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Radio and Electronic Engineer

Issue 10 • Date October 1977

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Displaying Results 1 - 9 of 9
  • 99 Gower Street

    Publication Year: 1977
    IEEE is not the copyright holder of this material | PDF file iconPDF (351 KB)
    Freely Available from IEEE
  • The application of m.f.s.k. techniques to h.f. telegraphy

    Publication Year: 1977, Page(s):435 - 444
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1135 KB)

    The paper briefly describes the history and the principles of m.f.s.k. signalling as applied to h.f. telegraphy. It quotes mathematical relationships for the performance of such systems, and derives equations for the occupied bandwidth. These relationships, together with the results of measurements carried out on different experimental m.f.s.k. systems, and practical limitations suggested by exper... View full abstract»

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  • RC active variable group-delay equalizers with independent Q and ¿ controls

    Publication Year: 1977, Page(s):445 - 448
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The high-speed transmission of data over voice frequency telephone links creates the need for variable group-delay equalization networks. This paper describes two alternative group-delay sections, the characteristics of which may be continuously adjusted over the approximate bandwidth (300 to 3000 Hz). Both of the proposed networks provide for the desired degree of group-delay adjustment using onl... View full abstract»

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  • Design of self-checking and fault-tolerant microprogrammed controllers

    Publication Year: 1977, Page(s):449 - 454
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (649 KB)

    A realization of a self-checking and fail-safe programmable controller which uses a new control memory organization to give a simple and elegant implementation is described. Using this self-checking controller as an example, a new approach to fault-tolerant design referred to as Dual-Fail-Safe (DFS) is presented which utilizes two self-checking modules. The resulting fault-tolerant system is shown... View full abstract»

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  • Developing interactive systems for the small machine environment

    Publication Year: 1977, Page(s):455 - 459
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (575 KB)

    This paper describes the design methods, and tools, for developing interactive systems which will run in the small machine environment. The constraints of this environment are discussed, and it is shown that the requirements of users in this environment are rather stringent, but for systems with a well engineered interface rather than for high performance. The solution adopted is to provide realis... View full abstract»

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  • A method for the determination of the T-equivalent-circuit parameters of microwave structures

    Publication Year: 1977, Page(s):460 - 464
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A method is described for the measurement of the equivalent circuit parameters of waveguide-mounted structures, such as a post or an inductive iris. Experimental results for post structures centrally mounted in X-band waveguides are also given. The values obtained are found to agree closely with those predicted from theory and the estimated accuracy is about 5%. View full abstract»

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  • Automatic input attenuator for h.f. communication receivers

    Publication Year: 1977, Page(s):465 - 469
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    The final selectivity of a communication receiver is generally determined by the bandwidth of the i.f. filters. When the a.g.c. of the receiver is determined only by the signals passing these filters, severe overloading of the relatively broadband h.f. gain stages may occur. Reducing this risk of overloading requires a broadband attenuator at the input of the receiver. The attenuation should be de... View full abstract»

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  • Letters: Harmonic summation

    Publication Year: 1977, Page(s):470 - 471
    IEEE is not the copyright holder of this material | PDF file iconPDF (302 KB)
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  • Recent trends in automative radar

    Publication Year: 1977, Page(s):472 - 476
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (811 KB)

    The possible advantages to be gained from the development of vehicle radar systems are outlined and the factors influencing the design of a suitable system are discussed. The various types of system which are commonly considered are introduced and their relative merits and associated problems are explained. Reference is made to typical experimental systems of each type. It is concluded that signif... View full abstract»

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