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Radio Engineers, Proceedings of the Institute of

Issue 8 • Date Aug. 1936

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Displaying Results 1 - 16 of 16
  • [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 July 1, 1936

    Page(s): iv - v
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  • Applications for Membership

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

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

    Page(s): 1053 - 1062
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  • Design and Equipment of a Fifty-Kilowatt Broadcast Station for WOR

    Page(s): 1063 - 1081
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    With its novel directional antenna, WOR produces a maximum field strength toward both New York and Philadelphia while limiting radiation in the direction of the ocean and sparsely populated areas. Radiation distribution measurements are given. The layout of the station and the unique arrangements for lighting, heating, and ventilation of the building are described. A serious attempt has been made to design and operate the equipment for a performance consistent with advanced ideas of high fidelity. Measurements from microphone to antenna of distortion, noise, and frequency response are presented. View full abstract»

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  • Ultra-High-Frequency Transmission between the RCA Building and the Empire State Building in New York City

    Page(s): 1082 - 1094
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    Propagation between these two buildings at a frequency of 177 megacycles has been studied with the object of providing a radio circuit with flat response over three megacycles. It was found that the received signal arrived over several paths, some of which were due to reflections from ground and from near-by buildings. The effects on the indirect rays of horizontal and vertical directivity, and change in angle of polarization were observed. The theoretical response curve for an assumed combination of rays was compared with the curves obtained experimentally. View full abstract»

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  • Electron Optical System of Two Cylinders as Applied to Cathode-Ray Tubes

    Page(s): 1095 - 1139
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    The electron beam of a cathode-ray tube is usually focused by means of an electron optical system of two coaxial cylinders. This paper presents a detailed treatment of such a focusing system and is divided into two parts. Geometric electron optics of axially symmetric electrostatic fields is presented in Part I. This part deals with (1) the analogy between light and electron optics, (2) motion of electrons in axially symmetric electrostatic fields, (3) definition and determination of positions of cardinal points due to axially symmetric electrostatic fields, and (4) thick and thin lenses. The lenses equivalent to the electrostatic fields of two coaxial cylinders are discussed in Part II. This part deals with (1) positions of cardinal points due to two coaxial cylinders of various diameters and at various voltages, (2) use of such cardinal points, (3) experimental determination of positions of cardinal points, and (4) spherical aberration of electrostatic field due to two cylinders. The results are applied to the cathode-ray tube, throughout the discussion. View full abstract»

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  • Magnetron Oscillators for the Generation of Frequencies between 300 and 600 Megacycles

    Page(s): 1140 - 1157
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    The need for vacuum tube generators capable of delivering appreciable power at frequencies from 300 to 600 megacycles is pointed out and the negative resistance magnetron is suggested as one of the more promising generators for this purpose. An explanation of the negative resistance characteristic in a split-anode magnetron is given by means of a special tube which makes possible the visual study of electron paths. In this manner it is demonstrated how most of the electrons starting toward the higher potential plate reach the lower potential plate. From the static characteristics it is shown how the output, efficiency, and load resistance can be calculated, and from this analysis it is concluded that the negative resistance magnetron is essentially a high efficiency device at low frequencies. Measurements of efficiency at ultra-high frequencies are given for several magnetrons under various operating conditions. It is concluded from these measurements that the decrease of efficiency at very high frequencies is mainly due to electron-transit-time effects. A general curve is given showing efficiency as a function of the "transit-time ratio." This curve indicates that for a transit time of one-fifteenth of a period, approximately fifty per cent efficiency is possible; for one-tenth of a period, thirty per cent; and for one-fifth of a period, the efficiency is essentially zero. Two methods are described for increasing the plate-dissipation limit. One method is that of increasing the effective heat-dissipating area by the use of an internal circuit of heavy conductors. View full abstract»

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  • Book reviews

    Page(s): 1158
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  • Booklets, catalogs and pamphlets received

    Page(s): 1159
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  • Contributors to this issue

    Page(s): 1160
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Aims & Scope

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

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