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Proceedings of the IRE

Issue 9 • Date Sept. 1948

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Displaying Results 1 - 25 of 27
  • Table of contents

    Publication Year: 1948 , Page(s): 1065
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  • John B. Coleman, Regional Director, 1948-1949

    Publication Year: 1948 , Page(s): 1066
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  • Engineering Thinking and Human Progress

    Publication Year: 1948 , Page(s): 1067
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  • Atomic Structure

    Publication Year: 1948 , Page(s): 1068 - 1080
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    Data obtained from the Rutherford scattering experiment are used to present a simple picture of the structure of the atom. This picture is shown to be in agreement with the experimental findings on the electrical nature of matter. On the assumption that the particles which make up the nucleus (neucleons) are neutrons and protons, a "building-up" of the various atoms is explained and a system of nuclear nomenclature is developed. The model of an atom as a central nucleus of neutrons and protons surrounded by outer shells of electrons is found to fit in with the results of many physical and chemical experiments. In particular, the results of experimental spectroscopy yield quantitative agreement with certain calculations made on this atomic model. Bohr's theory of the hydrogen atom is developed in simple terms and the equation for energy level in the H-atom is derived. Excitation and ionization of atoms are described in terms of the Bohr model of the atom. View full abstract»

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  • Theory of Frequency-Modulation Noise

    Publication Year: 1948 , Page(s): 1081 - 1092
    Cited by:  Papers (36)
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    The energy spectrum of frequency-modulation noise is computed for different ratios of signal to noise. Numerical values are given for some simple filter amplitude characteristics. The theory is based on the Fourier concept of noise and treated in three steps: no signal, signal without modulation, and modulated signal. The result is given in the form of a series, and it is shown that this development is convergent. The suppression of the modulation by noise is also discussed. View full abstract»

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  • A Note on a New Ionospheric-Meteorological Correlation

    Publication Year: 1948 , Page(s): 1093 - 1095
    Cited by:  Papers (1)
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    Past investigations in the field of ionospheric-meteorological correlation are reviewed, with special emphasis on ionospheric characteristics correlating with barometric pressure. An attempt to verify past correlations involving pressure has been made with negative results. However, a new correlation is presented between the time-of-occurrence of the maximum F2critical frequency during a single day and the average daily barometric pressure. View full abstract»

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  • A Phase-Shift Oscillator with Wide-Range Tuning

    Publication Year: 1948 , Page(s): 1096 - 1100
    Cited by:  Papers (4)
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    A new audio oscillator of the phase-shift type is discussed. The oscillator can cover continuously the entire audio-frequency range, and tuning is achieved by varying but one element of the feedback network. The theory of the new principle and a description of the oscillator are given. View full abstract»

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  • An Experimental Investigation of the Radiation Patterns of Electromagnetic Horn Antennas

    Publication Year: 1948 , Page(s): 1101 - 1105
    Cited by:  Papers (3)
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    A systematized set of radiation patterns of rectangular electromagnetic horn antennas have been measured and are shown as a function of electric and magnetic plane flare angles and radial length of the horn. A total of two hundred and fifty patterns are included for representative flare angles from zero to 50°, and radial lengths from zero to fifty wavelengths. This set of patterns reveals many characteristic properties which may serve as a guide in the design of electromagnetic horn antennas. View full abstract»

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  • Fields in Nonmetallic Waveguides

    Publication Year: 1948 , Page(s): 1105 - 1109
    Cited by:  Papers (6)
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    An infinite plate of dielectric material is taken as the prototype of nonmetallic waveguides. The Green's function is found for the case in which the electric field is parallel to the surfaces of the plate. The solution is set up as a Fourier integral, which is then replaced by a complex contour integral. There are but a finite number of real poles, the residues at which correspond to the propagating modes in the metallic guide. An integral around a branch cut gives a wave radiating into space, which is the analog of the attenuated modes of the metallic guide. The modal field distributions are discussed for the plate and for circular rods. The surface fields are not small, but they are attenuated transversely at rates of 28 db per radius and higher; a system using a dielectric guide would be at least fairly well shielded. The nonmetallic guide should be useful wherever a low-cost flexible conductor is needed and imperfect shielding can be tolerated. View full abstract»

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  • The Relationship between the Emission Constant and the Apparent Work Function for Various Oxide-Coated Cathodes

    Publication Year: 1948 , Page(s): 1109 - 1114
    Cited by:  Papers (1)
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    Measurements were made of the emission of oxide-coated cathodes on six chemically different metal wires over a period of 500 hours. An empirical emission equation was employed which was found to be as accurate as the conventional Dushman equation and to be simpler to use. It was found that the logarithm of the emission constant A′ varied as the sum of the apparent work function times a constant, and the constant B. View full abstract»

