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Electrical Engineers, Proceedings of the Institution of

Issue 10 • Date October 1967

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Displaying Results 1 - 25 of 38
  • Two-diode bandpass parametric amplifier

    Publication Year: 1967, Page(s):1365 - 1372
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (797 KB)

    The gain-bandwidth performance of a filter-type degenerate parametric amplifier incorporating two synchronously pumped varactor diodes is analysed for general conditions, in which the source and load are not necessarily matched to the characteristic impedance of the filter. The diodes are the shunt capacitive elements in a conventional bandpass filter. Experimental work carried out in the h.f. ban... View full abstract»

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  • Unilateral 2-diode parametric amplifier

    Publication Year: 1967, Page(s):1373 - 1377
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    A parametric amplifier in which two varactor diodes are incorporated in a low-pass filter has been analysed when the phase of pumping of the diodes differs by ±¿/2. It is shown that good forward gain can be achieved with concomitant unity gain in the reverse direction. The theory is verified by experimental work on an amplifier operating in the h.f. band. View full abstract»

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  • Synchronous digit switching in highly interconnected communication networks

    Publication Year: 1967, Page(s):1378 - 1384
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (833 KB)

    Highly interconnected networks to be used for the distribution of high-speed digital information are currently the subject of design studies by both civil and military research organisations. One problem in such networks is that any frequency asynchronism between the oscillators which control digit switching at trunk exchanges can result in loss of information. Methods of controlling the frequency... View full abstract»

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  • Input modulation (i.e. interchannel crosstalk) in constant-resistance modulators for use in f.d.m. systems

    Publication Year: 1967, Page(s):1385 - 1390
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (687 KB)

    The various causes of modulation in the input circuit of a constant-resistance ring modulator (in which input modulation is ideally absent) are analysed theoretically and discussed on the basis of the analysis and of experimental results. View full abstract»

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  • Range of l.f. transmissions using digital modulation

    Publication Year: 1967, Page(s):1391 - 1398
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1074 KB)

    The paper analyses the ranges obtained using digital transmissions and frequencies in the range 30¿300kc/s. Parameters are assumed which could be met by a mobile installation using solid-state amplifiers and a wire antenna supported by a captive helicopter. The calculations are for both binary and 32-ary f.s.k. modulation, and they take into account groundwave and skywave propagation, fading and ... View full abstract»

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  • Bridge square-wave generator

    Publication Year: 1967, Page(s):1399 - 1402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (442 KB)

    A new circuit is proposed which uses a bridge network for the timing element. The square-wave generator consists of an RC bridge network, a voltage comparator and a pair of electronic switches. The circuit analysis in the paper shows that the generator is self compensating with respect to power-supply variations and to variations in the active circuit components. The frequency stability therefore ... View full abstract»

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  • Triangular stepped helical aerial

    Publication Year: 1967, Page(s):1403 - 1408
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (671 KB)

    A triangular stepped helical aerial, that is a helical aerial in which the axial length varies in discrete steps rather than continuously, has the same relative wideband radiation and impedance characteristics of a conventional axial-mode helical aerial, despite its discontinuous structure. The observed radiation and impedance characteristics of an equilateral-triangular stepped helix radiating in... View full abstract»

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  • Electrical characteristics of corners in surface-wave lines

    Publication Year: 1967, Page(s):1409 - 1417
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (973 KB)

    The theory of surface-wave propagation around sharp corners in single-wire transmission lines is developed. Two main topics are studied: radiation loss at corners and radiation patterns of corners. An integral expression is obtained for the transmission loss of a corner, and theoretical curves are computed for the entire range of corner angles from 0° to 180°. The theoretical curves are in good ... View full abstract»

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  • Nonlinear diaphragms in waveguides

    Publication Year: 1967, Page(s):1418 - 1424
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (773 KB)

    Diaphragms made of ferrite slabs or metal diaphragms with ferrite screens have nonlinear susceptibility dependent on the applied transverse direct magnetic field. Such diaphragms, employing D type ferrite material, have been used at frequencies of 9 and 10GHz for coupling to a cavity, and measurements of v.s.w.r., Qfactor and impedance have confirmed theoretical predictions that by altering the ma... View full abstract»

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  • Shielding factors for electrostatic aerials

    Publication Year: 1967, Page(s):1425 - 1427
    IEEE is not the copyright holder of this material | PDF file iconPDF (341 KB)
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  • Phase characteristics of filters using the Legendre-polynomial approximation

    Publication Year: 1967, Page(s):1427 - 1428
    IEEE is not the copyright holder of this material | PDF file iconPDF (190 KB)
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  • Constant-speed solutions applied to the evaluation of induction-motor transient torque peaks

    Publication Year: 1967, Page(s):1429 - 1435
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (826 KB)

    The paper outlines the derivation of a constant-speed transient torque solution for a polyphase induction motor for any switching condition. A representative selection of computed torque/time patterns is given, for a 5hp motor, including all torque components. These are compared with actual experimental results. Also for this motor, the way in which the transient negative torque varies with speed ... View full abstract»

