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Radio and Electronic Engineer

Issue 7 • Date July 1972

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Displaying Results 1 - 11 of 11
  • The engineer's employment prospects

    Publication Year: 1972
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (135 KB)

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  • Applications of the josephson effects in the millimetre and submillimetre wavelength regions

    Publication Year: 1972, Page(s):303 - 308
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1066 KB)

    The Josephson effects, which arise at a suitable junction between two pieces of superconducting material, have several applications at millimetre and submillimetre wavelengths. Devices based on the effects can be used as video detectors, harmonic mixers and frequency analysers, often with unique properties. These and other possible applications are described, and the current experimental situation... View full abstract»

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  • Design considerations in the measurement of electron temperature in the ionosphere

    Publication Year: 1972, Page(s):309 - 313
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (670 KB)

    Measurements of electron temperature in the ionosphere using rocket and satellite-borne probes have been made for some years by the Department of Electron Physics and Space Research of Birmingham University, using the experimental technique described. The apparatus, in its latest form, has been developed to provide a more compact and reliable system by exploiting the advantages of linear integrate... View full abstract»

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  • Displays and instrumentation for short-field aircraft

    Publication Year: 1972, Page(s):313 - 314
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (315 KB)

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  • A new monostable circuit with zero stand-by power

    Publication Year: 1972, Page(s):315 - 316
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (375 KB)

    The novel interconnexion of a bridge timing circuit, a switched comparator, and a complementary transistor latching scheme, permits the design of a monostable circuit which consumes `zero¿ standby power and has a pulse width T = CR±3% (C and R being externally connected timing components) for a rail voltage in the range 3V to 30V. View full abstract»

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  • Lead-tin telluride photodiode arrays for detection in the 8¿14 ¿m band

    Publication Year: 1972, Page(s):317 - 320
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (640 KB)

    This paper describes the lead-tin telluride system and its application to the fabrication of fast sensitive infra-red detectors both as single elements and arrays. The electrical and optical properties are discussed with emphasis on the sensitivity of the single elements, and the uniformity in both spectral response and sensitivity for the arrays. (12.1 ¿m, 800, 1) values up to 2.9 × 1010 cm HzÂ... View full abstract»

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  • Absolute measurement of submillimetre and far infra-red laser frequencies

    Publication Year: 1972, Page(s):321 - 327
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1030 KB)

    The frequencies of the hydrogen cyanide and water vapour laser emissions have been measured directly against a fundamental frequency standard by harmonic generation and mixing and beat frequency detection in point contact diodes. The value obtained for the HCN laser (337 ¿m) is 890 760.2 ± 0.2 MHz and for the H2O laser (118 ¿m) 2 527 952.5 ± 1.5 MHz. In addition some preliminary measurements h... View full abstract»

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  • Maximum power transfer in parametric circuits

    Publication Year: 1972, Page(s):328 - 332
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    This paper establishes the conditions under which maximum power transfer in a parametric circuit with port immittances having positive real parts will be achieved with conjugate matching at input and output, and links these results with earlier work which showed, for modulator and mixer circuits, when source and load resistance might also be equal. View full abstract»

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  • A photoconductive detector suitable for optical communications systems

    Publication Year: 1972, Page(s):333 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (747 KB)

    This paper describes a photoconductive detector which, through the use of a microwave bias, is capable of demodulating a low-level signal at information bandwidths greater than 1 MHz. The principle of operation is described and the advantages over d.c. biased photoconductors highlighted. The dependence of photocurrent gain on semiconductor properties and limitations on performances are discussed. ... View full abstract»

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  • Computing time errors introduced by backlash units

    Publication Year: 1972, Page(s):339 - 343
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (490 KB)

    In a device using binary rate multipliers and reversible counters (up/down counters or bidirectional counters) to perform arithmetic operations, the result of computations could oscillate up and down around the exact answer. This oscillation can be minimized by means of backlash units (digital filters). However the introduction of the backlash units will cause an additional error on the computing ... View full abstract»

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  • An application of correlation to radar systems

    Publication Year: 1972, Page(s):344 - 348
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (608 KB)

    This paper considers an application of correlation techniques to radar systems. One particular form of the system, the frequency modulated continuous wave radar, is described and it is shown that with this form of radar, correlation can be obtained by a combination of mixing and spectral analysis. A method of performing the spectral analysis using a digital fast Fourier transform spectral analyser... View full abstract»

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