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Proceedings of the IRE

Issue 10 • Date Oct. 1947

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Displaying Results 1 - 25 of 37
  • Table of contents

    Publication Year: 1947, Page(s):1001 - 1002
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  • A Message to the IRE Membership from Its Board of Directors

    Publication Year: 1947, Page(s): 1003
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  • Murray G. Crosby, Board of Directors, 1947-1949

    Publication Year: 1947, Page(s): 1004
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  • New Low-Coefficient Synthetic Piezoelectric Crystals for Use in Filters and Oscillators

    Publication Year: 1947, Page(s):1005 - 1012
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2056 KB)

    Two crystals of the monoclinic sphenoidal class have been found which have modes of vibration with zero temperature coefficients of frequency, high electromechanical coupling constants, and high Q's or low dissipation. These properties make it appear probable that such crystals may have a considerable use in filters and oscillators as a substitute for quartz, which is difficult to obtain in large ... View full abstract»

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  • Variation of Bandwidth with Modulation Index in Frequency Modulation

    Publication Year: 1947, Page(s):1013 - 1020
    Cited by:  Papers (20)
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    Equations are derived for the carrier and side-frequency amplitudes which are obtained when a carrier wave is frequency-modulated by a complex audio signal. The bandwidth occupied by such a frequency-modulated wave is defined as the distance between the two frequencies beyond which none of the side frequencies is greater than 1 per cent of the carrier amplitude obtained when the modulation is remo... View full abstract»

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  • The Influence of Amplitude Limiting and Frequency Selectivity upon the Performance of Radio Receivers in Noise

    Publication Year: 1947, Page(s):1021 - 1025
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    This paper describes an experimental study of the relations which exist between the effectiveness of voice communication, measured in terms of the intelligibility of received speech, and the amplitudeand frequency-selective characteristics of amplitude-modulation receivers. The results lead to the following conclusions: (1) Amplitude limiters are ineffective against fluctuation noise. Against impu... View full abstract»

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  • Performance of Short Antennas

    Publication Year: 1947, Page(s):1026 - 1038
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7008 KB)

    The purpose of this paper is to present experimental data on the performance of vertical antennas having a physical height of less than one-eighth wavelength. These data cover many conditions of top loading performed on a 300-foot, self-supporting, tapered vertical tower with measurements of antenna resistance and reactance from 120 to 400 kilocycles. For these conditions, field-intensity measurem... View full abstract»

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  • Time Modulation

    Publication Year: 1947, Page(s):1039 - 1044
    Cited by:  Papers (3)
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    The techniques of time modulat on and demodulation have been extensively developed in the past five years for radar range-finding, pulse communication, and data transmission. This paper presents a brief review of the basic processes employed in time modulation and gives representative examples of practical circuits. In military applications considerable emphasis has been placed upon high precision... View full abstract»

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  • Time Demodulation

    Publication Year: 1947, Page(s):1045 - 1049
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    The demodulation of the signals imparted to carriers by the process of time modulation is an essential process of radar range finding, pulse data transmission, and communication. This paper describes methods for precision demodulation which depend upon a time modulator operating in synchronism with the input information, a time-discrimination element, and negative feed-back connections to control ... View full abstract»

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  • Analysis of Lengthening of Modulated Repetitive Pulses

    Publication Year: 1947, Page(s):1049 - 1053
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    Pulse lengtheners are circuits which lengthen a series of pulses without changing the relative pulse amplitudes. An ideal "box-car" pulse lengthener produces flat-topped pulses prolonged throughout the interval between pulses. It has been shown by Ming-Chen Wang and G. E. Uhlenbeck that if a pulse with repetition frequency f0, periodically modulated by a signal with fundamental frequenc... View full abstract»

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  • Abstract of "Recording of Sky-Wave Signals from Broadcast Stations"

    Publication Year: 1947, Page(s): 1053
    Cited by:  Papers (4)
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    First Page of the Article
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  • Investigation of Frequency-Modulation Signal Interference

    Publication Year: 1947, Page(s):1054 - 1059
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1168 KB)

    The cause and mechanism of interference between two frequency-modulation signals are analyzed. It is shown that, while the interference of two frequency-modulation signals on the same channel is practically independent of receiver design, off-channel interference depends on the shape of discriminator curve beyond 120 kilocycles off resonance. Methods are developed to calculate the amount of interf... View full abstract»

