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Electrical Engineers, Proceedings of the Institution of

Issue 1 • January 1970

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Displaying Results 1 - 25 of 61
  • Inaugural address. Electrical manufacture¿today and tomorrow

    Publication Year: 1970, Page(s):1 - 8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1666 KB)

    Engineers differ from pure scientists in being concerned with products which have to be made. Manufacturing processes are therefore of vital importance to the electrical engineer, for they determine the practicability and economic possibilities of his designs. During the last ten years, manufacturing processes have begun to undergo fundamental changes, owing very largely to electronic developments... View full abstract»

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  • IEE Electronics Division: Chairman's address. Radio and weather

    Publication Year: 1970
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1118 KB)

    Radio and the weather are intimately connected: from this stems the interdisciplinary subject of radio-meterorology. Out of the study of the effects of the weather on radio wave propagation, radio techniques for meterorological research and applications are evolved. Some consideration is given in the paper to the relationship between atmospheric electrical discharges (lightning) and associated rad... View full abstract»

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  • Comparison of measured and calculated oblique-incidence radio-wave propagation characteristics

    Publication Year: 1970, Page(s):16 - 22
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (864 KB)

    During the period from January to December 1966, measurements have been made of the mode structure and absorption loss for high-frequency (h.f.) transmissions received over oblique propagation paths ranging in length from 500 to 1000km. The propagation characteristics for these circuits have been evaluated for the conditions appropriate to the period of observation by means of a ray-tracing analys... View full abstract»

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  • Reflection from elevated layers in the troposphere

    Publication Year: 1970, Page(s):23 - 26
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    Signals received beyond the normal horizon by partial reflection at an elevated layer of large vertical gradient of refractive index have been calculated using a high-speed computer. The results, obtained for wavelengths between 1 and 30m and for transmitter-receiver spacings of 100¿400km, are more extensive and accurate than those previously available. The received field strength is most sensiti... View full abstract»

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  • Theory of dipole antennas in dissipative media

    Publication Year: 1970, Page(s):27 - 29
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (297 KB)

    A simple and quantitatively accurate representation of the current distribution in a dipole antenna immersed in a dissipative medium is derived. Numerical data are given and are found to be in good agreement with the experimental results when ¿kh¿¿ 1.0 and ¿Ka¿ ¿ 0.08. View full abstract»

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  • Optimisation of efficiency of reflector antennas: approximate method

    Publication Year: 1970, Page(s):30 - 34
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (495 KB)

    A brief discussion of the theoretical approach to the problem of obtaining the maximum efficiency, for both paraboloidal- and spherical-reflector antennas, is presented. In both types of antenna, the problem reduces to obtaining the optimum combination of amplitude and phase of the hybrid modes propagating in the guide, so that, at the feed aperture, the resultant hybrid field closely matches that... View full abstract»

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  • Zero steering in the directional pattern of a linear array in the presence of mutual coupling

    Publication Year: 1970, Page(s):35 - 40
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (722 KB)

    The effects of mutual coupling and other errors on the directional performance of a zero-steering system for a linear array are considered. Some measured directional patterns, obtained from two different experimental systems employing 4-element-dipole arrays, are shown. The first model employs components of moderate accuracy, the second is a much more complex model are also shown. With a total of ... View full abstract»

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  • Network parameters of a waveguide broad wall-slot radiator

    Publication Year: 1970, Page(s):41 - 45
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    It is found from experimental investigation that the equivalent network of a thin displaced longitudinal slot in the broad wall of a rectangular waveguide changes from a parallel element to a series element a back to parallel element again as the length of the slot is increased from about ¿/2 to about 3¿/2. In the paper, analytical experssions for the immitance variations in the series and shunt... View full abstract»

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  • Assessment of coaxial cable for frequency-division-multiplex transmission by means of a c.w.-burst test signal

    Publication Year: 1970, Page(s):45 - 50
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    A c.w.-burst signal is shown to have certain advantages over both pulse and normal c.w. techniques in the testing of coaxial cables intended for long-distance frequency-division-multiplex systems. The burst is made long enough to integrate the effect of reflections over a length of cable, yet sufficiently short to enable connector and termination reflections to be distinguished from those in the c... View full abstract»

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  • Navigation errors using omega at ranges close to a transmitter

    Publication Year: 1970, Page(s):51 - 55
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (561 KB)

    Experimental measurements of the propagation characteristics of the basic OMEGA frequencies 10.2 and 13.6kHz, made in August 1966, taken over air routes within 2000km of the OMEGA Trinidad transmitter, are used to estimate errors in navigation due to the presence of more than one waveguide-propagation mode close to a transmitter. During the day, the maximum likely error due to propagation effects ... View full abstract»

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  • Polynomial representation of nonlinear feedback shift registers

    Publication Year: 1970, Page(s):56 - 60
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (656 KB)

    A technique is described which enables the feedback logic of a nonlinear feedback shift register to be represented as a nonlinear polynomial, using simple operations on a Karnaugh map. The polynomial form of a nonlinear feedback shift register is capable of furnishing information on the sequential operation of these devices which is not readily apparent from the minterm expansion of the feedback l... View full abstract»