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  • Slip-energy-recovery schemes and the use of pole-change windings

    Publication Year: 1967, Page(s):1436 - 1442
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (718 KB)

    The paper considers the general effects that may be obtained when slip-ring induction motors incorporating pole-change windings are employed in slip-energy-recovery schemes. It is concluded that, in some instances, considerable reductions in the rating of the slip-energy-recovery equipment may be achieved. Alternatively, a significant increase in the range of operation may be obtained, without the... View full abstract»

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  • Effect of m.m.f. and permeance harmonics in electrical machines, with special reference to a synchronous machine

    Publication Year: 1967, Page(s):1443 - 1450
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (796 KB)

    Real electrical machines differ from the conventional models of generalised theory primarily in three ways: they are magnetically nonlinear, windings produce m.m.f. harmonics in addition to the fundamental, and air-gap permeance harmonics higher than the second are significant. The practical effects of the latter two complications on terminal characteristics are discussed with particular reference... View full abstract»

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  • Synchronising and damping torques in synchronous machines

    Publication Year: 1967, Page(s):1451 - 1457
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (736 KB)

    The paper investigates synchronous-machine damping and synchronising torques analytically and experimentally, in two distinct reference frames. The first is that of Park and the second is a freely rotating frame used by Kron, Ku and others. it is found that the uniformly rotating free frame presents a clear picture of the nature of the torque components and the sources of these during hunting cond... View full abstract»

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  • Discussion on 'Calculation of switching phenomena in power systems' and 'Calculation of switching transients with particular reference to line energisation'

    Publication Year: 1967, Page(s):1457 - 1463
    IEEE is not the copyright holder of this material | PDF file iconPDF (1031 KB)
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  • Aluminium windings for hydroelectric generators: a critical analysis

    Publication Year: 1967, Page(s):1464 - 1470
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (810 KB)

    There has been considerable progress in substituting aluminium for copper in electrical apparatus such as busbars and transformers, but little or none in rotating electrical machines. Making certain simplifying assumptions, the paper evolves a mathematical analysis for salient-pole generators by which the losses, dimensions and cost of a generator with aluminium windings, with the same rating and ... View full abstract»

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  • Discussion on "Method of rapidly reversing large currents in highly inductive loads"

    Publication Year: 1967, Page(s):1471 - 1472
    IEEE is not the copyright holder of this material | PDF file iconPDF (330 KB)
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  • Rating of bare overhead conductors for continuous currents

    Publication Year: 1967, Page(s):1473 - 1482
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1376 KB)

    The maximum continuous rating of a short transmission line is often based on the maximum permissible operating temperature of the conductors under the combined effects of wind, sun and air temperature. The paper describes measurements made in still air and in four different wind tunnels to determine the heat transfer from stranded-copper, aluminium, aluminium-alloy and steel-cored-aluminium (s.c.a... View full abstract»

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  • Distance protection of teed circuits

    Publication Year: 1967, Page(s):1483 - 1498
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1725 KB)

    Multiended network interconnections, such as teed circuits, invariably pose special difficulties in their protection, and the methods of relaying that have been widely applied to plain feeders are often of limited applicability to circuits having more than two ends within the protected zone. Many of the difficulties and limitations have for long been acknowledged, and the paper seeks to extend the... View full abstract»

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  • Electrostatic field studies for busbars running in ducts

    Publication Year: 1967, Page(s):1499 - 1506
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (941 KB)

    Various proposals are now being studied for running h.v. conductors supported by insulating spacers in cylindrical gas-filled ducts, in the paper, it is suggested that for economy and convenience a single cylindrical duct may be used to house more than one conductor. A 3-phase system is considered having each conductor separately housed in a duct with a cross-section which is a 120° sector of a c... View full abstract»

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  • Theoretical aspects of mechanical stresses in a paper-lapped cable insulation

    Publication Year: 1967, Page(s):1507 - 1510
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (500 KB)

    Mechanical stresses in a paper-lapped insulation which arise from the bending of a cable around a drum immediately after the lapping process are considered theoretically, and an estimate is obtained for the stress arising from the contact of the insulation with the drum. A known relation between interfacial pressure and lapping tension is rewritten to give the tension explicitly in terms of a pres... View full abstract»

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  • Design features of a 240 MVA 275/132 kV site-assembled autotransformer

    Publication Year: 1967, Page(s):1511 - 1517
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1458 KB)

    After a brief review of the conflict between increasing unit sizes and transport-weight limitations and the various methods of overcoming this, the paper outlines the design philosophy underlying the principle of subdivision and reassembly on site and discusses the reasons for adopting the particular method described in the paper and applied to a pilot exercise. Vertical subdivision of the complet... View full abstract»

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  • High-frequency effects in induction motors

    Publication Year: 1967, Page(s):1518 - 1519
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (321 KB)
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  • Effect of excitation regulation on synchronous-machine stability

    Publication Year: 1967, Page(s):1519 - 1520
    IEEE is not the copyright holder of this material | PDF file iconPDF (254 KB)
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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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