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Radio Engineers, Proceedings of the Institute of

Issue 5 • Date Oct. 1923

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Displaying Results 1 - 13 of 13
  • [Front cover]

    Publication Year: 1923 , Page(s): c1
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  • Contents

    Publication Year: 1923 , Page(s): 457
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  • General Information

    Publication Year: 1923 , Page(s): 457
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  • Officers and Board of Direction, 1923

    Publication Year: 1923 , Page(s): 458
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  • Observations on Lafayette and Nauen Stations in Washington, March 1, 1922, to February 28, 1923

    Publication Year: 1923 , Page(s): 459 - 465
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    The results of one year's observations of the signal strength at Washington, of the Lafayette Station (23,400 m.) and the Nauen Station (12,500 m.) and of atmospheric disturbances are given in tabular form and discussed. The relative usefulness of these two wave lengths for continuous communications is analyzed. View full abstract»

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  • A Method of Measuring Very Short Radio Wave Lengths and Their Use in Frequency Standardization

    Publication Year: 1923 , Page(s): 467 - 478
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    The paper describes one method of establishing frequency standards employed by the Bureau of Standards which is based on the direct measurement, in linear measure, of the wave length of very short standing waves on a pair of parallel wires. The wave lengths measured were from 9 to 16 meters, the currents having frequencies from 33,000 to 19,000 kilocycles per second. The apparatus for generating these ultra radio-frequency currents is described, as well as the details of the method used in measuring the wave length of the waves which they produce on the parallel wires. A method is described for calibrating a wavemeter at frequencies from 30,000 kilocycles to 352 kilocycles (10 to 850 meters). This method makes use of the harmonics in a second radio-frequency generating set, one of which, when combined with the output from the ultra radio-frequency generating set, produces a beat note in a receiving set tuned to the ultra radio-frequency. The zero beat note method is used to obtain an exact setting. Knowing the frequency of the ultra radio-frequency generating set by direct measurement on the parallel wires, and the order of the different harmonics being used in the second radio-frequency generating set, the frequency of the latter may be determined over the range from 30,000 kilocycles to 352 kilocycles (10 to 850 meters). View full abstract»

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  • An Improved System of Modulation in Radio Telephony

    Publication Year: 1923 , Page(s): 479 - 492
    Cited by:  Papers (1)
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    After describing the commonly employed absorption and constant current systems of radio telephone modulation, the author discusses a system of modulation wherein the resistance in the grid circuit of the power oscillator tubes is vocdly varied, this resistance being itself the plate circuit of a suitable vacuum tube. Operating data on sets embodying this method are given. View full abstract»

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  • Discussion

    Publication Year: 1923 , Page(s): 493
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  • Radio Frequency Tests on Antenna Insulators

    Publication Year: 1923 , Page(s): 495 - 522
    Cited by:  Papers (1)
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    After analyzing the design considerations for high voltage radio frequency continuous wave antenna insulators, there are given data on the heating, losses, and flashover points of a number of sizes and forms of porcelain rod insulators, both dry and wet. The effect of rain shields, electro-static strain shields, and "breathers" on the behavior of the insulators is discussed. The voltage distribution across insulators in series was determined. Its effects on design are given. A study of visual corona point on conductors at radio frequencies is included. View full abstract»

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  • Discussion

    Publication Year: 1923 , Page(s): 523 - 525
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  • Vacuum Tubes as Power Oscillators (Part III)

    Publication Year: 1923 , Page(s): 527 - 550
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    Chapter VI. In the "master oscillator" or "power amplifier" circuit oscillations are generated by a small power source and then amplified. In the amplifier there is no definite phase relationship between plate and grid potentials. The phase is determined by the tuning of input and output circuits. The effect of variations in grid and plate circuit tuning upon output and losses is developed for both direct coupling to the antenna circuit and coupling thru an intermediate circuit. Chapter VII It is shown by the general method of Chapter I that considerable increases in both efficiency and tube output can be obtained by introducing harmonics into the plate voltage wave. The purpose of these harmonics is to flatten the top of the wave so that tube losses may be maintained at a minimum value during a large part of the time during which current is flowing. Appendix-The general explanations of vacuum tube phenomena are supplemented by more detailed data giving the correspondence between theoretical, ideal, and actual values for emission and space charge. The theory of division of primary electrons between grid and plate when both are positive is explained. The effects of secondary emission in producing blocking and influencing efficiency are discussed. View full abstract»

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  • The efficiency of three-electrode tubes used for the production of continuous waves in radio telegraphy, that is, for the conversion of direct current into alternating current

    Publication Year: 1923 , Page(s): 551 - 558
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    The theoretical limiting efficiencies of vacuum tube oscillators, for various wave forms of plate current, are mathematically investigated and discussed. View full abstract»

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  • Digests of United States Patents relating to radio telegraphy and telephony

    Publication Year: 1923 , Page(s): 559 - 575
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Aims & Scope

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

Full Aims & Scope