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Proceedings of the Institute of Radio Engineers

Issue 4 • April 1931

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  • [Front cover]

    Publication Year: 1931, Page(s): c1
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  • Future Events

    Publication Year: 1931, Page(s): c2
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  • Contents

    Publication Year: 1931, Page(s): i
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  • General Information

    Publication Year: 1931, Page(s): ii
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  • Suggestions for Contributors to the Proceedings

    Publication Year: 1931, Page(s): iii
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  • Institute sections

    Publication Year: 1931, Page(s): iv
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  • Geographical Location of Members Elected March 4, 1931

    Publication Year: 1931, Page(s):v - vii
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  • Applications for Membership

    Publication Year: 1931, Page(s):viii - ix
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  • Officers and Board of Direction, 1931

    Publication Year: 1931, Page(s): x
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  • Committees of the Institute of Radio Engineers 1931

    Publication Year: 1931, Page(s):xi - xiii
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  • Air view of Chicago [site of Sixth Annual Convention of the Institute]

    Publication Year: 1931, Page(s): 512
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  • Institute news and radio notes

    Publication Year: 1931, Page(s):513 - 527
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  • Diversity Receiving System of R.C.A. Communications, Inc., for Radiotelegraphy

    Publication Year: 1931, Page(s):529 - 561
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6032 KB)

    The early problems confronting the users of short wavelengths for communications are enumerated. Chief of these were fading and noise level. The phenomenon of fading is explained and the known methods of counteracting it are given. The most outstanding of these is the diversity principle. The various forms of this method are described and reasons developed for the choice of the particular form now... View full abstract»

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  • Diversity Telephone Receiving System of R.C.A. Communications, Inc.

    Publication Year: 1931, Page(s):562 - 584
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5648 KB)

    Difficulties encountered in the reception of high-frequency radio-telephone signals are described: the chief of these being fading and noise. General methods of solving these difficulties are discussed and the most desirable ones pointed out. The utilization of space diversity of fading is then taken up and methods of applying this principle to the reception of telephone signals are discussed. Thi... View full abstract»

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  • A Radio Beacon and Receiving System for Blind Landing of Aircraft

    Publication Year: 1931, Page(s):585 - 626
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10232 KB)

    A radio beacon and receiving system is described for use at airports to permit the blind landing of aircraft under conditions of no visibility. The system comprises three elements to indicate to the pilot the position of the aircraft as it approaches and reaches the instant of landing. Lateral position (that is, landing field runway direction) is given by a small directive beacon of the same type ... View full abstract»

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  • An Analysis of a Piezo-Electric Oscillator Circuit

    Publication Year: 1931, Page(s):627 - 646
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB)

    In this paper there is presented a mathematical analysis of a crystal "oscillator" circuit based on the suppositions: (a) that the oscillating crystal plate may be replaced by an equivalent electrical network; (b) that the "oscillation characteristic" of the tube may be represented by a three term nonlinear expression. The principal results are contained in an expression giving the resulting a-c p... View full abstract»

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  • Alternating-Current Measuring Instruments as Discriminators against Harmonics

    Publication Year: 1931, Page(s):647 - 654
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    Alternating-current measuring instruments are classified and a brief description of a method for obtaining each one of them is given. They are then discussed from the standpoint of the increase in reading which can be caused by harmonics added to the pure tones. It is shown that, under certain conditions, the linear detector may be superior to other forms of alternating-current instruments in that... View full abstract»

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  • Improvement of Thin Film Caesium Photo-Electric Tubes

    Publication Year: 1931, Page(s):655 - 658
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The photo-electric sensitivity of thin films of caesium deposited on silver oxide with silver as a base metal was studied by L. R. Koller. Photoelectric tubes with sensitive surfaces made in this manner have a maximum sensitivity in the short-wave range and also a second maximum in the red, with the long wavelength limit moving out into the infra-red. We have found that if a thin film of silver or... View full abstract»

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  • Direct-Reading Frequency Meter

    Publication Year: 1931, Page(s):659 - 663
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The frequency meter described functions over the whole scale of acoustic frequencies from 20 to 10,000 cycles per second, and in addition constitutes a static equivalent of the vibrating reed apparatus used for precise comparisons of a capacity with a resistance and a time. A condenser is charged at a given voltage E0across a triode in a half period and discharged across another triode ... View full abstract»

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  • A System for Suppressing Hum by a New Filter Arrangement

    Publication Year: 1931, Page(s):664 - 675
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    A new system for filtering the output of rectifiers or the commuttator ripple from generators is discussed, giving the mathematical design and showing the superiority in practical results as compared with standard systems. The system is based on the superposition of a current which has been shifted in phase by means of a wave-filter with one not displaced in phase. The method is also applicable to... View full abstract»

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  • Negative Circuit Constants

    Publication Year: 1931, Page(s):676 - 681
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A brief review of literature on devices furnishing negative resistance is made and further possibilities of development indicated New names are suggested for negative circuit constants. It is shown that for transient states the negative inductances and negative capacitances respond as would be expected of true negative circuit constants. External circuits are suggested to vary the negative resista... View full abstract»

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  • Corrections [to "Polyphase rectification special connections" and ["Calculation of electric and magnetic field strengths of any oscillating straight conductors"]

    Publication Year: 1931, Page(s): 682
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    Mr. R.W. Armstrong has brought to the attention of the editorial staff of the PROCEEDINGS a number of corrections to his paper "Polyphase Rectification Special Connections" which appeared on Page 78 of the January, 1931, issue of the PROCEEDINGS. They regard statements, tables and figures found on pages 81, 89, 94, and 95 of the original paper. The author, Mr. R. Bechmann, makes the following corr... View full abstract»

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  • Book review

    Publication Year: 1931, Page(s): 683
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  • References to current radio literature

    Publication Year: 1931, Page(s):684 - 691
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (885 KB)

    This is a list of references prepared by the US Bureau of Standards. It is intended to cover the more important papers of interest to professional radio engineers which have recently appeared in periodicals, books, etc. The number at the left of each reference classifies the reference by subject, in accordance with the scheme presented in "A Decimal Classification of Radio Subjects-An Extension of... View full abstract»

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  • Contributors to this issue

    Publication Year: 1931, Page(s):692 - 693
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Aims & Scope

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

Full Aims & Scope