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  • Effects of Hydrostatic Pressure on Electron Flow in Diodes

    Publication Year: 1948 , Page(s): 1115 - 1121
    Cited by:  Papers (1)
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    Inclusion of the hydrostatic pressure term, with constant temperature, in the electron force equation of a diode is shown to give a way by which the effect of Boltzman's relation for a retarding field disappears as the field becomes accelerating. Thus, one equation holds from the cathode surface through the potential minimum to the anode. As a result, one may deduce the usual temperature-limited emission formula for maximum current, the space-charge-limited characteristic, and the transition region from one to the other. Some remarks on this, from the standpoint of transport theory, are included. View full abstract»

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  • Precision Measurement of Electrical Characteristics of Quartz-Crystal Units

    Publication Year: 1948 , Page(s): 1122 - 1131
    Cited by:  Papers (5)
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    Extensive manufacture and use of quartz-crystal units for radio communication, instrumentation, control, and detection purposes was responsible for new investigations to improve all phases of piezoelectric units and devices. A small part of the total work included development of circuit arrangements and instruments for accurately measuring the electrical constants of crystal units. This paper describes precision methods of high-frequency radio measurements as used successfully on quartz-crystal units and applicable to other types of units having Q's and impedance ranges up to several million or higher. View full abstract»

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  • Contributors to the Proceedings of the I.R.E.

    Publication Year: 1948 , Page(s): 1132 - 1133
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  • Correspondence

    Publication Year: 1948 , Page(s): 1134 - 1135
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  • Institute news and radio notes

    Publication Year: 1948 , Page(s): 1136 - 1141
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  • Books

    Publication Year: 1948 , Page(s): 1141
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  • IRE People

    Publication Year: 1948 , Page(s): 1142
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  • John C. Petkovsek, Chairman, Beaumont-Port Arthur Section, 1947-1948 and George P. Adair, Chairman, Washington Section, 1948-1949

    Publication Year: 1948 , Page(s): 1143
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  • College Research to the Aid of "Small Business"

    Publication Year: 1948 , Page(s): 1144 - 1145
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  • Correction

    Publication Year: 1948 , Page(s): 1145
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  • Technical Aspects of Experimental Public Telephone Service on Railroad Trains

    Publication Year: 1948 , Page(s): 1146 - 1152
    Cited by:  Papers (1)
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    Telephone service was made available experimentally in 1947 to passengers aboard certain railroad trains operating between New York, N.Y., and Washington, D.C. Communication between these trains and the telephone network is effected through radio stations of the urban mobile telephone services of the Bell System. This paper describes component parts of the train telephone system, results of radio coverage tests on the routes involved, and devices employed to control two-way transmission. Special features of the installations which differ from previous mobile installations and some results of the experimental operation are pointed out. View full abstract»

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  • Television Antenna and RF Distribution Systems for Apartment Houses

    Publication Year: 1948 , Page(s): 1153 - 1160
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    The requirements of television antenna and rf distribution systems for apartment houses are discussed. Amplifiers and distribution networks are described which supply boosted signals of all available stations on their original carriers to all receivers in an apartment house. View full abstract»

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  • A Broad-Band High-Level Modulator

    Publication Year: 1948 , Page(s): 1160 - 1164
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    A class-B modulator has been devised to assure a broad pass band having uniform gain with quite low distortion and noise level. Unique features include (1) a cathode follower, (2) no modulation transformer, and (3) broad-band feedback. View full abstract»

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  • Simplified Automatic Stabilization of a Frequency-Modulated Oscillator

    Publication Year: 1948 , Page(s): 1164 - 1171
    Cited by:  Papers (1)
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    A frequency-modulated exciter which incorporates a quartz-crystal discriminator for center-frequency stabilization of the modulated oscillator is described. The unit was designed as the exciter for a frequency-modulated broadcast transmitter. The frequency-stabilizing circuits are the unique portion and are described in detail. Circuit simplicity is attained by operating the discriminator at the modulated-oscillator frequency, thus eliminating heterodyning and mixing circuits. A special bridge circuit, operating on the modulator bias, maintains the average frequency at the midpoint of the discriminator. Performance and stability of a completed unit are briefly discussed. View full abstract»

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  • The Cathode-Coupled Clipper Circuit

    Publication Year: 1948 , Page(s): 1172 - 1177
    Cited by:  Papers (1)
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    The cathode-coupled amplifier circuit is used as a clipper with some advantages over the conventional pentode and diode types. An analytical solution is obtained for proper operating conditions to give the desired size of output pulse, allowable range of input voltages, bias values for symmetrical clipping, and the like. Regenerative feedback is shown to give considerable improvement in the clipping action, and design methods for obtaining optimum clipper performance are outlined. View full abstract»

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Aims & Scope

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

Full Aims & Scope