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Radio Engineers, Proceedings of the Institute of

Issue 4 • Date April 1935

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  • [Front cover]

    Publication Year: 1935 , Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Publication Year: 1935 , Page(s): c2
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  • Contents

    Publication Year: 1935 , Page(s): i
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  • General Information

    Publication Year: 1935 , Page(s): ii
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  • Institute sections

    Publication Year: 1935 , Page(s): iii
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  • Geographical Location of Members Elected March 6, 1935

    Publication Year: 1935 , Page(s): iv
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  • Applications for Membership

    Publication Year: 1935 , Page(s): v
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  • Officers and Board of Directors

    Publication Year: 1935 , Page(s): vi
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  • Committees of the Institute of Radio Engineers, 1935

    Publication Year: 1935 , Page(s): vii - viii
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  • Institute news and radio notes

    Publication Year: 1935 , Page(s): 265 - 278
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  • The Application of Superheterodyne Frequency Conversion Systems to Multirange Receivers

    Publication Year: 1935 , Page(s): 279 - 294
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1640 KB)  

    In this paper certain problems involved in the application of the superheterodyne circuit to high frequencies are discussed. The effects of coupling between oscillator and radio-frequency circuits are considered, and it is shown that such coupling may occur as the result of space-charge variations in the converter tube. The problem of noise reduction is considered. The means recommended for improvement of high-frequency performance are the use of higher intermediate frequencies, special circuit arrangements to avoid undesired couplings, higher minimum L/C ratios in the high-frequency bands, and the use of sufficient radio-frequency amplification to minimize noise. View full abstract»

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  • A Study of Television Image Characteristics: Part Two: Determination of Frame Frequency for Television in Terms of Flicker Characteristics

    Publication Year: 1935 , Page(s): 295 - 310
    Cited by:  Papers (10)
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    During 1931 and 1932 an investigation was carried out to obtain quantitative information on the several characteristics of television images. Part One of this paper covered those characteristics relating to image detail. This paper, Part Two, covers a determination of frame frequency in terms of flicker characteristics. The analysis is based on a number of simple tests largely in terms of equivalents so that a wide range of conditions might be studied. Conclusions are reached regarding several means for minimizing flicker. View full abstract»

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  • General Considerations of Tower Antennnas for Broadcast Use

    Publication Year: 1935 , Page(s): 311 - 356
    Cited by:  Papers (17)
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    The factors influencing the action of towers when used as radiators are considered. It is shown that the results predicted from the simple theory of sinusoidal distribution of current on the tower differ to a major extent from the actual results. A series of measurements using small models of actual antenna structures resulted in data correlating closely with the performance of the full-sized structures. These measurements showed that departures from the simple theory are due to nonsinusoidal current distribution. Several types of recently installed antenna towers are shown to be less effective than the simple theory prediction, particularly with regard to reduction of sky wave and fading. Means for correcting the current distribution and thereby improving the performance are pointed out. The statement that low base capacity is essential to high antenna efficiency is shown to be a fallacy providing simple precautions are taken to reduce conduction losses. The ground system and earth currents are considered from both a theoretical and experimental viewpoint. A simple method of measuring the earth currents is described and it is pointed out that such measurements indicate whether the antenna current is sinusoidal or not. Appendix A gives a method of computing the radiation characteristics and the radiation resistance when the current distribution is known but is not expressed analytically. Appendix B contains the theory behind the ground current measurements. Appendix C shows the influence of the base insulator capacitance on the operating characteristics. View full abstract»

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  • Experiments with Directivity Steering for Fading Reduction

    Publication Year: 1935 , Page(s): 357 - 371
    Cited by:  Papers (5)
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    Short-wave fading is largely due to phase interference between multiple path signals of varying path length. Fortunately, stable angular differences usually exist between these paths at the point of reception. It is therefore desirable to employ antenna directivity which is "steerable" and sufficiently sharp to accept only one of the several paths in order to reduce this fading. This paper describes experiments made with a "steerable" directive antenna during reception of transoceanic short-wave signals. The results demonstrate that sharp angular discrimination is a basically sound method of combating fading which is due to phase interference. View full abstract»

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  • Steel-Cylinder Grid-Controlled Mercury-Arc Rectifiers in Radio Service

    Publication Year: 1935 , Page(s): 372 - 379
    Cited by:  Papers (1)
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    This article describes a steel-cylinder grid-controlled mercury-arc rectifier as applied to radio transmitting service. The various parts of the rectifier cylinder are pointed out with reference to a picture of the rectifier unit. The use of mercury seals is described, and the operation of various auxiliaries such as vacuum pumps, vacuum meter, and ignition-excitation equipment is dealt with. Particular reference is made to the use of grid control for deionizing the anodes after carrying current, regulation of the direct-current output voltage, ultra-high speed electronic circuit breaker protection of the rectifier and radio transmitter equipment, and inversion of electrical energy stored in the filter system during the interruption of short circuits. The operation of the grid-control protective circuit as compared to that of an alternating-current oil circuit breaker in interrupting direct short circuits is illustrated by means of oscillograph records. View full abstract»

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  • The Quadrature Oscillograph: An Electromechanical Device Having Two Degrees of Freedom

    Publication Year: 1935 , Page(s): 380 - 385
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    An electromechanical oscillograph galvanometer has been developed which is capable of deflection along two mutually perpendicular sets of coordinate axes. For power and low audio frequencies, the instrument presents all of the possibilities inherent in a deflecting system of two degrees of freedom. View full abstract»

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  • A Determination of Some of the Properties of the Piezo-Electric Quartz Resonator

    Publication Year: 1935 , Page(s): 386 - 392
    Cited by:  Papers (3)
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    Entirely consistent determinations of the logarithmic decrement of X-cut quartz rods whose natural frequencies are of the order of seventy kilocycles have been obtained during the last few years. The decrement is obtained from measurements on oscillographic records of the decay of the free vibrations of the resonator. The most extreme (lowest) values of decrement have been checked by an entirely independent method; namely, by tracing the resonance curve, the agreement between the two methods being to within a few per cent. Extended studies by the former method have shown the logarithmic decrement to be a linear function of the pressure of the surrounding gas, and the energy losses in the two gases tried, air and hydrogen, to be in the ratio of their radiation resistances. This assumes previous elimination of mounting losses, which for ordinary mountings are even larger than radiation losses. When radiation losses have been eliminated, the effect of the abrasive used in making the usual ground finish of the surfaces of the quartz becomes obvious, the lowest decrements being obtained when the surfaces have been etched. Representative decrements measured under various conditions are as follows, the corresponding reactanceresistance-ratio Q being inserted in parentheses following each logarithmic decrement. Ground surfaces, in air at atmospheric pressure, 126×10-6(25,000) Ground surfaces, in hydrogen at atmospheric pressure, 31×10-6(101,000) Ground surfaces, in vacuum, 11-17×10-6(290,000-180,000) Etched surfaces, in vacuum, 6.4×10-6(490,000) Etched surfaces, polished, in vacuum, 5. View full abstract»

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  • Book reviews

    Publication Year: 1935 , Page(s): 393 - 394
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  • Bookelts, catalogs, and pamphlets received

    Publication Year: 1935 , Page(s): 395
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  • Contributors to this issue

    Publication Year: 1935 , Page(s): 396
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Aims & Scope

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

Full Aims & Scope