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Electrical Engineers, Proceedings of the Institution of

Issue 7 • Date July 1967

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Displaying Results 1 - 25 of 32
  • Analytic determination of dipole reactance by radiation-pattern integration

    Publication Year: 1967, Page(s):853 - 858
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    The paper describes a method for determining the input reactance of a cylindrical dipole by analytic continuation of the Poynting-vector integration into the `invisible¿ part of the radiation pattern. The theoretical basis for this method, which was described recently for planar aerials, is extended to cylindrical radiating systems. The reactance of a thin dipole is evaluated for a range of dipol... View full abstract»

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  • Current distributions in short-circuited rectangular loops

    Publication Year: 1967, Page(s):859 - 863
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    The current distribution in each arm of a short-circuited rectangular loop placed in a uniform electric field parallel to one side of the loop is evaluated. The effect of switches which bisect the loop and thus modulate the current distribution is analysed, and it is concluded that this forms a useful method, at any given frequency, of measuring magnetic fields in the far zone, irrespective of the... View full abstract»

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  • Scattering by a finite cylinder

    Publication Year: 1967, Page(s):864 - 868
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (642 KB)

    Scattering of a plane wave by a finite, conducting, right-circular cylinder is treated by geometrical diffraction theory. Formulas appropriate for calculating radar cross-section as a function of frequency, polarisation, aspect angle and bistatic angle are presented. Calculations for two large cylinders are in very good agreement with monostatic measurements against aspect angle for four linear-po... View full abstract»

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  • Computer-controlled adaptive radar

    Publication Year: 1967, Page(s):869 - 872
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (743 KB)

    A new type of radar system is described in which a real-time online computer is used (a) to develop tracks from plots and (b) to control beam direction and transmitter modulation to refine this information progressively. The main object of the paper is to discuss the effect of complete automaticity on the transmissions required. It is concluded that adaptive variability is best obtained using a fo... View full abstract»

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  • Determination of microwave-tube transfer functions

    Publication Year: 1967, Page(s):873 - 877
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (596 KB)

    With the advent of sophisticated radar systems employing pulse-compression techniques, a clear understanding of the phase and amplitude characteristics of the circuit elements is paramount. Various techniques for phase/frequency measurements have been developed, and the search for more comprehensive methods continues. It is suggested that the impulse response of a circuit provides a novel way to d... View full abstract»

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  • Numerical solution of waveguide-discontinuity problems

    Publication Year: 1967, Page(s):878 - 886
    Cited by:  Papers (31)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1053 KB)

    A method for the solution of waveguide-discontinuity problems using a digital computer is described, and examples are given to illustrate possible applications. For the method to be applied, the discontinuity must lie entirely in a surface transverse to the direction of propagation, and various techniques are described for treating planar discontinuities. Examples include a change in waveguide cro... View full abstract»

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  • Bandwidth in varactor harmonic generators

    Publication Year: 1967, Page(s):887 - 893
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (678 KB)

    The variation of efficiency and power output with frequency for varactor harmonic generators is evaluated. It is assumed that single tuned circuits are used at the input and output frequencies and that no idlers are present. The analysis basically refers to abrupt-junction doublers, but, using approximate techniques, it can be extended to other cases, and one such is included. The analysis include... View full abstract»

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  • New RC-active-network synthesis procedures using negative-impedance convertors

    Publication Year: 1967, Page(s):894 - 901
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (954 KB)

    A new configuration is introduced which can be used in active-RC-network synthesis. It uses an ideal voltage-controlled voltage amplifier having a negative gain of order unity and a voltage- or a current-inversion negative-impedance convertor. Three synthesis procedures using the configuration are described. The sensitivity is minimised using coefficient sensitivities; for a particular transfer fu... View full abstract»

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  • Validity of first-order f.m. distortion theory as applied to trunk radio systems

    Publication Year: 1967, Page(s):903 - 906
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (585 KB)

    Much of the published work relating to distortion in frequency-modulation trunk radio systems has been, and continues to be, based on a so-called `first-order theory¿. In the course of some correspondence published a few years ago, the validity of this first-order theory was questioned in a general way, although no evidenec was given to show whether or not serious errors arise when the theory is ... View full abstract»

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  • Speech-level control in telephone instruments

    Publication Year: 1967, Page(s):907 - 915
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1225 KB)

    The range of conditions to be catered for in the design of a general-purpose telephone instrument is discussed to show that the human, environmental and telephone-system variables are such that no one instrument can give complete satisfaction over the whole range. A system of speech-level control is described whereby instruments may be developed which have greater usefulness in some of the more ex... View full abstract»

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  • Analysis of data from lightning-flash counters

    Publication Year: 1967, Page(s):916 - 923
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1143 KB)

    Data from observations with lightning-flash counters in England and Singapore show the diurnal and seasonal variations, and comparisons are made with the established observations of thunderstorm days. Estimates of radio noise to be expected from local storms are compared with noise measurements made at the same times, and, from the discrepancies which occur, it is concluded that some measured dayt... View full abstract»

