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Radio and Electronic Engineer

Issue 7 • Date July 1971

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Displaying Results 1 - 7 of 7
  • Whither quality and reliability?

    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (134 KB)  

    Earlier this year, after effecting a change in the terms of reference and funding of the British Productivity Council, the Government decided to discontinue the Grant-in-Aid to the National Council for Quality and Reliability. The following appraisal of the work of N.C.Q.R. during its ten years and some thoughts on its future role has been contributed by the Institution's representative on N.C.Q.R. since its formation in 1961. View full abstract»

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  • Recent advances in wave buoy techniques at the national institute of oceanography

    Page(s): 291 - 301
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1845 KB)  

    The well-established Doughnut and Cloverleaf wave buoys developed by N.I.O. are described briefly and details of a disposable wave buoy, at present under development, are given. Because of certain operational difficulties experienced with the Doughnut buoys, a digital telemetry system has been developed and this is described in full detail. The system allows for simultaneous sampling of up to 10 analogue channels, at 0.25 second intervals, with 0.2% accuracy. View full abstract»

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  • Analysis and control of the permanent-magnet stepper motor

    Page(s): 302 - 308
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (779 KB)  

    A stepper motor has the ability to translate digital signals into angular shaft positions. This paper deals with the dynamic characteristics of a 90° permanent magnet motor, when used to switch a load through a sequence of angular steps. The non-linear system equations are derived, and linearized versions of these equations are used to estimate the dynamic response for single-step operation. Multi-step performance is computed directly from the non-linear equations. The effect on performance of a constant current or constant voltage supply is considered, and it is shown that the transient response can be modified with a negative impedance converter. View full abstract»

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  • Measuring techniques for u.h.f. television transmitters employing klystrons

    Page(s): 309 - 314
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (757 KB)  

    The paper describes the measuring techniques associated with complete u.h.f. transmitter installations, indicating the large range of test equipment that is required. An indication of the considerable distortions produced by a klystron amplifier is given, but no attempt is made to detail the mechanisms involved. View full abstract»

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  • Applying the phase-locked loop in communications and instrumentation

    Page(s): 315 - 320
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (727 KB)  

    The mode of operation of the phase-locked loop is briefly described, an analytical note being given in an Appendix. Communication applications are the tracking receiver, f.m. detection, the phase-locked homodyne and f.s.k. detection. Instrumentation applications are phase modulation, pulse-width modulation, phase-locked servo for magnetic recording and a phase-locked frequency standard. The voltage controlled oscillator, phase detector and loop filter necessary in these applications are discussed. View full abstract»

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  • H.F. communication receiver performance requirements and realization

    Page(s): 321 - 329
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1635 KB)  

    Discusses h.f. communication problems and the stringent and often conflicting requirements placed on the performance of any h.f. communication receiver. The H2900 receiver has been designed with these requirements in mind. The receiver uses a novel method of digital frequency synthesis allowing for small frequency increments of 1 Hz. View full abstract»

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  • A standard colour monitor matching comparator

    Page(s): 330 - 336
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1465 KB)  

    This paper surveys the problem of matching colour television monitors and the relative merits of optical or electronic aids. An optical design for assessing the normalizing white of a colour monitor is then discussed at length, and comments are made in detail on the alternative solutions at each stage of the design. It is concluded that a Lummer-Brodhun matching field, together with a tungsten lamp and glass filter combination for the reference D65, form an economical solution to the problem of a standard reference illuminant. Design flexibility allows the instrument to be used for other applications such as checking film review screens, and shadow mask tube phosphors. View full abstract»

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