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Electrical Engineers, Proceedings of the Institution of

Issue 5 • Date May 1967

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Displaying Results 1 - 25 of 25
  • Propagation measurements at 3.6 and 11Gc/s over a line-of-sight radio path

    Publication Year: 1967, Page(s):545 - 549
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    The results of signal-level recordings at 3.6Gc/s and 11Gc/s made simultaneously for a 12-month period over a 55km line-of-sight radio path are given. Two types of fading were encountered: that due to interference between two or more rays and that due to absorption caused by atmospheric precipitation. An attempt is made to correlate the latter with precipitation rate. A method of measuring the cha... View full abstract»

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  • Effect of irregular fields on aperture reception characteristics

    Publication Year: 1967, Page(s):550 - 552
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (294 KB)

    Formulas are given which describe the receiving properties of an aperture when the incident radiation contains a spatially irregular component, as may arise after propagation through an irregular medium. Results are derived for the degradation of power gain, the variance of the power output and the correlation between the outputs from spaced apertures. Illustrative numerical data are given for the... View full abstract»

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  • Diffraction by a deeply modulated random-phase screen

    Publication Year: 1967, Page(s):553 - 556
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (425 KB)

    A study is made of the intensity fluctuations of waves diffracted by a random screen which imposes large phase changes on an incident plane wave. Numerical results are given for the magnitude of the fluctuations as a function of the distance from the screen; the focusing effect previously found by Mercier is further investigated, and its distance from the screen is related to the magnitude of the ... View full abstract»

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  • Prediction of attenuation by rainfall in the 10.7ߝ11.7 GHz communication band

    Publication Year: 1967, Page(s):557 - 565
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1550 KB)

    An empirical relationship relating the mean quasi-instantaneous rainfall rate along a microwave path and the signal attenuation over the path at 11 GHz has been obtained and is compared with a theoretical formula derived by Ryde. A relationship between the annual distributions of several measured point rainfall rates for periods of 2, 10, 20 and 60min has also been obtained. This has been used, in... View full abstract»

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  • Corona and precipitation interference in v.h.f. television reception

    Publication Year: 1967, Page(s):566 - 576
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1661 KB)

    An investigation has been made into a type of interference occurring during thundery weather which may mar reception on v.h.f. In particular, it causes a degradation of the quality of pictures received in Britain for rebroadcasting purposes. Both laboratory and field experiments are described, from which the mechanisms giving rise to corona interference and precipitation interference are deduced. ... View full abstract»

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  • Isotropic directional transponder beacon. Replying in a direction determined by the incoming signal

    Publication Year: 1967, Page(s):577 - 580
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (550 KB)

    A 3-dimensional multielement transponder array is proposed which will give directional replies towards the sources of interrogating signals. The potentialities and limitations of the principle are briefly analysed, and a number of variants and extensions of the basic scheme are considered. View full abstract»

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  • Direction-finding performance of a wide-aperture sampling linear array

    Publication Year: 1967, Page(s):581 - 588
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (883 KB)

    The statistical performance of a 225m sampling linear array in h.f. direction finding is presented. Several methods of processing the sampled data are employed to investigate various aspects of system performance. The equivalence of time and space sampling in reducing the variance in the estimated direction of arrival is deduced from the results. View full abstract»

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  • Maximisation of directive gain for circular and elliptical arrays

    Publication Year: 1967, Page(s):589 - 594
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (662 KB)

    The paper begins with a general formulation of the gain-optimisation procedure for an array with an arbitrary geometrical configuration. The formulation is then specialised to apply to a planar array. In particular, extensive computed data for the maximum obtainable directive gain of circular and elliptical arrays are presented and compared with those with a uniform amplitude and cophasal excitati... View full abstract»

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  • Technique of fabricating inhomogeneous mediums and the behaviour of a dipole in such a medium

    Publication Year: 1967, Page(s):595 - 603
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1147 KB)

    It is shown that an inhomogeneous medium to be used for antenna experiments can be fabricated using the diffusion profile of NaCl into agar agar. Various problems relating to the construction of a 316gal agar agar tank are described. The production of a desired profile of the electrical properties of the medium is discussed, together with the experimentally determined driving-point admittance and ... View full abstract»

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  • Waveguide structures for double-beam leaky-wave antennas

    Publication Year: 1967, Page(s):604 - 610
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (860 KB)

    The behaviour of two types of leaky-wave antenna is described, where more than one mode of propagation is supported in the leaky waveguide. The radiation pattern of such antennas contains one main lobe for each mode of propagation, and the design of a double-beam antenna is studied in some detail. First, consideration is given to a slotted double-ridge waveguide. It is shown both theoretically and... View full abstract»

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  • Noise in transistor mixers at low frequencies

    Publication Year: 1967, Page(s):611 - 618
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The paper deals with the noise performance of transistor mixers at frequencies where reactive effects may be neglected (generally less than 0.1fT). The analysis involves the consideration of noise processes in a time-varying circuit, and the problem is treated by returning to the basic physical equations describing the transistor. The problem of noise in the transistor-base current is discussed in... View full abstract»