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  • High-Frequency Excitation of Iron Cores

    Publication Year: 1947, Page(s):1060 - 1067
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    Several iron alloys intended for use in wide-band transformers were studied from the point of view of core loss and exciting impedance. Techniques for studying these properties are described, using both high-frequency sine-wave and wide-band random-noise excitation. The frequency range of 0.1 to 5 megacycles was covered. Materials investigated include hipersil, monimax, molybdenum permalloy, and B... View full abstract»

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  • Wide-Range Double-Heterodyne Spectrum Analyzers

    Publication Year: 1947, Page(s):1068 - 1073
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3472 KB)

    Spectrum analyzers using double-heterodyne converter units can cover very wide frequency bands. A typical instrument described in this paper covers the range from 10 to 3000 megacycles. The signal frequency is changed to 24,600 megacycles by a crystal mixer and a special beating oscillator. A band-pass filter network rejects undesired frequencies and passes the output of the first mixer to a secon... View full abstract»

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  • The Behavior of "Magnetic" Electron Multipliers as a Function of Frequency

    Publication Year: 1947, Page(s):1074 - 1076
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    This paper consists of a theoretical and experimental study of the frequency variation of gain of magnetic electron multipliers. It is shown that, for multipliers of the type studied, the behavior as a function of over-all electron transit angle is very similar to that observed for electrostatic electron multipliers previously described. Up to frequencies of about 500 megacycles, loss in gain can ... View full abstract»

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  • Transit-Time Effect in Klystron Gaps

    Publication Year: 1947, Page(s):1076 - 1079
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The theory of the klystron is usually based upon a simplified configuration in which it is assumed that the grid spacing in the buncher is so small that, during the flight of the electron through it, the electric field changes very little. This assumption leads to a certain ideal value for the drift distance S. It is of interest to calculate the effect on the ideal value of S caused by a finite sp... View full abstract»

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  • Broad-Band Wave-Guide Admittance Matching by Use of Irises

    Publication Year: 1947, Page(s):1080 - 1085
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    A procedure is described for broad-band admittance matching of wave-guide devices by the use of simple irises. Slotted-line measurements yield the standing-wave ratio and position of voltage minimum for several wavelengths and allow the determination of the transverse plane along the axis of the wave guide at which the dispersion with wavelength of the reflection-coefficient phase is a minimum. Fo... View full abstract»

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  • Broad-Band Noncontacting Short Circuits for Coaxial Lines: Part II Parasitic Resonances in the Unslotted S-Type Plunger

    Publication Year: 1947, Page(s):1085 - 1091
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1552 KB)

    The problems involved in the design of wide-tuning-range resonators suitable for use with reflex-klystron oscillators have been discussed elsewhere. When these resonators are tuned with noncontacting short circuits, parasitic resonances, caused by waves propagating circumferentially around the small gaps between the plunger and the inner and outer conductors, may occur. In this paper it is shown t... View full abstract»

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  • Microwave Antenna Analysis

    Publication Year: 1947, Page(s):1092 - 1095
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The diffraction theory of Stratton and Chu is applied to a calculation of the vertical polar diagram and the gain of a parabolic cylindrical antenna. This antenna is fed by a line source having a known energy distribution and polarization. A numerical calculation for a particular profile is carried out, and the results are compared with those obtained experimentally. Satisfactory agreement between... View full abstract»

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  • Approximate Equivalent Circuit for a Resonator Transducer

    Publication Year: 1947, Page(s):1095 - 1096
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The equivalent circuit of a high-Q resonator transducer is given as a set of unit transducers connected in series on both ends. Each unit is a tank circuit with √L/C = 120 π, and two ideal transformers whose turns ratios are given for loops or probes in terms of electrode geometry and a quantity called relative volume. View full abstract»

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  • Discussion on "High-Impedance Cable" (Heinz E. Kallmann)

    Publication Year: 1947, Page(s):1097 - 1100
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  • Contributors to the Proceedings of the I.R.E.

    Publication Year: 1947, Page(s):1100 - 1104
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  • Correspondence

    Publication Year: 1947, Page(s):1105 - 1106
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  • Institute news and radio notes

    Publication Year: 1947, Page(s):1107 - 1116
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  • Books

    Publication Year: 1947, Page(s): 1116
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Aims & Scope

This Periodical ceased production in 1962. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope