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Proceedings of the IRE

Issue 9 • Date Sept. 1939

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Displaying Results 1 - 25 of 26
  • [Front cover]

    Publication Year: 1939 , Page(s): c1
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  • Fourteenth Annual Convention

    Publication Year: 1939 , Page(s): c2
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  • Table of contents

    Publication Year: 1939 , Page(s): nil1
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  • Information about the Society

    Publication Year: 1939 , Page(s): nil2
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  • A 50-Kilowatt Broadcast Station Utilizing the Doherty Amplifier and Designed for Expansion to 500 Kilowatts

    Publication Year: 1939 , Page(s): 531 - 534
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1584 KB)  

    Radio station WHAS purchased the first commercial transmitter employing the Doherty high-efficiency amplifier and has installed it in a completely new transmitting plant which is designed for expansion to 500 kilowatts output. The transmitter extends the use of negative feedback for noise suppression and all vacuumtube filaments are heated with alternating current, completely eliminating rotating ... View full abstract»

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  • Recent Improvements in the Design and Characteristics of the Iconoscope

    Publication Year: 1939 , Page(s): 535 - 540
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (4538 KB)  

    The sensitivity and picture-signal output of iconoscopes have recently been increased by a factor of two or three times. The spectral response of the newer tubes more dosely resembles that of the eye and may be controlled by processing. "Dark spot" has been diminished by the use of a cylindrical envelope. The gun design has been changed to give a constant current as the beam is focused, and to pre... View full abstract»

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  • The Image Iconoscope

    Publication Year: 1939 , Page(s): 541 - 547
    Cited by:  Papers (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (4301 KB)  

    An iconoscope having increased sensitivity is to be desired for purposes of improving studio conditions, making possible more universal outdoor work, and permitting greater depths of focus. The new tube described obtains its high sensitivity by making use of an electron image of the scene to be transmitted, projected onto a scanned mosaic. The method permits more efficient and better photocathodes... View full abstract»

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  • Television Pickup Tubes Using Low-Velocity Electron-Beam Scanning

    Publication Year: 1939 , Page(s): 547 - 555
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (4176 KB)  

    Television pickup tubes which use a low-velocity electron beam for scanning a photosensitive target offer the possibility of avoiding some of the limitations of devices which use a high-velocity beam. Some of the advantages of the low-velocity beam are: (1) low level of spurious signals, (2) high maximum signal output, and (3) high efficiency of conversion of light into signal. The major problems ... View full abstract»

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  • A Phase-Shifting Device for the Rapid Determination of Audio-Frequency Amplifier Characteristics

    Publication Year: 1939 , Page(s): 555 - 558
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1064 KB)  

    A description is given of a phase-shifting device which can be used with a beat-frequency oscillator and a cathode-ray oscilloscope to determine quickly the essential points on the frequency-response curve of an audio-frequency amplifier. Use is made of the fact that the phase shift through a single-stage amplifier is ±135 degrees when the gain has dropped to 70.7 per cent of the mid-frequenc... View full abstract»

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  • The Electrostatic Electron Multiplier

    Publication Year: 1939 , Page(s): 558 - 566
    Cited by:  Papers (11)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (3952 KB)  

    This paper describes the design of improved types of electron multipliers in which the electrodes are so shaped and positioned as to provide accurate electrostatic focusing and to minimize space-charge limitations. The first section of the paper describes the general methods available for determining electron trajectories in electrostaticfields. The second section describes the details of design o... View full abstract»

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  • A Consideration of the Radio-Frequency Voltages Encountered by the Insulating Material of Broadcast Tower Antennas

    Publication Year: 1939 , Page(s): 566 - 578
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2968 KB)  

    A knowledge of the radio-frequency voltages on the insulation of broadcast tower antennas is important to the design engineer, since a too-large factor of safety may add unduly to the tower cost. Attention is first given to the base-insulator voltage. The magnitude of this voltage is also of interest in the design of lighting chokes and coupling equipment. Theoretical values are derived and shown ... View full abstract»

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  • Resonant Impedance of Transmission Lines

    Publication Year: 1939 , Page(s): 579 - 584
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1256 KB)  

    The maximum absolute impedance for a tuned circuit which consists of a low-loss radio-frequency transmission line, either short-circuited or open-circuited at its distant end, and shunted at its sending end by a capacitor of negligible resistance is shown theoretically to occur when the line length is practically an integral number of quarter wavelengths and the capacitance is zero. This conclusio... View full abstract»

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  • Currents Induced by Electron Motion

    Publication Year: 1939 , Page(s): 584 - 585
    Cited by:  Papers (182)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (432 KB)  

    A method is given for computing the instantaneous current induced in neighboring conductors by a given specified motion of electrons. The method is based on the repeated use of a simple equation giving the current due to a single electron's movement and is believed to be simpler than methods previously described. View full abstract»

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  • Space-Charge Effects in Electron Beams

    Publication Year: 1939 , Page(s): 586 - 602
    Cited by:  Papers (9)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (3000 KB)  

    The effects of space charge in long, magnetically focused electron beams directed parallel to positively charged sheath electrodes are determined from a simple analysis. The main effects of space charge are: (a) to introduce departure from the potential distribution of the electrostatic case; (b) to set an upper limit for the beam current; and (c) to introduce instabilities and hysteresis phenomen... View full abstract»

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  • Characteristics of the Ionosphere at Washington, D.C., July, 1939

    Publication Year: 1939 , Page(s): 603 - 604
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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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  • Institute news and radio notes

    Publication Year: 1939 , Page(s): 605 - 617
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  • Books

    Publication Year: 1939 , Page(s): 617
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  • Contributors

    Publication Year: 1939 , Page(s): 618 - 620
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  • Commercial Engineering Developments

    Publication Year: 1939 , Page(s): ii - vi
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    First Page of the Article
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  • Current Literature

    Publication Year: 1939 , Page(s): vi - viii
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  • Exhibitors at the 1939 Radio Engineering Show

    Publication Year: 1939 , Page(s): viii - x
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  • Booklets, catalogs and pamphlets

    Publication Year: 1939 , Page(s): x - xiii
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  • Engineering directory [advertisement]

    Publication Year: 1939 , Page(s): xiv
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  • Index [of advertisers]

    Publication Year: 1939 , Page(s): xiv
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  • Positions open

    Publication Year: 1939 , Page(s): xiv
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Aims & Scope

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

Full Aims & Scope