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Radio Engineers, Proceedings of the Institute of

Issue 11 • Date Nov. 1931

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  • [Front cover]

    Publication Year: 1931 , Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    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 October 7, 1931

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

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

    Publication Year: 1931 , Page(s): ix
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  • John Hays Hammond - Treasurer of the Institute, 1914

    Publication Year: 1931 , Page(s): 1896
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  • Institute news and radio notes

    Publication Year: 1931 , Page(s): 1897 - 1907
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  • The Adjustment of the Multivibrator for Frequency Division

    Publication Year: 1931 , Page(s): 1909 - 1917
    Cited by:  Papers (5)
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    In a multivibrator controlled by a voltage of another frequency bearing a harmonic relationship to the multivibrator frequency, the effect of varying the control voltage is analyzed, and a method for determining the best value of this voltage is described. Methods of coupling the control voltage are shown in which frequency division by an odd integer will occur more readily than by an even integer, and vice versa. View full abstract»

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  • New Methods of Frequency Control Employing Long Lines

    Publication Year: 1931 , Page(s): 1918 - 1930
    Cited by:  Papers (5)
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    The practical difficulties encountered in commercial operation of short-wave transmitters, due to the great number of radio-frequency stages required for crystal control, are summarized. The objections to crystal control for some transmitters operated on frequencies above 35,000 kilocycles are given. Methods are described for meeting these objections through frequency control by long radio-frequency transmission lines, which have inherently large volt-ampere capacity and which make possible a considerable reduction in operating costs and improvement in reliability. Methods for applying the lines to the control of oscillator frequencies by using them as relatively constant low power factor resonant circuits and as aperiodic means for feeding regenerative energy from anode circuits to grid circuits are described. A method is given for obtaining both the advantages of crystal oscillators as frequency standards and the economies and reliability of long line transmitter frequency control. Applications of the methods described to experimental and commercial transmitters are mentioned. View full abstract»

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  • Some Observations of the Behavior of Earth Currents and Their Correlation with Magnetic Disturbances and Radio Transmission

    Publication Year: 1931 , Page(s): 1931 - 1947
    Cited by:  Papers (1)
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    This paper presents correlations between the abnormal earth currents noted during magnetic storms and transoceanic radio transmission on both long and short waves. The radio transmission data were collected on the telephone circuits operating between New York and London and between New York and Buenos Aires. The earth current data were collected on two Bell System lines extending approximately a hundred miles north and west from New York. The results of this work establish facts which have been known in a general way for some time. The direction of flow of abnormal earth currents in the neighborhood of New York seems to be along a northwest-southeast line. Coincident with such abnormal currents are periods of poor short-wave radio transmission. However, on long waves, daylight transmission over transatlantic distances is improved. On the short-wave circuit to Buenos Aires, transmission is adversely affected but only to a moderate extent. View full abstract»

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  • Development of a Circuit for Measuring the Negative Resistance of Pliodynatrons

    Publication Year: 1931 , Page(s): 1948 - 1950
    Cited by:  Papers (2)
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    Pliodynatron oscillators are assuming greater importance in engineering work. As the value of the negative resistance of a tube having dynatron characteristics is a measure of its utility it was necessary to design a test circuit which would quickly and accurately measure this property without recourse to the older and more laborious method of plotting the Ep-Ip, curve of the tube and calclulating its negative slope over the operating range. The test circuit is an adaptation of the Wheatstone bridge. View full abstract»

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  • Methods for Measuring Interfering Noises

    Publication Year: 1931 , Page(s): 1951 - 1954
    Cited by:  Papers (1)
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    This paper outlines various methods of measuring interference, particularly in radiotelephony, which have been found useful in the Bell System. View full abstract»

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  • The Broadcast Installations in the New "House of Radio"

    Publication Year: 1931 , Page(s): 1955 - 1970
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    In January, 1931, the new "House of Radio," Berlin-Charlottenburg, Masurenallee, was opened. The broadcast equipment there partly consists of installations of novel design, and is described herein in a detailed manner. View full abstract»

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  • Vacuum Tubes as High-Frequency Oscillators

