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Proceedings of the Institute of Radio Engineers

Issue 7 • Date July 1930

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  • [Front cover]

    Publication Year: 1930, Page(s): c1
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  • Tentative Program of Fifth Annual Convention Institute of Radio Engineers, Toronto, Ont., Canada, August 18-21, 1930

    Publication Year: 1930, Page(s): c2
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  • Contents

    Publication Year: 1930, Page(s): i
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  • General Information

    Publication Year: 1930, Page(s): ii
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  • Suggestions for Contributors to the Proceedings

    Publication Year: 1930, Page(s): iii
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  • Institute sections

    Publication Year: 1930, Page(s): iv
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  • Geographical Location of Members Elected June 11, 1930

    Publication Year: 1930, Page(s):v - vii
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  • Applications for Membership

    Publication Year: 1930, Page(s):viii - ix
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  • Officers and Board of Direction, 1930

    Publication Year: 1930, Page(s): x
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  • Michael I. Pupin

    Publication Year: 1930, Page(s):1098 - 1099
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  • Institute news and radio notes

    Publication Year: 1930, Page(s):1100 - 1119
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  • Inaugural Address of Dr. Lee De Forest

    Publication Year: 1930, Page(s):1121 - 1127
    Cited by:  Papers (1)
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  • Ultra-Short Waves for Limited Range Communication

    Publication Year: 1930, Page(s):1128a - 1143
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1904 KB)

    Experiments on short-distance communication using a wave-length of two meters together with details of equipment used are described. A range of over 12 miles was obtained with a super-regenerative receiver. The advantages of a limited-range short-wave system for certain maritime and other purposes are listed. View full abstract»

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  • A Radio-Frequency Potentiometer

    Publication Year: 1930, Page(s):1144 - 1154
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    A potentiometer has been developed for the measurement of the amplitude and phase of voltages at frequencies up to at least 106Cycles per sec. Two slide wires are used which carry currents whose phases are approximately in quadrature. A method of standardizing the instrument is described, that is, of determining the relative phase and ratio of amplitude of the currents carried by the tw... View full abstract»

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  • Whistling Tones from the Earth

    Publication Year: 1930, Page(s):1155 - 1159
    Cited by:  Papers (4)
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  • The Calculation of the Service Area of Broadcast Stations

    Publication Year: 1930, Page(s):1160 - 1193
    Cited by:  Papers (12)
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    This paper is a comprehensive study of the practical considerations in the determination of the field strength laid down at any distance by a given radio station at any given location. All factors entering into such calculations are considered and practical means of their determination or estimation set forth. Methods are provided for the evaluation of field strength due to the space ray which sho... View full abstract»

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  • Frequency Modulation

    Publication Year: 1930, Page(s):1194 - 1205
    Cited by:  Papers (61)
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    The differential equation of a frequency modulated transmitter is considered and the expression of the current as a function of time is derived. Frequency analysis of this function is made for two specific cases, (A) sinusoidal frequency modulation (telephony) and (B), right-angle frequency modulation (telegraphy with "marking" and "spacing" wave). The distribution and amplitudes of the frequencie... View full abstract»

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  • Effect of Cavity Resonance on the Frequency Response Characteristic of the Condenser Microphone

    Publication Year: 1930, Page(s):1206 - 1215
    Cited by:  Papers (6)
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    The effect of the cavity before the membrane in the usual condenser microphone is to cause an increase of pressure at the membrane over that which exists in the undisturbed (free) sound-field, particularly at high frequencies. An approximate theory of the effect is given and a specimen case is calculated. In this case the pressure ratio reaches a maximum of 2.5 at 3000 cycles. Experimental values ... View full abstract»

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  • Locating Radio Interference with the Oscillograph

    Publication Year: 1930, Page(s):1216 - 1225
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    Certain kinds of radio interference travel many miles over wires and cause trouble in radio reception. Often this interference originates on one system which is coupled to another and, because of complaints, the interference investigation is started from a point near the second system. The usual methods of locating the trouble are not very effective in such cases. The oscillographic method analyze... View full abstract»

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  • The Variation of the Resistance of a Radio Condenser with Capacity and Frequency

    Publication Year: 1930, Page(s):1226 - 1230
    Cited by:  Papers (1)
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  • Wireless Telegraphy and the Ionization in the Upper Atmosphere

    Publication Year: 1930, Page(s):1231 - 1238
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    A non-mathematical survey is given of the theory of the upper atmosphere and the behavior of wireless waves. The new physics of the atmosphere based on heating by the sun, cooling at night, winds, gaseous diffusion, etc., the observations of the heights reached by wireless waves, the skip distances, ranges, polarization, etc., led to the conclusion that the ionization in the upper atmosphere was c... View full abstract»

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  • Design of a Portable Temperature-Controlled Piezo Oscillator

    Publication Year: 1930, Page(s):1239 - 1246
    Cited by:  Papers (4)
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    This paper describes the essential details of a portable shielded temperature-controlled piezo oscillator constant in frequency to better than one part in 100,000. The quartz plate is mounted in a special plate holder so that the air-gap changes very little as the quartz plate shifts in the holder. The plate holder is mounted in a thermal-attenuating chamber consisting of a copper cylinder and lay... View full abstract»

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  • Electroelastic and Pyro-Electric Phenomena

    Publication Year: 1930, Page(s):1247 - 1262
    Cited by:  Papers (1)
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  • Discussion on Some Possibilities of Intelligence Transmission When Using a Limited Band of Frequencies

    Publication Year: 1930, Page(s):1263 - 1265
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  • Book review

    Publication Year: 1930, Page(s):1266 - 1267
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Aims & Scope

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

Full Aims & Scope