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Radio and Electronic Engineer

Issue 3 • Date September 1969

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Displaying Results 1 - 11 of 11
  • The engineer's world

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (115 KB)

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  • An automatic picture transmission cloud cover receiving station

    Publication Year: 1969, Page(s):123 - 130
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1490 KB)

    The automatic picture transmission (APT) sub-system carried on weather satellites transmits, at facsimile rate, cloud cover photographs of the Earth below. Frequency modulation of a carrier in the 137 MHz band transmitted at a level of 5 watts is used to give pictures representing an area approximately 2400 km (1500 miles) square with an average resolution of 3 km (2 miles). Major factors governin... View full abstract»

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  • An extension of Karnaugh Map technique to interface design

    Publication Year: 1969, Page(s):131 - 136
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    Karnaugh Map methods for designing counters and shift registers can be extended to parallel code conversion or interface design. A number of examples are shown, including the derivation of some wellknown circuits. The possibility of steering J-K and D type flip-flops is considered. Finally, an example illustrating the use of a three-dimensional Karnaugh Map is given. View full abstract»

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  • A wideband amplitude modulator as a special silicon integrated circuit

    Publication Year: 1969, Page(s):137 - 146
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1337 KB)

    A transistor circuit for silicon integrated circuit construction incorporating a new design of modulator is described. The circuit is associated with a microphone amplifier and r.f. input stage. The output consists of an amplitude modulated carrier in which the a.f. components have been suppressed. The circuit is suitable for modulation frequencies well into the video range and carrier frequencies... View full abstract»

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  • Terminating impedances in diode modulators and mixers

    Publication Year: 1969, Page(s):147 - 152
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (558 KB)

    Analysis of diode modulators and mixers is complicated by the need to examine the ratio of source to load impedance. In a number of circuits the optimum ratio is unity, and it is pointed out that a set of conditions can be developed, allowing this to be predicted in most cases before analysis. View full abstract»

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  • A multi-level light integrator

    Publication Year: 1969, Page(s):153 - 156
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (386 KB)

    An instrument which integrates the number of minutes during which average light intensity falls between or outside nine pre-set levels is described. The primary use of the equipment is in the study of the response of plants to light. The technique may have other applications. View full abstract»

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  • Digital techniques in load cell weighing

    Publication Year: 1969, Page(s):157 - 164
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1085 KB)

    Typical load cell characteristics are listed and some factors concerning loading are given. An all-electronic system for digitizing the output of load cells directly is described, and details are given of some basic systems used to obtain control and information facilities from the digital weight-signals, with some fundamentals of the binary arithmetic used. Some weighing applications are mentione... View full abstract»

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  • Latitude, altitude, azimuth and polarization angle dependence of scattering of radio waves in the ionosphere considering anisotropy

    Publication Year: 1969, Page(s):165 - 168
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    This paper describes the latitude, altitude, azimuth and polarization angle dependence of scattering of radio waves in the ionosphere. The anisotropic behaviour which arises due to the presence of the geomagnetic field has been taken into account. The formula obtained for scattering cross-section may be verified experimentally and the importance of the geomagnetic field in the production of anisot... View full abstract»

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  • A survey of the developments in antenna servo techniques

    Publication Year: 1969, Page(s):169 - 177
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (901 KB)

    The paper considers the factors that influence the servo design for satellite tracking antennae. The methods of servo compensation are discussed and simple adaptive techniques are illustrated. The importance of the mechanics in relation to the servo performance is emphasized and the application of digital computers in servo tracking loops is discussed. A `design¿ example is given. View full abstract»

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  • Complementary monostable multivibrator

    Publication Year: 1969, Page(s):178 - 180
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    The circuit described has good stability and long delay periods with good load-driving capabilities. A modified circuit is also presented which has stable delay periods even when large transient voltages are present on the supply, such as can be experienced in an industrial environment. View full abstract»

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  • Multi-mode excitation of large aperture horns to produce electronic deflection of directional pattern

    Publication Year: 1969, Page(s):181 - 184
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (314 KB)

    A method for producing electronic deflection of directional pattern of apertures, large compared to the wavelength, by exciting a number of modes, particularly in a horn, is discussed. Such electronic deflection of directional pattern of apertures could be usefully employed, amongst others, as hardened antennas for application in ground systems of navigation satellites, satellite-controlled satell... View full abstract»

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