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Proceedings of the IRE

Issue 11 • Date Nov. 1939

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Displaying Results 1 - 22 of 22
  • [Front cover]

    Publication Year: 1939 , Page(s): c1
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  • Rochester Fall Meeting

    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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  • Asymmetric-Sideband Broadcasting

    Publication Year: 1939 , Page(s): 687 - 690
    Cited by:  Papers (1)  |  Patents (1)
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    There is described a method of radio transmission designed to economize frequency space in broadcasting, wherein one sideband and the carrier are transmitted, together with the lower audio-frequency components of the other sideband. By retaining the lower frequencies of the second sideband there is minimized the distortion to which pure single sideband gives rise in the types of broadcast receivers now generally used. Instead of first setting up the usual double-sideband transmission and then filtering out the undesired high-frequency components of one sideband, the asymmetrical spectrum is produced by combining a double-sideband modulation of the lower frequencies only with a single sideband of the upper range of frequencies. Details of an experimental application of the method are given. View full abstract»

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  • Stroboscopic-Light Source

    Publication Year: 1939 , Page(s): 690 - 692
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    A description of a high-speed stroboscope is given. A blocking-oscillator circuit is used to produce short pulses of several amperes of anode current in a high-vacuum tube, the anode of which is coated with fluorescent material. View full abstract»

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  • Transatlantic Reception of London Televison Signals

    Publication Year: 1939 , Page(s): 692 - 695
    Cited by:  Papers (1)
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    The results of daily observations at Riverhead, L.I., N.Y., since September, 1938, of the English television transmissions on 41.5 and 45.0 megacycles are summarized and discussed. A photograph of one of the television images received during this period is shown. A résumé is made of the signal strengths observed since January, 1937. During each winter of this period signal strengths of between 10 and 500 microvolts per meter were frequently received. View full abstract»

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  • Static Emanating from Six Tropical Storms and Its Use in Locating the Position of the Disturbance

    Publication Year: 1939 , Page(s): 696 - 700
    Cited by:  Papers (2)
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    This paper describes the technique of locating the apparent source of atmospherics employing several stations located at a considerable distance from each other and equipped with cathoderay-tube direction finders. It discusses the data obtained on six tropical storms and compares the results with the estimate of the positron of the storm center as reported on the daily bulletins of the United Stes Weather Bureau. It presents some evidence of close connection between static and meteorological conditions. It suggests that further studies should be made along the same or similar lines to establish the feasibility of this method for locating the center of tropical storms by means of their associated static. View full abstract»

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  • The Solar Cycle and the F2Region of the Ionosphere

    Publication Year: 1939 , Page(s): 701 - 703
    Cited by:  Papers (1)
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    This paper presents a method of analyzing F2-region critical-frequency data in a way that shows in a clear-cut manner the correlation that exists between monthly average values of these critical frequencies for undisturbed days and solar activity as measured by the central-zone character figures for calcium flocculi. Curves are presented which show for each month the expected diurnal variation of f0f2 for two values of solar activity. Other curves show for a number of different hours the expected seasonal variation of f0F2 at a constant time of day for the same values of solar activity. View full abstract»

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  • Basic Economic Trends in the Radio Industry

    Publication Year: 1939 , Page(s): 704 - 715
    Cited by:  Papers (2)
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    This paper considers the American radio industry from the standpoint of its long-time economic trends, with special reference to the past and probable future public demand for broadcast receivers and vacuum tubes. The history of the anuual sales to each of the various markets for these is analyzed, equations are given for their long-time growth trends, and estimates of growth are projected ahead to 1947. Conclusions are stated regarding the probabilities of changes in the nature of the demand for initial and replacement receivers in the form of primary, secondary, automobile, and export receivers; and for vacuum tubes for initial equipment or replacement purposes. View full abstract»

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  • The Application of Low-Frequency Circuit Analysis to the Problem of Distributed Coupling in Ultra-High-Frequency Circuits

    Publication Year: 1939 , Page(s): 715 - 724
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2048 KB)  

    The general problem of coupling between circuits which extend beyond the near zone is investigated theoretically. Integrals defining generalized coefficients of inductance are displayed and discussed for the case of the near zone and in general. As an application, the specific problem of determining the current distribution in two coupled circuits which extend beyond the near zone is examined, and solved for the special case of two loosely coupled sections of parallel line. It is proved that the electromotive force induced in the secondary by the primary oscillator may be treated as though concentrated at a point opposite the center of the oscillator provided the current distribution in the oscillator is symmetrical with respect to this center. The conclusions are generalized to include other circuits than the parallel line, in particular an antenna coupled to a symmetrical oscillator. Experimental curves are shown which verify the general theory. View full abstract»

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  • Television Detail and Selective-Sideband Transmission

    Publication Year: 1939 , Page(s): 725 - 732
    Cited by:  Papers (7)  |  Patents (5)
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    Recently selective-sideband transmission has been adopted in this country in order to increase the picture detail which can be transmitted in a frequency channel of given width. The present analysis is an examination of the theoretical justification for this practice. The effect of various degrees of unequal-sideband transmission on typical television signals is calculated by Fourier integral analysis. The conclusions reached are as follows: (1) For small percentages of modulation and small changes in the percentage of modulation selective-sideband transmission is equivalent to double-sideband transmission of twice the frequency pass band. (2) For large changes in the percentage of modulation, selective-sideband transmission is equivalent to double-sideband transmission of twice the frequency pass band for the reproduction of symmetrical fine detail. However, at the edges of patterns where there is a great change of visual intensity, selective-sideband transmission introduces more or less false detail, not present in the original signal. The extent of this false detail increases with the sharpness of the rise of the frequency characteristic at the edge of the transmission band where the carrier is located. View full abstract»

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  • The Anode-Tank-Circuit Magnetron

    Publication Year: 1939 , Page(s): 732 - 738
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2928 KB)  

    A new type of magnetron is described in which the split cylindrical anode is made approximately one-quarter wave in length, the two segments being short-circuited at one end. The anode resonates and acts as a tank circuit. Thus difficulties due to interelectrode capacitance and tube lead inductance are circumvented and a much greater heat radiating area is provided. An output of 20 watts at 3750 megacycles (8 centimeters wavelength) and an efficiency of 22 per cent is obtainable. The theory of the anode tank circuit is developed, and expressions are given for wavelength, internal resistance, and logarithmic decrement. View full abstract»

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

    Publication Year: 1939 , Page(s): 739 - 740
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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): 741 - 744
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  • Books

    Publication Year: 1939 , Page(s): 744
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  • Contributors

    Publication Year: 1939 , Page(s): 745 - 746
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  • Current Literature

    Publication Year: 1939 , Page(s): iv
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  • Booklets, catalogs and pamphlets

    Publication Year: 1939 , Page(s): iv
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  • Engineering directory [advertisement]

    Publication Year: 1939 , Page(s): viii
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  • Index [to advertisers]

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

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

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

Full Aims & Scope