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Radio Engineers, Proceedings of the Institute of

Issue 8 • Date Aug. 1938

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

    Publication Year: 1938 , Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Publication Year: 1938 , Page(s): c2
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  • Contents

    Publication Year: 1938 , Page(s): i
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  • General Information

    Publication Year: 1938 , Page(s): ii
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  • Institute sections

    Publication Year: 1938 , Page(s): iii
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  • Geographical Location of Members Elected July 6, 1938

    Publication Year: 1938 , Page(s): iv
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  • Applications for Membership

    Publication Year: 1938 , Page(s): v
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  • Officers and Board of Directors

    Publication Year: 1938 , Page(s): vi
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  • John C. Warner, 1896-1938

    Publication Year: 1938 , Page(s): 918
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  • Institute news and radio notes

    Publication Year: 1938 , Page(s): 919 - 928
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  • A High-Efficiency Grid-Modulated Amplifier

    Publication Year: 1938 , Page(s): 929 - 945
    Cited by:  Papers (2)
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    A method of applying impedance inversion to the grid-modulated amplifier is described. Two tubes are employed in the modulated stage with their plate circuits connected through the electrical equivalent of a quarter-wave transmission line, and the modulating voltage is applied to the grids in series with the grid bias. By this means, high efficiency and large power output per tube are obtained. Ef... View full abstract»

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  • A Unique Method of Modulation for High-Fidelity Television Transmitters

    Publication Year: 1938 , Page(s): 946 - 962
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3344 KB)  

    Present-day high-fidelity 441-line television demands modulation frequencies as high as 4 megacycles. Tube capacitance and the flywheel effect of resonant circuits make such modulation difficult and inefficient when conventional methods are used. The author describes a system called "transmission-line modulation" in which modulation is effected between the radio-frequency generator and the antenna... View full abstract»

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  • High-Efficiency Modulation System

    Publication Year: 1938 , Page(s): 963 - 982
    Cited by:  Papers (3)
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    A descriptive and mathematical treatment is given of a means for obtaining modulated radio-frequency power with good conversion efficiency from the usual direct-current source. The method employed is to modify the load line on a saturated radio-frequency amplifier to take care of positive peaks and to grid modulate the amplifier for negative peaks. Load modification is accomplished by absorption a... View full abstract»

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  • A Phase-Opposition System of Amplitude Modulation

    Publication Year: 1938 , Page(s): 983 - 1008
    Cited by:  Papers (3)  |  Patents (46)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2064 KB)  

    The increasing economic importance of power efficiency for high-power broadcast stations is illustrated in Fig. 1 showing that some 50 per cent saving is possible. Different known modulation schemes are compared as regards necessary input power, including the recent Chireix and Doherty systems. The influence of rates for electric power is stressed. A so-called "phase-opposition" system is discusse... View full abstract»

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  • Notes on the Impedance of a Carbon Microphone

    Publication Year: 1938 , Page(s): 1009 - 1010
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    First Page of the Article
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  • The Causes for the Increase of the Admittances of Modern High-Frequency Amplifier Tubes on Short Waves

    Publication Year: 1938 , Page(s): 1011 - 1032
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2456 KB)  

    By recent measurements of input loss, output loss, and feed-back capacitance of modern high-frequency amplifier tubes (pentodes) up to 300 megacycles, a considerable increase of these values in the short-wave range has become manifest. Contrary to the opinion, expressed in several recent publications, for many types of valves the main cause of this increase must not be sought in electron-transit-t... View full abstract»

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  • Characteristics of the Ionosphere at Washington, D.C., June, 1938

    Publication Year: 1938 , Page(s): 1033 - 1036
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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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  • Booklets, catalogs and pamphlets received

    Publication Year: 1938 , Page(s): 1037
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  • Contributors to this issue

    Publication Year: 1938 , Page(s): 1038
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Aims & Scope

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

Full Aims & Scope