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Proceedings of the Institute of Radio Engineers

Issue 4 • Date April 1938

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  • [Front cover]

    Publication Year: 1938, Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Publication Year: 1938, Page(s): c2
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  • Contents

    Publication Year: 1938, Page(s): i
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  • General Information

    Publication Year: 1938, Page(s): ii
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  • Institute sections

    Publication Year: 1938, Page(s): iii
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  • Geographical Location of Members Elected March 2, 1938

    Publication Year: 1938, Page(s):iv - v
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  • Applications for Membership

    Publication Year: 1938, Page(s):vi - vii
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  • Officers and Board of Directors

    Publication Year: 1938, Page(s): viii
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  • Committees of the Institute of Radio Engineers 1938

    Publication Year: 1938, Page(s):ix - xi
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  • Institute news and radio notes

    Publication Year: 1938, Page(s):387 - 399
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  • Correction

    Publication Year: 1938, Page(s): 400
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  • The Developmental Problems and Operating Characteristics of Two New Ultra-High-Frequency Triodes

    Publication Year: 1938, Page(s):401 - 414
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2824 KB)

    Large values of power are difficult to obtain in the ultra-high-frequency region. At the limiting frequencies it is increasingly more difficult to find vacuum tubes that will deliver such power and perform efficiently. The principal factors that affect the design and performance of the tubes are those involving the electrical circuit, the size requirements for the power desired, and the transit ti... View full abstract»

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  • Constants of Fixed Antennas on Aircraft

    Publication Year: 1938, Page(s):415 - 420
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1696 KB)

    This paper presents the resistance and reactance characteristics of various fixed antennas on two types of modern aircraft, one a two-place low-wing metal military airplane of the attack type and the other a large mid-wing metal military airplane of the bombardment type, whose dimensions are comparable to those of modern commercial transport airplanes. A frequency range of from three to eight mega... View full abstract»

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  • Direct Measurement of the Loss Conductance of Condensers at High Frequencies

    Publication Year: 1938, Page(s):421 - 432
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    A method of measuring the losses of a variable air condenser at high frequencies is described in which the condenser under test and the standard are connected in series as part of a tuned circuit. A radio-frequency voltage of resonant frequency is impressed on this circuit for a stated value of the standard. The unknown is then removed and the standard adjusted to resonance. The voltage across the... View full abstract»

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  • The Variation in the High-Frequency Resistance and Permeability of Ferromagnetic Materials due to a Superimposed Magnetic Field

    Publication Year: 1938, Page(s):433 - 441
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The variation of the high-frequency resistance of ferromagnetic conductors as a function of a superimposed magnetic field is discussed. It is shown that very large changes in high-frequency resistance are obtainable in ferromagnetic conductors having high initial permeabilities. Some important applications of this effect are given. The application of high-frequency incremental permeability to remo... View full abstract»

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  • A Method of Neutralizing Hum and Feed-Back Caused by Variations in the Plate Supply

    Publication Year: 1938, Page(s):442 - 448
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A method is described whereby hum and feedback can be reduced in multistage screen-grid resistance-coupled amplifiers. By the method described it is possible to reduce degenerative and regenerative feedback and hum. The principle involves using the screen grid of a multigrid tube in such a manner that it produces a variation upon the grid of the followling tube substantially equal to and out of ph... View full abstract»

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  • Harmonic Generation

    Publication Year: 1938, Page(s):449 - 468
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1432 KB)

    When plate current in a vacuum-tube amplifier flows for only a portion of the grid-excitation cycle, harmonics appear in the output circuit. The magnitude of any one of these harmonics depends upon the fraction of the fundamental cycle during which plate current flows. In the gradual transition from perfect class A to extreme class C operation, the magnitude of the nth harmonic goes through a seri... View full abstract»

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  • On Single and Coupled Tuned Circuits Having Constant Response-Band Characteristics

    Publication Year: 1938, Page(s):469 - 474
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    The gain characteristic of a two-stage amplifier, one stage of which works into coupled tuned circuits while the other works into a single tuned circuit, is discussed. It is shown that this combination is capable of giving a flat response over a satisfactory band of frequencies and that the required circuit constants are easily computed. View full abstract»

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  • Armstrong's Frequency Modulator

    Publication Year: 1938, Page(s):475 - 481
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    When the side bands of an amplitude-modulated signal are shifted 90 degrees and then recombined with the carrier, a frequency-modulated carrier results. In this paper the order and magnitudes of the distortion components of such a frequency-modulated carrier are quantitatively determined assuming an idealized receiver. It is found that this type of distortion will be negligibly small after frequen... View full abstract»

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  • Characteristics of the Ionosphere at Washington, D.C., February, 1938

    Publication Year: 1938, Page(s):482 - 485
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    Data on the ordinary-wave critical frequencies and virtual heights of the ionospheric layers are presented for the period indicated in the title. The monthly average values of the maximum usable frequencies for undisturbed days, for radio transmission by way of the regular layers is also provided. View full abstract»

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  • Contributors to this issue

    Publication Year: 1938, Page(s):486 - 487
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  • Booklets, catalogs and pamphlets received

    Publication Year: 1938, Page(s):488 - 490
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Aims & Scope

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

Full Aims & Scope