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  • Field intensity versus radiated power, height and thickness of a linear antenna

    Publication Year: 1967, Page(s):923 - 924
    IEEE is not the copyright holder of this material | PDF file iconPDF (221 KB)
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  • Erratum: Diffraction by a deeply modulated random-phase screen

    Publication Year: 1967
    IEEE is not the copyright holder of this material | PDF file iconPDF (58 KB)
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  • Modern transmission-line maintenance

    Publication Year: 1967, Page(s):925 - 932
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1216 KB)

    The major postwar developments in the British overhead-transmission-line system consisted of the superposition of first 275kV lines, and secondly 400kV lines, on the original 132kV Grid system. The original lines were constructed with men or horses to tension conductors, and maintenance largely used manual tools. Today, highly specialised power-tensioning equipment is evolving, faults are electron... View full abstract»

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  • Electrical installation practice in some Western-European countries

    Publication Year: 1967, Page(s):933 - 935
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    The paper surveys installation practice, standards of apparatus and testing and inspection procedures in a number of Western-European countries and draws comparisons with British practice. Particular reference is made to the lack of earthing, the greater use of plastics and the more onerous conditions of installation inspection commonly found abroad. Information is given regarding some of the Euro... View full abstract»

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  • Discussion on 'Composite polar characteristics in multizone systems of phase-comparison distance protection'

    Publication Year: 1967, Page(s):936 - 938
    IEEE is not the copyright holder of this material | PDF file iconPDF (485 KB)
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  • Steady-state stability of alternators as affected by voltage regulators

    Publication Year: 1967, Page(s):939 - 945
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (917 KB)

    The paper presents the results of steady-state-stability investigations of a regulated electrical system, conducted to determine the best set of parameters of the voltage regulator from the view point of stability. The effects of the main-regulator-loop parameters, such as the gain and the time constants of the exciter, stabilising circuit and first-derivative control etc., on the stability of the... View full abstract»

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  • Discussion on "New designs for h.v. insulators using synthetic materials" and "Suppression of insulator flashover by resistive surface films"

    Publication Year: 1967, Page(s):946 - 948
    IEEE is not the copyright holder of this material | PDF file iconPDF (562 KB)
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  • Harmonic instability between controlled static convertors and a.c. networks

    Publication Year: 1967, Page(s):949 - 957
    Cited by:  Papers (57)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1262 KB)

    A controlled mercury-arc or thyristor convertor with a conventional firing-pulse control system can both generate and magnify a.c. harmonics additional to the fifth, seventh etc. of classical convertor theory. This effect is normally of little importance if the impedance of the a.c. system is low, but it is shown by analysis that, if this impedance is relatively high, as may occur on the larger si... View full abstract»

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  • Single-unit p.a.m. induction frequency convertors

    Publication Year: 1967, Page(s):958 - 964
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1025 KB)

    The paper describes the application of the principle of pole-amplitude modulation (p.a.m.) to the well known induction frequency changer. By using a single secondary winding responsive to two fields simultaneously, the need for two separate machines is eliminated. The driving motor and the `excited¿ machine are combined in a single frame of conventional construction. A number of allied developmen... View full abstract»

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  • Effects of interaction among groups in a multigroup a.c.ߝd.c. convertor

    Publication Year: 1967, Page(s):965 - 973
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1021 KB)

    The paper presents an analysis of the behaviour of multigroup convertors. In such convertors, for certain system configurations and operating conditions, an interaction takes place amongst convertor groups. The mechanism of interaction is analysed, and it is shown that this is due to a commutating impedance shared by the convertor groups. This interaction, which is expressed in terms of a coupling... View full abstract»

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  • Investigation of induction motors with unbalanced secondary winding connections

    Publication Year: 1967, Page(s):974 - 977
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (499 KB)

    Unbalanced circuits in an induction motor due to unsymmetrical rotor-winding connections are con sidered, and their equivalent circuits have been derived with the aid of positive- and negative-sequence networks. The equivalent circuits are verified by experimental investigations. The effects of unbalance in the rotor on motor performance are studied. The factors of importance in choosing certain u... View full abstract»

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  • Discussion on "New developments in high-pressure discharge lamps"

    Publication Year: 1967, Page(s):977 - 980
    IEEE is not the copyright holder of this material | PDF file iconPDF (649 KB)
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  • Characteristic properties of oil-impregnated laminated synthetic insulation for extra-high-voltage cables

    Publication Year: 1967, Page(s):981 - 988
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1173 KB)

    In the paper a review is given of the properties of oil-impregnated lapped-plastic-tape dielectrics for use as insulation in extra-high-voltage underground cables. The following subjects are discussed: choice of combinable materials, impregnation technique, results of breakdown measurements as a function of various different parameters, dielectric-loss measurements and thermal conductivity, it app... View full abstract»

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  • Wide-ratio 2-speed single-winding induction motors

    Publication Year: 1967
    IEEE is not the copyright holder of this material | PDF file iconPDF (156 KB)
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Aims & Scope

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

Full Aims & Scope