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Radio and Electronic Engineer

Issue 4 • Date April 1974

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Displaying Results 1 - 13 of 13
  • Guglielmo Marconi, 1874ߝ1937

    Page(s): 185 - 187
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (540 KB)  

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  • Carbon composition, cracked carbon, metal film and metal oxide resistors

    Page(s): 188 - 194
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    Typical manufacturing processes, nominal parameters and the major advantages and disadvantages of carbon composition, metal oxide, carbon film and low value nickel film resistors are discussed. The structure of these resistors is shown by photomicrographs, in some cases coupled with X-ray probe analysis. View full abstract»

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  • Realization of a double-ladder operational amplifier network by CA-association

    Page(s): 195 - 199
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    The transfer function of a double-ladder network constrained by an infinite gain operational amplifier is realized by associating it with a C parameter (CA-association). A low-pass network can always be realized by such an association; whereas, in the realization of a transfer function with finite transmission zeros, there are some constraints. View full abstract»

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  • Production testing of capacitors

    Page(s): 201 - 208
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    The progress of automatic testing of capacitors is summarized and an indication given of future trends. The most promising method of testing is to make contact to a large number simultaneously and to carry out a sequence of tests by automatic switching under computer control. The best place for this testing is while the components are orientated in manufacturing jigs. At the present time the speed of testing is limited by that of the transfer system. View full abstract»

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  • Connector standards and BS 9000

    Page(s): 209 - 215
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2449 KB)  

    A brief history of early standards and war-time connectors is followed by an account of the work of the post-war component standardization committees which led to the reports by the Burghard Committee and the BS9000 series of standards. Two sub-committees of BSI, TLE6/8 and TLE21/2 dealt respectively with r.f. and l.f. connectors and after early setbacks which were a result of the unfamiliar nature of BS9000, work on a number of specifications proceeded. Mention is also made of some of the auxiliary work associated with the specifications; the work of the R.F. Committee on crimping is an example. A detailed list of the many projects under way or nearly completed is given. View full abstract»

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  • Noise limitations in digital recording

    Page(s): 216 - 217
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    Previous studies have shown that the tape limited signal/noise ratio (s.n.r.), which may be deduced from first principles, is in close agreement with practice on many modern recorders. This s.n.r. depends upon the medium properties and the recording format, in particular the trackwidth and bandwidth. Since the digital linear density usable is related to the bandwidth, it is possible to derive expressions linking the s.n.r., trackwidth, linear and area digital densities. It is concluded that the s.n.r. available at an area density of 107bits/in2, which is a factor of ten higher than present maxima, is still adequate to permit reliable digital recording. View full abstract»

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  • The thermal rating of metallized film capacitors under pulse conditions

    Page(s): 218 - 226
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    Simple expressions are derived for the power dissipation in metallized film capacitors under some common pulse current conditions. Using these, the sinusoidal current ratings may be used to estimate the suitability of the capacitors for pulse applications. Tables are given to facilitate the use of the results. View full abstract»

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  • Recent BSI Publications

    Save to Project icon | PDF file iconPDF (156 KB)  
    Freely Available from IEEE
  • Space technology

    Save to Project icon | PDF file iconPDF (170 KB)  
    Freely Available from IEEE
  • Report of the IERE Benevolent Fund Trustees for 1972¿73

    Page(s): 230 - 231
    Save to Project icon | PDF file iconPDF (185 KB)  
    Freely Available from IEEE
  • R & D Laboratory Notes

    Page(s): 233 - 234
    Save to Project icon | PDF file iconPDF (422 KB)  
    Freely Available from IEEE
  • Frank Noel Bulley

    Save to Project icon | PDF file iconPDF (194 KB)  
    Freely Available from IEEE
  • New Books Received

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    Freely Available from IEEE