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Radio and Electronic Engineer

Issue 6 • Date June 1963

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Displaying Results 1 - 18 of 18
  • Commonwealth relations

    Publication Year: 1963
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    Freely Available from IEEE
  • Lambda: a radio aid to hydrographic surveying

    Publication Year: 1963 , Page(s): 479 - 492
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1783 KB)  

    The word LAMBDA is an abbreviation for ¿low ambiguity Decca¿ and refers to a radio position-fixing system used by hydrographic survey ships. A fix is obtained by measuring the distance from the ship to shore stations; the c.w. master transmitter and the receiver are carried on the ship and the two slave stations are sited on land. This paper describes the principles of the LAMBDA system with special reference to the method of lane identification. Circuits and practical details of the equipment are described and notes are included on wave propagation aspects and the performance of the system in the field. View full abstract»

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  • Absorption of sound in sea-water

    Publication Year: 1963 , Page(s): 493 - 500
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (788 KB)  

    Laboratory and field data on the absorption of sound in sea- water are reviewed in the light of modern theory, including effects of pressure, temperature and salinity. The effects of temperature and MgSO4 salt concentration appear to be compatible from one investigator to another. There is some dispute, however, about the absolute value of the coefficient. The pressure effect has been measured for pure water, but has not been applied to the ocean as far as the authors know. The importance of this pressure effect on bottom loss measurements is shown to be sizable. An expression is presented for sound absorption in sea-water as a function of frequency, temperature, pressure and salt concentration. View full abstract»

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  • Discussion on ¿Absorption of sound in sea-water¿

    Publication Year: 1963
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  • Prediction methods for sonar systems

    Publication Year: 1963 , Page(s): 501 - 508
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (972 KB)  

    Performance prediction in sonar is centred around the so-called sonar equation relating various parameters defined by the medium, the target, and the equipment. In this paper an active sonar equation valid for both short transient and long-pulse sonars is presented, and a discussion is given of each of the sonar parameters. Of particular interest is a generalized source level for comparing explosive and pulsed sonars, and prediction expressions for reverberation and detection threshold. An illustration of the use of these concepts is a recent determination of the back-scattering coefficient of the deep sea bed using explosive sound sources. View full abstract»

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  • Points from the discussion on ¿Prediction methods for sonar systems¿

    Publication Year: 1963
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  • The design of a 4096-word one-microsecond magnetic film store

    Publication Year: 1963 , Page(s): 509 - 516
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (780 KB)  

    The store is made up of a large number of aluminium plates coated with thin magnetic film. It is word-organized and bi-directional digit currents are used for writing. The word and digit lines consist of conductors pressed against the plates and these define the storage positions on the continuous areas of film. Advantage is taken of the low impedance of the film to provide the word selection at low cost. A store-size ferrite core serves as the selection device for each word and a matrix of diodes directs the drive currents the chosen lines of cores. A single set of digit conductors are used for both sensing and write back and these serve all the 4096 words of the store. The digit current disturbance is minimized by a special balancing arrangement. View full abstract»

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  • Techniques for the optimization of controlled processes

    Publication Year: 1963 , Page(s): 517 - 524
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (751 KB)  

    Some mathematical representations of processes are con-sidered and a general statement made of the requirements for optimization. By assuming that the process output is a quadratic function of the variables it is shown how various approximation techniques can be adapted to sampled systems. Finally a transformation is given, which enables the past history of a process to be of utility in correcting deviations which occur in a process already optimized. It is indicated that thistransformation may also be useful in designing electronic equipment for ease of operation. View full abstract»

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  • The application of statistical techniques to vibration analysis and testing

    Publication Year: 1963 , Page(s): 525 - 532
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (958 KB)  

    The realization that most environmental vibration includes random motion has led to new techniques for analysis and simulation. The most important parameters of analysis are spectral density and amplitude distribution; these are denned and analysis methods indicated. Limitations of analysis due to non-stationarity and sampling errors are mentioned, and the methods of finding test levels are described. The simulation of random motion and its attendant difficulties are considered. View full abstract»

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  • Discussion on ¿The application of statistical techniques to vibration analysis and testing¿

    Publication Year: 1963 , Page(s): 532 - 534
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  • On the improvement of detection and precision capabilities of sonar systems

    Publication Year: 1963 , Page(s): 535 - 540
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    The paper surveys recent advances in signal processing techniques in sonar, indicating trends in the use of diversified types of pulses, correlation and multiplication techniques and instrumental evaluation of signals. View full abstract»

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  • Points from the discussion on ¿On the improvement of detection and precision capabilities of sonar systems¿

    Publication Year: 1963
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  • A magnetic amplifier for low-level telegraph signals

    Publication Year: 1963 , Page(s): 541 - 546
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (599 KB)  

    In the design of submerged repeaters for submarine telegraph cables, the need arises for a circuit capable of amplifying very low frequency signals with great reliability. It is highly desirable that the bulk of the apparatus be reduced to a minimum. A repeater circuit is described, in which a magnetic amplifier is used for frequency conversion of the telegraph signals. View full abstract»

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  • Properties of inhomogeneous cylindrical waveguides in the neighbourhood of cut-off

    Publication Year: 1963 , Page(s): 547 - 555
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1046 KB)  

    For suitable values of the properties of a dielectric or ferrite rod, concentrically placed in a waveguide of circular cross-section, the phase constant of the H11mode, expressed as a function of frequency, is twovalued over a range of frequencies in the neighbourhood of cut-off. In the two-valued region, one branch of the phase-constant curve has positive slope and the other negative slope, corresponding respectively to forward and backward waves. The field components and power distribution of these waves are discussed, and a method is suggested of separating the two kinds of wave by a mode filter. It is shown that at two values of the frequency where the group velocity is zero there is a high concentration of energy in the guide; this would be infinite in the lossless case, but where losses are present due to imaginary parts of the dielectric constant of the rod, and of the permeability elements in the case of a ferrite rod, they become large when the group velocity is zero, and so prevent the energy concentration from rising beyond a certain level. Over part of the waveguide cross-section the power is negative, and when the group velocity is negative the negative power exceeds the positive power. When the energy in the guide is large compared with the rate of transfer of energy, the system behaves somewhat like a cavity, and a ¿Q¿ can be defined. View full abstract»

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  • Data logging in power generating stations

    Publication Year: 1963 , Page(s): 559 - 570
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2079 KB)  

    The applications of alarm scanning and data logging techniques in the operation of boiler/turbine units in conventional power generating stations are discussed. Consideration is given to the operational requirements with emphasis on the importance of careful selection of the data to be logged. A generalized equipment specification is considered; the problems encountered at the input interface and the methods of dealing with a wide range of different types of input signal are discussed. A description is given of a 200 point alarm scanning and data logging system. An account is given of the practical experience gained as a result of this project. View full abstract»

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  • Discussion on ¿Data logging in power generating stations¿

    Publication Year: 1963 , Page(s): 570 - 571
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  • Corrigendum: Visual detection in intensity-modulated displays

    Publication Year: 1963
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  • Corrigendum: An instructional aid for digital computer logic

    Publication Year: 1963
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