    Publication Year: 1931 , Page(s): 1971 - 1982
    Cited by:  Papers (7)
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    The problem of tubes for generating power at wavelengths below five meters is discussed. The theory of the triode and split-anode magnetron is considered with particular reference to the limitations imposed by operation at short wavelengths. Essential data are given for examples of each type of tube, showing the power that can be obtained at various wavelengths. View full abstract»

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  • Formation of Standing Waves on Lecher Wires

    Publication Year: 1931 , Page(s): 1983 - 1987
    Cited by:  Papers (1)
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    With a short review of the work on the Lecher wire method of wavelength measurement, this paper describes in detail the wave form of current distribution along wires under a variety of terminal conditions of length and impedances. View full abstract»

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  • Polarization Phenomena of Low-Frequency Waves

    Publication Year: 1931 , Page(s): 1988 - 1999
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    In this paper, the writer outlines the experiments of determining the state of polarization of a downcoming wave by using a cathode-ray oscillograph of Braun-tube type. Observations have been made at the Hiraiso Radio Laboratory near Tokyo for the transmissions of JAA and JND, both of which are the high power low-frequency transmitting stations located at a short distance (about 150 and 360 km respectively) away from the laboratory. The writer summarizes from the results of a series of observations that a downcoming wave is usually in a state of linear polarization during the daytime, and a sudden change occurs at sunset, the wave being changed into an elliptically polarized state, and that the wave transmitted from the station JAA located north of the laboratory is almost always in the state of left-handed polarization at night, while that transmitted from the station JND located west is nearly in the state of linear polarization during both day and night. View full abstract»

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  • Polarization of High-Frequency Waves and Their Direction Finding

    Publication Year: 1931 , Page(s): 2000 - 2019
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    This paper describes the results of experiments which were conducted during the past two years for the purpose of studying the high-frequency transmission phenomena, and some physical explanations deduced therefrom. The authors are of opinion that it is preferable to take up the questions of polarization and direction finding simultaneously. For the measurements of polarization, the authors. used a single doublet which may be rotated in the directions of three coordinates, and measured the component electric forces by it. For direction measurements, they used an Adcock-type aerial which was specially designed by themselves so as to be suitablefor the observations on high-frequency waves. The conclusions thus obtained are briefly summarized as follows: (1) The waves are, as a whole, elliptically polarized, and in general the state of polarization largely depends on the transmission distance. When the distance is short, the state of polarization will usually be horizontal, whereas it is generally vertical when the distance is long. In either case, the direction measurement is satisfactory. (2) Within a certain distance, the direction measurement is impossible owing to the scattering of the waves. (3) If transmitter and receiver are so situated as to be in nearly antipodal relation, the main waves do not always propagate along the great circle path, but take various routes according to the distribution of day and night. View full abstract»

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  • The Use of Rochelle Salt Crystals for Electrical Reproducers and Microphones

    Publication Year: 1931 , Page(s): 2020 - 2029
    Cited by:  Papers (15)
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    The paper begins with a brief historical résumé of the development of piezo activity for acoustic uses. References are given. Methods developed by the author and his associates permit the cheap commercial production of Rochelle salt crystals and sections thereof, but the saturation and variation with temperature of Rochelle salt (shown in diagrams) must be compensated for by special assemblies of the Rochelle salt sections. The underlying principle of the special assemblies is that of mutual opposition with resultant magnification of motion. This principle of opposition may be utilized to produce bending or twisting elements of Rochelle salt of great simplicity. Such elements may then be combined with appropriate acoustic members to operate with great sensitivity and efficiency in either an input or output circuit. Rochelle salt requires no exciting field of any sort, which property results in the elimination of the necessity for any external excitation. Microphones, pick-ups, and especially speakers are described, with some discussion of limiting conditions of load, temperature, and other operating conditions. The article concludes with a tabulated summary of advantages offered by the use of Rochelle salt sections. View full abstract»

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  • Discussion "On the Amplitude of Driven Loud Speaker Cones"

    Publication Year: 1931 , Page(s): 2030 - 2034
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  • Book reviews

    Publication Year: 1931 , Page(s): 2035
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  • Booklets, catalogs, and pamphlets received

    Publication Year: 1931 , Page(s): 2036 - 2037
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Aims & Scope

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

Full Aims & Scope