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Radio and Electronic Engineer

Issue 3 • Date March 1965

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Displaying Results 1 - 14 of 14
  • International exhibitions

    Publication Year: 1965
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (110 KB)  

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  • Institution notices

    Publication Year: 1965
    Save to Project icon | PDF file iconPDF (131 KB)  
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  • A technique for the time-transformation of signals and its application to directional systems

    Publication Year: 1965 , Page(s): 135 - 141
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (721 KB)  

    This paper describes a passive time-transformation technique (`Stretch¿) that permits an exchange of signal time duration for bandwidth. It is not limited to electrical signals or to a particular portion of the spectrum. It is linear in the sense that the principle of superposition is applicable. Good waveform fidelity is preserved and signals that are resolvable at the input remain resolvable at the output, even though the bandwidth may be changed by a large factor. Signal/noise ratios are not affected by the transformation. The basic components of the system are: (1) the uniformly dispersive delay device in which envelope delay is a linear function of frequency and phase shift is a parabolic function of frequency, and (2) the heterodyne mixer in which the heterodyne signal is linearly modulated in frequency. By proper combinations of these non-linear phase and amplitude elements, systems can be devised to speed up, slow down, or reverse the time scale of the input signal. In much the same way that a transformer permits matching the impedance properties of a circuit, the technique permits matching of the bandwidth capabilities of the circuit. One of the most obvious applications is to enable the observation or transmission of extremely fast phenomena with economical, low-bandwidth equipment. Other applications include speed-up of signals to permit efficient time-division multiplexing and the generation of accurately controlled fast waveforms. Application of the technique to wide-bandwidth, wide-baseline directional systems will be discussed. Removal of most of the bandwidth takes place at the individual receiving sites. Because the phase and amplitude characteristics of the signals are preserved, remoting, combining, processing and recording of the information can be performed at practical bandwidths. View full abstract»

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  • Discussion on ¿A technique for the time-transformation of signals and its application to directional systems¿

    Publication Year: 1965 , Page(s): 141 - 142
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  • The use of quantizing techniques in real time Fourier analysis

    Publication Year: 1965 , Page(s): 143 - 148
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (597 KB)  

    The purpose of the present paper is to present a general theory of the effect of quantizing upon digital computation of Fourier transforms. A similar theory applies in relation to correlation functions. The theory is relevant to spectral analysis and to a number of practical problems in signal detection schemes notably directional systems. Detection of a weak signal upon a noise background may be dependent upon the ability of a system to distinguish between the correlation functions of the signal and the noise background. The correlation functions are functions of both time and space. If a receiving array in space is steered by means of time delays between appropriate elements and if the response is processed by digital methods then the computation time determines the time for a complete sweep through the directions of interest. Such time may be reduced by very coarse quantizing before digital processing. A measure of the maximum errors arising from such quantization is provided by the theory. View full abstract»

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  • Discussion on "The use of quantizing techniques in real time Fourier analysis"

    Publication Year: 1965
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  • The mechanism of interference pick-up in cables and electronic equipment with special reference to nuclear power stations

    Publication Year: 1965 , Page(s): 149 - 158
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1287 KB)  

    The various forms of electrical interference in nucleonic reactor control equipment have been recently studied in the U.K.A.E.A. The results of this work are discussed and an analysis is made of interference due to interconnecting cables. Other causes of interference are mentioned and a method ofin situtesting is described which can be used to diagnose the sources of interference pick-up and to establish the interference sensitivity of a completed installation. View full abstract»

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  • Accelerating medical progress through medical engineering

    Publication Year: 1965 , Page(s): 159 - 160
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

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  • Large capacity magnetic film stores¿a design approach

    Publication Year: 1965 , Page(s): 161 - 171
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1115 KB)  

    The organization of large capacity magnetic film stores is considered. It is shown that the best compromise is obtained when all the strip transmission lines are extended in length until the limit imposed by attenuation and delay is reached. The number of continuous sections of both word and digit lines, and hence the number of auxiliary electronic circuits required for a store of given capacity and speed, is expressed in a novel manner as a function of the cross-sectional dimensions of strip lines. This expression is optimized to give the optimum store organization. The demands made on constructional techniques and electronic circuit elements by such a store are considered and the limits within which magnetic film stores are likely to be economical are suggested. View full abstract»

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  • The lincompex system for high frequency radio telephony

    Publication Year: 1965
    Save to Project icon | PDF file iconPDF (167 KB)  
    Freely Available from IEEE
  • Progress in electromechanical filters

    Publication Year: 1965 , Page(s): 173 - 182
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3379 KB)  

    The development of techniques for manufacturing electromechanical filters is discussed and the change from single rods with turnedin necks to built-up construction described. Single-sideband filters and miniature types are then described and methods of eliminating spurious modes are shown. View full abstract»

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  • Discussion on ¿Progress in electromechanical filters¿

    Publication Year: 1965 , Page(s): 182 - 184
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  • The design principles and rÿle of a comprehensive unit system of electronic equipment. with particular reference to the harwell 2000 system

    Publication Year: 1965 , Page(s): 185 - 195
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1818 KB)  

    The development of a unit system of electronics for a large research organization has evolved design principles which are thought to apply to other comprehensive unit systems. These principles, and the benefits which attend such systems, are reviewed. View full abstract»

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  • Radio engineering overseas ¿

    Publication Year: 1965
    Save to Project icon | PDF file iconPDF (146 KB)  
    Freely Available from IEEE