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  • Computer-controlled queuing process with constant-access cycle

    Publication Year: 1970, Page(s):61 - 64
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (437 KB)

    The paper examines a computer-controlled queuing process with a constant access cycle, in which the queue has feedback. The queuing process has a Poisson input, exponential servers and a first-come-first-served queue discipline, but the services must start at an access point because of the computer control. A simple model of the queuing process is presented. The fundamental equations and the gener... View full abstract»

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  • Electronic crosspoints for switching analogue transmission circuits

    Publication Year: 1970, Page(s):65 - 71
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (913 KB)

    Crosspoints are switches which interconnect line and trunk circuits in exchanges. The paper is concerned with switching analogue transmission circuits. Digital-circuit switching has much in common and is briefly mentioned. Exchange switches comprise assemblies of crosspoints. Electronic crosspoints are assembled by wiring which, compared with the mechanical assembly of metal-contact crosspoints, p... View full abstract»

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  • Electronic terminal-exchange unit

    Publication Year: 1970, Page(s):72 - 76
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (831 KB)

    An electronic terminal-exchange unit designed as part of a new system to supersede existing systems, to integrate economically with them in the transition period and to provide all the features of future networks, including substantially improved speech transmission, is described. The unit is suitable for speech, and low-speed analogue and digital data: more specifically, it will terminate, contro... View full abstract»

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  • Signalling and control in communication exchanges

    Publication Year: 1970, Page(s):77 - 82
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (967 KB)

    The introduction of electronics into telephone exchanges requires changes since electronic devices have different switching characteristics and a much higher switching speed than the metal-contact switches which they supersede. They also offer new opportunities in switching and control for systems of the future. Companion papers examine exchange switches and speech transmission. The present paper ... View full abstract»

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  • Transmission aspects of electronic telephone exchanges

    Publication Year: 1970, Page(s):83 - 89
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (944 KB)

    The transmission and other advantages of 4-wire switching with gain available in the 4-wire paths (which electronic exchanges provide) are described in a previous paper. In the present paper, some of the practical problems and possible solutions in the field are investigated, and a more quantitative assessment of the properties of such exchanges is made. It is shown that reference equivalents can ... View full abstract»

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  • Design of wideband transistor amplifiers

    Publication Year: 1970, Page(s):90 - 91
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (246 KB)

    The method of designing wideband feedback amplifiers using alternate series and current feedback is explained. This method is then shown to be very suitable for computer-aided design, and some practical examples are given. View full abstract»

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  • Limitations of network synthesis using negative-impedance convertors

    Publication Year: 1970
    IEEE is not the copyright holder of this material | PDF file iconPDF (120 KB)
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  • IEE Power Divison: Chairman's address. Spinning a yarn

    Publication Year: 1970
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1260 KB)

    The man-made-fibre industry has brought its own problems for the electrical power engineer. Power generation and distribution, special design of small motors, both asynchronous and synchronous, and control systems have all had to be developed, with special attention paid to reliability and continuity of service, combined with maximum economy. A first-hand knowledge of the industry is essential. Mu... View full abstract»

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  • Tooth-flux distribution in slotted solid iron rotors

    Publication Year: 1970, Page(s):101 - 108
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (977 KB)

    The paper presents a detailed set of experimental results for the flux distribution inside slotted solid iron rotors with and without end rings when subjected to alternating and rotating magnetic fields over a range of frequencies from 5 to 50Hz. The experimental results reveal that the flux distribution inside the tooth and inside the slot are radically different, and that, in the rotors with end... View full abstract»

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  • Discussion on "Starting performance of synchronous motors with solid salient poles"

    Publication Year: 1970, Page(s):109 - 110
    IEEE is not the copyright holder of this material | PDF file iconPDF (361 KB)
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  • Losses in Roebel bars: effect of slot portion on circulating currents

    Publication Year: 1970, Page(s):111 - 118
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (832 KB)

    Stator windings in large alternators commonly use Roebel bars in which subconductors (strands) are transposed in the slot portion. Circulating currents may flow between the strands within a bar owing to the leakage fields in the end-winding regions. It is shown in the paper that such circulating current is not only limited by the strand resistances, but that the reactance of the slot portion to ci... View full abstract»

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  • Hunting characteristics of a synchronous machine with two field windings

    Publication Year: 1970, Page(s):119 - 125
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (734 KB)

    Current interest in doubly excited synchronous machines makes it relevant to consider the basic physics of a synchronous machine which has more than one field winding. In this paper, the synchronising and damping torques, which may arise in the individual windings of a large turbogenerator, are examined analytically for a number of different rotor-winding configurations. View full abstract»

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  • Evolution and significance of noise specifications

    Publication Year: 1970
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (146 KB)

    First Page of the Article
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  • Noise from electrical machinesߞthe community and the worker

    Publication Year: 1970
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (146 KB)

    First Page of the Article
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Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

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