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  • New international switching and transmission plan recommended by the CCITT for public telephony

    Publication Year: 1967, Page(s):619 - 627
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1407 KB)

    In order to lay the foundation of a worldwide telephone network that will eventually provide fully automatic international subscriber dialling between any two subscribers anywhere in the world, the CCITT, at its 3rd Plenary Assembly in 1964, recommended the principles of new routing, numbering, switching and transmission plans for international public telephony. The paper briefly describes the rou... View full abstract»

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  • Sensitivity optimisation in active RC-network synthesis

    Publication Year: 1967
    IEEE is not the copyright holder of this material | PDF file iconPDF (105 KB)
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  • Representation of faults in the dynamic simulation of h.v. d.c. systems, by digital computer

    Publication Year: 1967, Page(s):629 - 638
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1230 KB)

    The paper introduces and develops digital-computer techniques for the representation of faults in the dynamic simulation of h.v. d.c. systems. The authors have employed the central-process method of representation, which is based on the fact that h.v. d.c. convertor operation consists of similar consecutive processes. This method enables convertor bridges, their control systems, the transmission l... View full abstract»

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  • Standardisation and approval of electrical equipment for use in hazardous atmospheres

    Publication Year: 1967, Page(s):639 - 644
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1108 KB)

    As a result of the increasing use of electrical equipment in situations where there is a potential explosion hazard owing to flammable gases and vapours, there is considerable international activity in the preparation of new and revised standards for the design and use of such equipment. This review compares the present position in Britain with the position abroad, with regard both to methods of p... View full abstract»

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  • Developments in the performance and theory of segmental-rotor reluctance motors

    Publication Year: 1967, Page(s):645 - 653
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1216 KB)

    The paper describes some of the improvements that have been achieved, both experimentally and theoretically, in reluctance motors with purely segmental rotors. These improvements result from incorporating a shallow axial channel in the centre of the air-gap face of each segment, filling of this channel with conducting material, shaping of the ends of the segments and optimisation of the significan... View full abstract»

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  • Variable-characteristic d.c. machines

    Publication Year: 1967, Page(s):654 - 655
    IEEE is not the copyright holder of this material | PDF file iconPDF (302 KB)
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  • Polyphase induction motor with single-phase rotor

    Publication Year: 1967, Page(s):655 - 656
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    First Page of the Article
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  • Characteristics of an arc discharge in sulphur hexafluoride

    Publication Year: 1967, Page(s):657 - 660
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (463 KB)

    Voltage gradients and electrode-fall voltages have been measured for an SF6 arc burning in a 6.35mm-diameter tube. The voltage gradients are lower than those in a nitrogen arc, the reason being that the thermal conductivity of the SF6-arc plasma is lower, than that of a nitrogen plasma. Using previously calculated electrical and thermal conductivities the theoretical voltage gradients agree very c... View full abstract»

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  • R.F. permeability measurements of ferrite aerial rods

    Publication Year: 1967, Page(s):661 - 664
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    Normally, the magnetic properties of ferrites, such as permeability and losses, are determined by measurements on ring samples. Extruded products, however, are mostly anisotropic, so that data obtained from rings cut out of the rods are not representative of the properties of the extrusions. The paper deals with the measurement of the initial permeability of ferrite rods at high frequencies (about... View full abstract»

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  • Analogue of cylindrically symmetric fields using teledeltos paper

    Publication Year: 1967, Page(s):664 - 665
    IEEE is not the copyright holder of this material | PDF file iconPDF (268 KB)
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  • Self-adjustable orthogonal digital filters for system identification and optimisation

    Publication Year: 1967, Page(s):666 - 670
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (546 KB)

    The paper describes the application of orthogonal systems of functions to the problem of designing digital filters with independent adjustable parameters for the open-loop control of processes. A computational algorithm is given for designing the digital filter and is applied to the problems of process identification and the determination of discrete compensators for optimum closed-loop control sy... View full abstract»

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  • Overall station control at Hunterston A

    Publication Year: 1967, Page(s):671 - 678
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (893 KB)

    Design or analysis of nuclear-power-plant overall-control systems involves transient representation the behaviour of the reactors, boilers, turbines and ancillary plant. The representation of 2-phase transient heat transfer in evaporators and the transient behaviour of steam drums is particularly important. Typical system representations may contain 150 ordinary differential equations, many of the... View full abstract»

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  • Design and application of a stochastic analogue computer

    Publication Year: 1967, Page(s):679 - 688
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1164 KB)

    It is shown that a fast analogue representation of Laplace's equation and the diffusion equation may be obtained using a Monte Carlo method, and a number of problems are examined involving various boundary configurations. An analysis of errors of solution is included, and the paper also presents a graphical technique for obtaining the switching points in a time-optimal problem for a distributed-pa... View full abstract»

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  • Construction of the generalised functional matrix

    Publication Year: 1967
    IEEE is not the copyright holder of this material | PDF file iconPDF (88 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