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Radio Engineers, Proceedings of the Institute of

Issue 1 • Date Jan. 1938

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  • Information about the Society

    Page(s): nil1
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  • Officers and Board of Directors 1938

    Page(s): nil3
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  • General Information

    Page(s): nil4
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  • Contents of Volume 26

    Page(s): nil5 - ii
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  • Author index

    Page(s): iii - iv
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  • Index to subjects

    Page(s): v - viii
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  • Incorrect Addresses

    Page(s): ix - x
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  • [Front cover]

    Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Page(s): c2
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  • Contents

    Page(s): [i]
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  • General Information

    Page(s): ii
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  • Institute sections

    Page(s): iii
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  • Geographical Location of Members Elected December 1, 1937

    Page(s): iv
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  • Applications for Membership

    Page(s): v - vi
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  • Officers and Board of Directors

    Page(s): vii
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  • Institute news and radio notes

    Page(s): 1 - 16
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  • The Ultra-Short-Wave Guide-Ray Beacon and Its Application

    Page(s): 17 - 44
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    Part I. Proceeding from the present state of the art of air navigation in the United States and in Germany, the ultra-short-wave instrument landing system in Europe is described. The fundamental principle and the technical improvements are mentioned and practical statements and views are given. Mention is made of the experience gained in the operation of the beacon. The conditions of inversion of the signals one into the other to avoid clicking are stated. The occurrence of split beams is dealt with. Their causes are explained and advice as to how to avoid such trouble is given. In the operation of neighboring beacons, disturbed zones will occur which, by choosing the proper frequency spacing and the proper selectivity of the receivers, may be restricted to such an extent that they will not impair the use of radio beacons in any way. These problems are discussed more in detail. Part II. At first the propagation of ultra-short waves is treated on the basis of the theory of combining reflection and diffraction on the earth with respect to their application to long-range navigation. It results that for a fixed distance and flying height an optimum wave length range exists allowing the airplane to cover ranges of 250 kilometers and more. The investigation of propagation results in the possibility of long-range navigation by means of ultra-short-wave beacons. The experiments made in Australia gave very encouraging results. View full abstract»

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  • Precise Measurements of Electromagnetic Fields

    Page(s): 45 - 54
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    A design of field strength measuring equipment is described wherein the emphasis has been laid upon ability to secure precise measurements in a limited range rather than extreme flexibility. A consideration of the suitability of various fundamental methods for precision work is presented. A circuit design is described by which certain difficulties associated with the insertion of the standard signals into loop circuits are eliminated. An attenuator is described wherein the effects of unavoidable stray reactances are minimized. Experimental results are given indicating ability of the design to achieve accuracies to within better than one per cent at broadcast frequencies. Comparison is made with accuracies attained in the field with alternative methods. View full abstract»

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  • Time-Division Multiplex in Radiotelegraphic Practice

    Page(s): 55 - 75
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    The paper outlines certain methods of multiplexing telegraphic signals on a common communication channel and the factors governing the application of these methods to radio circuits. The recently developed trend toward the use of multiplex methods in radiotelegraphic service is discussed. Consideration is given to the advantages of using the time division method based on the baud, at least at the present state of the radio art. General specifications for the equipment are stated, based on practical operating requirements. Major changes from practices obtaining on wire-line multiplex systems are mentioned and the reasons therefor are given. A description of a practical system based on the above considerations and its use and effectiveness in a large radiotelegraph organization is furnished. View full abstract»

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  • The Basic Principles of Super-Regenerative Reception

    Page(s): 76 - 106
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    By means of cathode-ray oscillograms and mathematical analyses the principal phenomena occurring in superregenerative receivers are explained. The results verify an earlier theory that in the separately quenched detector the received signal merely causes the detector to oscillate at maximum output for a longer period during each quench cycle, without increasing the maximum amplitude of the oscillations. It is also shown that in the self-quenched detector the signal merely produces an increase in the quench frequency, without increasing the maximum amplitude reached by the oscillations. The sensitivity, selectivity, and characteristic noise of superregenerative receivers are discussed. View full abstract»

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  • Note on the Frequency Behavior of Reactances

    Page(s): 107 - 111
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    Some general rules stated previously by Feldtkeller but not definitely proved are shown to be a consequence of the reactance theorem. Other analogous propositions can easily be deduced by the method used here. View full abstract»

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  • Characteristics of the Ionosphere at Washington, D.C., November, 1937

    Page(s): 112 - 114
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    Data on the ordinary-wave critical frequencies and virtual heights of the ionospheric layers are presented for the period indicated in the title. The monthly average values of the maximum usable frequencies for undisturbed days, for radio transmission by way of the regular layers is also provided. View full abstract»

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  • Book reviews

    Page(s): 122 - 124
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  • Contributors to this issue

    Page(s): 125 - 126
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Aims & Scope

This Periodical ceased production in 1938. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope