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Radio Engineers, Proceedings of the Institute of

Issue 7 • Date July 1936

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  • [Front cover]

    Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Page(s): c2
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  • Contents

    Page(s): i
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  • General Information

    Page(s): ii
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  • Institute sections

    Page(s): iii
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  • Geographical Location of Members Elected June 3, 1936

    Page(s): iv - v
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  • Applications for Membership

    Page(s): vi - vii
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  • Officers and Board of Directors

    Page(s): viii
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  • Eleventh Annual Convention Committee

    Page(s): 948
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  • Institute news and radio notes

    Page(s): 949 - 958
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  • Errata

    Page(s): 958
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  • Rain Static

    Page(s): 959 - 963
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    The problem of rain static, particularly as it affects aircraft, is treated. Rain static is due to particles of rain, snow, or dust striking aircraft antennas. It has been found that the disturbance is electrostatic in origin and that an electrostatically shielded loop antenna reduces it materially. View full abstract»

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  • Modes of Oscillation in Barkhausen-Kurz Tubes

    Page(s): 964 - 976
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    Experiments are described in which "parasitic" oscillations are elicited, and suppressed, in a generator of the Barkhausen-Kurz type by means of either voltage or circuit adjustments. The performance of tubes of new design employing a straight filament, helical grid, and cylindrical plate cut transversely into three sections is described, and the bearing of the experimental results on the problem of the modes of oscillation of the resonating grid oscillator is indicated. A method of stabilizing frequency by the use of such tubes in conjunction with a tuned transmission line is given. View full abstract»

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  • High Voltage Mercury-Pool Tube Rectifiers

    Page(s): 977 - 984
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    Mercurypool tubes of the ignitron type offer attractive features for power rectifier service. This paper discusses the application of this type to controlled high voltage, high power rectifiers for radio transmitters, and some problems peculiar to their use as such. A developmental rectifier of this type, which has been in trial operation, is described. View full abstract»

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  • Recent Developments of the Class B Audio- and Radio-Frequency Amplifiers

    Page(s): 985 - 1006
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    Class B audio-frequency and radio-frequency amplifiers have many applications and the distortion can be kept to a very low value if the necessary precautions are taken to prevent nonlinearity of such amplifiers. Undoubtedly, the most important factor in the design of a class B amplifier for low distortion is the characteristic of the driver system. Tube characteristics and the use of a proper load are also important but are more definite and more generally understood. The purpose of this paper is to present the results of recent developments of the class B audio and radio amplifiers to reduce distortion. The results of the investigations indicate that a heavily loaded driver system in general is undesirable because of the power consumed and because such loading results in greater distortion than obtainable by other means. The general procedure adopted to reduce distortion was to prevent distortion in each unit of the amplifier system. Distortion balancing schemes are not only critical to adjust but are likely to introduce higher order harmonics and sum and difference tones which may be more objectionable than a higher measured value of lower order harmonics. Actual performance data are presented for medium and relatively high powered audio and radio systems. The necessary input requirements to permit the performance obtained are discussed. Sufficient theory is given to make the paper complete and to show that the actual performance of such amplifiers can be quite accurately predicted if the necessary tube characteristics are known. View full abstract»

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  • General Theory and Application of Dynamic Coupling in Power Tube Design

    Page(s): 1007 - 1026
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    This paper presents a simplified method of driving a power tube without the need of coupling devices and grid-biasing means. The power section is one whose useful plate-current versus grid-voltage characteristic is realized only with positive values of grid voltage. Its low input impedance is in series with the cathode-ground circuit of the driver tube. This impedance, also, automatically provides a negative bias for the grid of the driver, thereby eliminating external biasing. Since the electronic coupling of the two tubes varies with signal excursions, this method of amplification is termed "dynamic coupling." Practical considerations show immediately that the driver must operate into an impedance which is considerably lower than its own plate impedance. It is shown that the distortion which is produced when working with such ratios is minimized partly by making the driver circuit degenerative in order to nullify the varying effect of the driver's mu. This is treated first with a pure resistive load. When the grid impedance is the load, a further reduction in distortion is shown, for then the ratio of plate-to-load impedance remains more nearly constant throughout a signal excursion. The remaining part of the paper deals with a commercial application of these principles. Certain design considerations for a tube embodying both driver and power sections are discussed. A current surge phenomenon caused by secondary emission is discussed and a practical means for its elimination is given. The delayed point at which the driver's grid begins drawing current is shown to be particularly advantageous. View full abstract»

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  • Ionosphere Studies during Partial Solar Eclipse of February 3, 1935

    Page(s): 1027 - 1040
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    Virtual height and critical frequency measurements of the several regions of the ionosphere were made during the day of the solar eclipse of February 3, 1935, and during several days before and after the eclipse day. The eclipse was found to produce a decrease of the critical frequency of each region. The decrease of critical frequency was approximately in time phase with the eclipse, thus indicating an ionizing agency (probably ultraviolet light), originating in the sun and propagated at approximately the velocity of light. The decrease of equivalent electron density in each region during the eclipse was compared with the decrease of the exposed area of sun's disk, and found to indicate that the ionization of the normal E region was diminished when the ionizing agency was decreased, by recombination of plus and minus charges, while the ionization of the F2region and a high stratum of the E was diminished by a process of attachment of electrons to neutral particles. View full abstract»

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  • A New Electron Tube Having Negative Resistance

    Page(s): 1041 - 1049
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    The dynatronic and magnedynatronic systems commonly used to obtain a negative resistance by means of triodes or tetrodes are characterized by the fact that the potential of the active electrode (the anode) is not the highest potential in the system; an electrode (the grid or the screen grid) at a higher potential is necessary in order to take off the secondary emission current from the anode in such a way that a falling characteristic is produced in the anode circuit. The present paper deals with a three-electrode tube of such design that the negative resistance is obtained in the circuit of the electrode possessing the highest potential in the system. View full abstract»

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  • Booklets, catalogs and pamphlets received

    Page(s): 1050
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  • Contributors to this issue

    Page(s): 1051 - 1052
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Aims & Scope

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

Full Aims & Scope