Complex. Here, these new components are described and the test results presented.
    Keywords: OPTICS
    Type: The Telecommunications and Data Acquisition Report; p 81-87
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Stabilized fiber-optic frequency distribution system (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A technique for stabilizing reference frequencies transmitted over fiber-optic cable in a frequency distribution system is discussed. The distribution system utilizes fiber-optic cable as the transmission medium to distribute precise reference signals from a frequency standard to remote users. The stability goal of the distribution system is to transmit a 100-MHz signal over a 22-km fiber-optic cable and maintain a stability of 1 part in 10(17) for 1000-second averaging times. Active stabilization of the link is required to reduce phase variations produced by environmental effects, and is achieved by transmitting the reference signal from the frequency standard to the remote unit and then reflecting back to the reference unit over the same optical fiber. By comparing the phase of the transmitted and reflected signals at the reference unit, phase variations of the remote signal can be measured. An error voltage derived from the phase difference between the two signals is used to add correction phase.
    Keywords: OPTICS
    Type: The Telecommunications and Data Acquisition Report; p 88-97
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Microwave analog fiber-optic link for use in the deep space network (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A novel fiber-optic system with dynamic range of up to 150 dB-Hz for transmission of microwave analog signals is described. The design, analysis, and laboratory evaluations of this system are reported, and potential applications in the NASA/JPL Deep Space Network are discussed.
    Keywords: OPTICS
    Type: The Telecommunications and Data Acquisition Report; p 21-33
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A high-performance single-mode fiber-optic isolator assembly (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A high-isolation single-mode fiber optic isolator assembly was designed and fabricated. The measured forward loss is 2.6 dB and the reverse loss (isolation) is greater than 70 dB. This is a 30-dB higher isolation than the isolation of the best fiber optic isolator previously reported. This isolator provides isolation between the semiconductor laser diode and the optical fiber in a precise reference frequency transmission system. The isolation of the laser greatly reduces the system's sensitivity to microphonics.
    Keywords: OPTICS
    Type: The Telecommunications and Data Acquisition Report; p 8-11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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