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Radio and Electronic Engineer

Issue 4 • Date April 1979

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Displaying Results 1 - 9 of 9
  • News and commentary

    Publication Year: 1979, Page(s):165 - 166
    IEEE is not the copyright holder of this material | PDF file iconPDF (299 KB)
    Freely Available from IEEE
  • The new 16-bit microprocessors and their impact on control and automation

    Publication Year: 1979
    IEEE is not the copyright holder of this material | PDF file iconPDF (173 KB)
    Freely Available from IEEE
  • The V.D.U. and the operator

    Publication Year: 1979, Page(s):172 - 173
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (274 KB)

    A programme of research into the likelihood of damage to operators' eyes resulting from the increasing use of visual display units was recently commissioned by the Association of Optical Practitioners. In general the study by two members of the A.O.P. Occupational Visual Welfare Committee, S. Rosenthal and J. Grundy, showed that no evidence existed of damage or harmful effects on eye-sight as a re... View full abstract»

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  • Letters to the Editor: The chartered engineer's degree

    Publication Year: 1979
    IEEE is not the copyright holder of this material | PDF file iconPDF (171 KB)
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  • Energy sources of the future: a challenge to man's ingenuity

    Publication Year: 1979, Page(s):175 - 180
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (913 KB)

    The reserves of fossil fuels are analysed and some of the methods being developed to improve the energy yield from existing reserves are looked at, including enhanced oil recovery and magnetohydrodynamics. Other sources of energy not relying on fossil fuels are considered. Some could be tapped immediately or with some straightforward development, e.g. nuclear fission, solar, tidal and wave power. ... View full abstract»

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  • Recent advances in optical fibre communications

    Publication Year: 1979, Page(s):182 - 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (510 KB)

    Optical fibre cables are currently available having transmission losses of 3 dB/km and bandwidth x length products of 1 GHz km at an operating wavelength of 0.85¿m. At the longer wavelength of 1.3¿m attenuations as low as 0-5 dB/km, and repeater spacings of 50 km, have been demonstrated in the laboratory. The corresponding bandwidth of graded-index multimode fibres can be large, even with light-... View full abstract»

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  • A test equipment for the measurement of phase and frequency instability in v.h.f. and s.h.f. sources

    Publication Year: 1979, Page(s):187 - 196
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1342 KB)

    This paper describes a simple method of measuring instabilities in communication systems such as satellite links. The technique is based on the use of a modified commercial phase meter and frequency synthesizer. This can linearly measure the magnitude of phase variation of a source, in a bandwidth of 1 kHz with a resolution down to 0.5 deg peak to peak, relative to a stable reference. Frequency in... View full abstract»

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  • Experimental analysis of v.h.f. antennas for helicopter homing systems using scalemodel techniques

    Publication Year: 1979, Page(s):197 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (932 KB)

    The use of scale modelling for assessment of helicopter homing systems is described, including appropriate measurement techniques for different frequency bands. The interaction of the antennas with the metal fuselage is of primary importance, and this is illustrated in three different homing applications. View full abstract»

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  • Microprocessor implementation of tactical modems for data transmissions over v.h.f. radios

    Publication Year: 1979, Page(s):204 - 210
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (686 KB)

    The advent of the single-chip microprocessor has made possible the use of digital signal processing in low-cost communications circuitry. The all-digital approach has been used in a high-performance data modem for the transmission of burst messages through the voice channel of v.h.f. narrow band f.m. radio sets. The techniques used in this novel design of software modem are illustrated by referenc... View full abstract»

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