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Proceedings of the IRE

Issue 6 • Date June 1945

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Page(s): c1 - c2
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  • Table of contents

    Page(s): 1a
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  • The Institute of Radio Engineers Incorporated

    Page(s): 2a
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  • Hendrik Johannes van der Bijl

    Page(s): 352
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  • Engineering Training for Industry

    Page(s): 355 - 357
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    First Page of the Article
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  • A Summary and Interpretation of Ultra-High-Frequency Wave-Propagation Data Collected by the Late Ross A. Hull

    Page(s): 358 - 373
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    Until his death in 1938, Ross A. Hull, late editor of QST, the official publication of the American Radio Relay League, had been studying the propagation of 60-megacycle waves between Blue Hill, near Boston, Massachusetts, and his home on Seldon Hill, near Hartford, Connecticut. He was aided in obtaining facilities for this work by the Blue Hill Observatory of Harvard University. An analysis of portions of the data recorded by Hull indicates that, with certain extensions and minor variations, his theories were leading toward the now apparently correct solution of the ultra-high-frequency propagation problems. It was indicated that propagation far beyond the horizon was produced by refraction or reflection in the tropospheric strata. Calculations of radius of ray curvature have been made from data provided by the United States Weather Bureau, from stations near the propagation terminals points. It is indicated that radii of curvature less than the radius of the earth are coincident with conditions favorable to the propagation of strong signals over this path extending far beyond the horizon. A simple equation is given for calculating the radius of ray curvature. It is concluded that more accurate meteorological data with finer structure characteristics should make possible more precise calculation of propagation conditions. It also appears that certain meteorological conditions may be assumed when various propagation conditions are encountered. View full abstract»

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  • Cathode-Ray Tubes and Their Applications

    Page(s): 373 - 381
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    A joint service-industry program of standardization and specification of cathode-ray tubes has resulted in improvements in performance as well as in uniformity of production and has laid the foundation for more intelligent design of electronic equipment using these tubes. Much progress has been made recently in both techniques and designs of cathode-ray tubes and circuits. Both brightness and resolution of the fluorescent spot have been improved. New intensifier-type tubes have been developed for high accelerating potentials with high deflection sensitivities, considerably extending the range of visual observation and photographic recording of cathode-ray traces. Better response of deflection amplifiers to transient or pulse signals has been attained, together with improvements in linear timebase circuits for presenting such signals on scales measured in microseconds rather than milliseconds, and in timing circuits for calibrating them. Signal- and sweep-delay circuits have been developed to facilitate viewing certain types of patterns. New techniques have suggested new applications of cathode-ray equipment in many fields of laboratory, military, and industrial measurement. Mechanical devices can be tested readily for vibration, balance, and speed; electrical circuits and components may be inspected; optical problems may be studied, as by the cathode-ray spectrograph; and the nondestructive testing of many metals can be accomplished. It is expected that the improved cathode-ray tubes and techniques developed during the past few years, many of which have not yet been publicly described, will be applied to laboratory and production equipment as well as to television transmission and reception. View full abstract»

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  • The Image Formation in Cathode-Ray Tubes and the Relation of Fluorescent Spot Size and Final Anode Voltage

    Page(s): 381 - 389
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    A new equivalent-optical system consisting of three lenses is proposed to represent the electron-optical system of a cathode-ray-tube gun. The image formation by these lenses is discussed. It is concluded that the fluorescent spot is an image of the cathode and that its size is almost independent of the value of the final anode voltage EAif lens errors can be disregarded. The solid angle of the electron beam proceeding from the second lens to the main focusing lens contracts in inverse proportion to the final accelerating voltage, as expressed by the formula r2EA=constant, r being the radius of the electron beam. Measurements on a number of cathode-ray tubes of widely different design confirm these predictions. The new theory is compared critically with the earlier "cross-over" theory which led to different predictions. Some applications of the new conception to practical, cathode-ray-tube design are briefly discussed. View full abstract»

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  • Characteristics of Chlorinated Impregnants in Direct-Current Paper Capacitors

    Page(s): 389 - 397
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    Direct-current capacitors of the impregnated-paper type play an important role in electronic equipment required by the Armed Services. In some of these applications good performance is required over very wide temperature ranges. A new chlorinated-hydrocarbon composition which maintains reasonable capacitance constancy over a wide temperature range is described. The properties of this liquid are compared with conventional chlorinated impregnants. Since some alternating voltages usually accompany the direct voltages applied to capacitors, the alternating-current behavior over wide temperature and frequency ranges is described for capacitors impregnated with three different liquids. The effect of voltage and temperature on the resistance of capacitors is discussed. Considerable attention is devoted to the life behavior of capacitors impregnated with chlorinated liquids under direct-current stresses at high temperatures. A life-testing procedure is described which has yielded very satisfactory results on capacitors of varying sizes and ratings. A means for prolonging the life of capacitors impregnated with chlorinated impregnants involving the addition of stabilizers is discussed. Data showing effect of a number of stabilizers are presented. Finally, some data are presented showing the effect of voltage on the life of direct-current capacitors. View full abstract»

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  • Mutual and Self-Impedance for Colinear Antennas

    Page(s): 398 - 408
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    In Part I a two-element colinear array, consisting of identical center-driven antennas of finite radius, is discussed as a boundary-value problem. A formulation is given for the distribution of current when the antennas are driven symmetrically and antisymmetrically. From these data the impedance properties of the array may be deduced. In Part II a simplified, but much less rigorous investigation of the same problem is presented. The more important results include curves and tables for mutual and self-impedance. View full abstract»

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  • Note on Impedance Matching of Shunt-Fed Half-Wave Dipole

    Page(s): 408 - 410
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    The formula for the spacing between feeding points of the shunt-fed, horizontal, half-wave dipole is obtained. The spacing is found to be a function of radiation resistance and characteristic impedance of the dipole, and of the characteristic impedance of the feeding line. Curves are calculated showing that the assumption of equal dipole and feeder-line characteristic impedance may lead to considerable error in the calculation of the spacing of feeding points. View full abstract»

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  • Institute news and radio notes

    Page(s): 410 - 417
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  • Books

    Page(s): 417 - 418
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  • Contributors

    Page(s): 418 - 420
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  • Section meetings

    Page(s): 34a - 36a
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  • Membership

    Page(s): 36a - 68a
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  • Positions open

    Page(s): 50a - 56a
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Aims & Scope

This Periodical ceased production in 1962. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope