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Radio and Electronic Engineer

Issue 5 • Date May 1967

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Displaying Results 1 - 9 of 9
  • Integrating design and production

    Publication Year: 1967
    IEEE is not the copyright holder of this material | PDF file iconPDF (117 KB)
    Freely Available from IEEE
  • High frequency guided electromagnetic waves in application to railway signalling and control

    Publication Year: 1967, Page(s):275 - 281
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1593 KB)

    The use of guided high frequency electromagnetic waves transmitted along the side of a railway track for the purpose of providing radar location of trains as well as continuous telephonic communication with drivers and guards on the trains is discussed. Attention is drawn to the advantages and shortcomings of different systems already investigated experimentally, and the direction in which further... View full abstract»

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  • A simplified theory of the three-port junction ferrite circulator

    Publication Year: 1967, Page(s):283 - 288
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (518 KB)

    A simplified theory of the three-port junction circulator is given. This theory is applicable to all three-port junctions which rely on the splitting of a pair of degenerate modes and gives the two circulation conditions of the three-port junction circulator in terms of the elements of the equivalent shunt resonator. This is done by first developing the degenerate normal-mode description of the re... View full abstract»

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  • A digital echo-counting system for use in fisheries research

    Publication Year: 1967, Page(s):289 - 294
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1225 KB)

    The echo-counting system to be described was designed for use in conjunction with a high-frequency (100 kHz) echo-sounder and was primarily intended for use in surveying pelagic fish stocks. The counter incorporates a variable gating system, synchronized to the transmission pulse repetition frequency, enabling signals occurring between any twoselected depth limits to be processed. Time-swept gain ... View full abstract»

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  • Communications aspects of underwater telemetry

    Publication Year: 1967, Page(s):295 - 304
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1103 KB)

    Problems associated with reliable underwater telemetry are studied in three categories dictated by the degree to which multi-path propagation effects are experienced. The maximum range obtainable under ideal conditions of a typical telemetry system is investigated as a function of the required information bandwidth. The relevant acoustic properties of the sea are summarized and systems, originally... View full abstract»

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  • Active filters with low sensitivity to element changes

    Publication Year: 1967, Page(s):305 - 316
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1025 KB)

    The active element has the greatest influence on the properties of active filters and may cause oscillations especially in more complicated networks. An active filter network is described which is almost independent of element changes. The analysis shows that the constant of the negative impedance converter may be changed by as much as ±10% without appreciably influencing the properties of the fi... View full abstract»

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  • The radiation characteristics of the backfire helical and zigzag antennae

    Publication Year: 1967, Page(s):317 - 321
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (389 KB)

    In this paper, a type of highly directional, surface-wave antenna is described. This consists of a conventional endfire structure which is terminated by a large surface-wave plane reflector and is thus operated under the backfire condition. Two commonly used endfire structures, namely helical and zigzag, are tested. The improvement is achieved in the half-power beam width View full abstract»

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  • Calculation of resonance frequencies of microwave cavities containing electro-optic crystals

    Publication Year: 1967, Page(s):322 - 324
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    Calculations appropriate to the design of microwave cavities containing uniaxial electro-optic crystals used in the modulation of optical beams are reported. Results for a series of crystals (KDP and isomorphs) embedded in various filler dielectrics are presented as graphsof a frequency parameter against ratio of crystal radius/cavity radius View full abstract»

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  • A special-purpose computer for particle-size analysis

    Publication Year: 1967, Page(s):325 - 335
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1513 KB)

    An analogue computer is described which operates in conjunction with the Karl Zeiss particle-size analyser. The analyser is used to measure the diameter distribution of bubbles in a photograph of a column of foam, and the computer makes use of this information to provide simultaneous and separate indications proportional to total surface area and volume as the analysis proceeds. These indications ... View full abstract»

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