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Radio and Electronic Engineer

Issue 5 • Date May 1972

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Displaying Results 1 - 8 of 8
  • Radio receivers and associated systems

    Publication Year: 1972
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1009 KB)

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  • A programmable extended resolution digital differential analyser

    Publication Year: 1972, Page(s):203 - 212
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1482 KB)

    A digital differential analyser is described which features the economical use of parallel arithmetic, programmable interconnexions and internally-scaled integrators. It is suitable for connexion to a general-purpose digital computer to form a hybrid facility and as such would be capable of solving dynamical problems and simulating systems. The use of carry-save techniques and a `trapezoidal¿ int... View full abstract»

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  • Three-resonant-mode adjustment of the waveguide circulator

    Publication Year: 1972, Page(s):213 - 216
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (435 KB)

    In its matched condition the scattering matrix eigenvalues of the three-port circulator lie equally spaced on a unit circle. As the frequency is varied these eigenvalues rotate in the complex plane at different speeds and the phase relation between them no longer corresponds to an ideal circulator. This is primarily due to the fact that the reference eigenvalue is normally associated with a nonres... View full abstract»

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  • An improved radio-frequency probe for the measurement of electron densities in the ionosphere

    Publication Year: 1972, Page(s):217 - 224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2001 KB)

    This paper describes a radio frequency technique for measuring ionospheric electron densities. Extensive use is made of linear integrated circuits and their application is discussed in some detail. Two alternative forms of the instrument are described, one measuring electron number densities from 102 to 106 cm¿3 in four linear ranges, the other covering the same variation in two overlapping logar... View full abstract»

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  • The performance and design of 2:1 bandwidth log-periodic dipole arrays

    Publication Year: 1972, Page(s):225 - 232
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (918 KB)

    Using the author's improved theory7 the radiation pattern and impedance of a 2 : 1 bandwidth log-periodic dipole array are investigated over a wide range of design parameters. Using these results, a general design procedure is formulated for an array having a prescribed radiation characteristic and minimum input v.s.w.r. over the design band. View full abstract»

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  • Height reduction factor of amplifier loaded antennas

    Publication Year: 1972, Page(s):233 - 236
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (462 KB)

    The problem of matching a short monopole antenna by incorporating an ideal amplifier in the monopole structure is analysed. It is shown that this leads to a simple method of predicting which types of transistor amplifier configuration are likely to lead to a height reduction factor over the ¿/4 passive case. View full abstract»

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  • Minimum conversion loss and input match conditions in the broadband mixer

    Publication Year: 1972, Page(s):237 - 242
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (638 KB)

    The two approaches to the optimization of broadband mixer loss are compared and contrasted. Using a recently-developed model of the diode and local-oscillator circuit calculations are made to show the difference in the loss in each case, and the mismatch required at the input to achieve minimum loss. It is concluded that the design procedure in which the mixer is matched at the input is practical,... View full abstract»

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  • A tunable spin-flip magneto-raman infra-red laser

    Publication Year: 1972, Page(s):243 - 248
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1081 KB)

    The observation of intense, magnetic-field tunable, spin-flip Raman scattering in indium antimonide, pumped at two wavelengths, namely, 10.6 ¿m and 5-3 ¿m is reported. The observed tuning range is 9 ¿m to 14 ¿m, and 5.4 ¿m to 5.7 ¿m; the physical processes and experimental techniques are described, and possibilities for extension of the tuning range are discussed. Some future applications of... View full abstract»

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