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Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics

Issue 4 • Sept. 1956

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Displaying Results 1 - 24 of 24
  • Heat as a means of air purification

    Publication Year: 1956, Page(s):373 - 377
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1263 KB)

    These studies support the view that high-temperature heaters, such as the ceramic-type incandescent electric heater, exert a considerable bactericidal and sporicidal effect. When in operation in the home, the rates of reduction of air-borne micro-organisms generally are of the order of 50 per cent per hour for the more resistant spores. Where these electric heaters are the principal source of heat... View full abstract»

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  • The pulse stretch coupling circuit

    Publication Year: 1956, Page(s):377 - 379
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    This paper describes a new coupling circuit applicable to both half-wave and full-wave magnetic amplifiers, particularly those amplifiers simultaneously requiring fast time response and large power gains. The pulse stretch technique uses a pulsating bias signal derived from an external supply to block the power winding of the reactor during reset. This blocking action permits free core control yie... View full abstract»

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  • Temperature stabilization of transistor amplifiers

    Publication Year: 1956, Page(s):379 - 384
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1009 KB)

    A novel method of analysis of the thermal behavior of transistor amplifiers is developed by introducing the temperature incremental equations of the transistor and of its associated d-c network. Design formulas for prescribed thermal stability, and in particular for the case of thermistor compensation, are derived. Experimental verifications of the theory are included. View full abstract»

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  • Magnetic frequency multipliers and their rating part I -- Frequency triplers

    Publication Year: 1956, Page(s):384 - 390
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1181 KB)

    THERE ARE a growing number of applications in which a source of power at a higher frequency than the standard 60 or 400 cps (cycles per second) is either necessary or desirable. Rotating machines, electronic generators, and magnetic frequency multipliers are some of the devices which may be employed to obtain such a power supply. Magnetic frequency multipliers have certain inherent advantages whic... View full abstract»

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  • Optimum design of common-emitter transistor audio amplifiers

    Publication Year: 1956, Page(s):391 - 395
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB)

    An analytical procedure of design of common-emitter transistor audio amplifiers is given. The conditions of optimum design for maximum power output are derived for resistance-capacitance and transformer-coupled amplifiers, taking in consideration the limitations of the collector characteristics. Finally, the distortion caused by nonlinearity of the collector characteristic is computed. View full abstract»

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  • A single-transistor magnetic-coupled oscillator

    Publication Year: 1956, Page(s):396 - 400
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2563 KB)

    AN IMPORTANT oscillator circuit which converts d-c to a-c square waves having an output frequency proportional to the d-c input voltage was developed by Royer.1 The circuit, shown in Fig. 1, employs a magnetic core constructed of square hysteresis loop material and two junction transistors operated as controlled switches.2 As the circuit oscillates, the core flux swings repetitively between its po... View full abstract»

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  • The symmetrical transistor as a bilateral switching element

    Publication Year: 1956, Page(s):400 - 403
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (795 KB)

    TRANSISTORS and diodes have been employed successfully as basic building blocks in the design of switching systems. Much progress is being made in the development of transistorized equipment which promises ultimately to supplant the more conventional electromechanical equipment that at present is in common use. View full abstract»

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  • An analysis and design of the ferroelectric resonant trigger pair

    Publication Year: 1956, Page(s):404 - 407
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    THE CIRCUITS to be analyzed in this paper are the 2-branch series-resonant circuit shown in Fig. 1; and the 2-mesh, parallel resonant circuit shown in Fig. 2. There are several approaches for analyzing such circuits based upon developments by Duffing, Poincaré, Kryloff and Bogoliuboff and others.1¿9 The choice of one approach over another depends on the accuracy desired, the accuracy obtainable,... View full abstract»

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  • The ferroresonant trigger pair: Analysis and design

    Publication Year: 1956, Page(s):407 - 416
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3196 KB)

    The phenomenon of nonlinear resonance can be utilized in the design of a trigger pair which uses neither vacuum tubes nor transistors, is capable of highspeed operation, and operates with electrical input and output signals. This article outlines the analysis of the basic circuit to a first approximation only, and design relations are derived. Experimental data are also given. Applications of the ... View full abstract»

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  • Transmission of business machine data over standard telegraph channels

    Publication Year: 1956, Page(s):416 - 420
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1097 KB)

    THE transmission of digital information over long distances for the operation of business machines is a problem that will engage increasing attention of communication engineers. High-speed electronic computer-type business machines are being called upon more and more to operate on information fed from distant points. This new form of transmission results in encoded information which is not at all ... View full abstract»

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  • Control system for integrated data processing

    Publication Year: 1956, Page(s):421 - 427
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2841 KB)

    TO MEET the increasing demands from its patrons for automation equipment, the Western Union Telegraph Company has completed the design of an extremely versatile data control system for use with high-speed electronic computers at centralized integrated data-processing (IDP) centers. This system serves as the main artery for data information which can be transmitted simultaneously from cities throug... View full abstract»

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  • A video visual measuring set with sync pulses

    Publication Year: 1956, Page(s):427 - 432
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3383 KB)

    This test set is designed to make gain-frequency measurements of a video transmission circuit over the range of 100 kc to 10 mc (megacycles) and present the characteristic on an oscilloscope. The test signal is arranged to include a simulated horizontal synchronizing pulse for use on video circuits equipped with pulse operated devices such as clampers. It is intended for operation where the transm... View full abstract»

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  • Alternating current control of the half-wave bridge magnetic amplifier

    Publication Year: 1956, Page(s):433 - 438
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3546 KB)

    RECENT developments in transistors indicate great promise for a high-gain, high-power-output servo amplifier consisting of a transistor preamplifier in combination with a fast-response half-wave bridge magnetic power amplifier. Existing literature on this type of magnetic amplifier does not discuss certain problems inherent in applying this device as an output stage fed by an a-c pre-amplifier.1,2... View full abstract»

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  • Microwave facilities with built-in reliability

    Publication Year: 1956, Page(s):438 - 441
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1633 KB)

    THIS PAPER describes a short-haul microwave radio system now providing toll quality telephone message service between San Diego (elevation 320 feet), Calif., and the Laguna Mountain recreation area (elevation 6100 feet), Calif. The microwave portion of the system employs Motorola frequency diversity equipment operating in the 5,925 to 6,425 mc (megacycle) common carrier allocation. The microwave s... View full abstract»

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  • Automatic dispatch system for half-duplex teletypewriter lines

    Publication Year: 1956, Page(s):441 - 445
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1412 KB)

    HALF-DUPLEX multistation teletypewriter lines efficiently meet the needs of several points that require record communication with each other. In such cases it is important to be able to send messages to selected stations only. This ability is necessary to save paper, to provide privacy, and to avoid the need to scan all messages at each station to find those addressed to it. Direct interstation co... View full abstract»

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  • The analysis of sampled data servomechanisms performed on the IBM Type 650

    Publication Year: 1956, Page(s):446 - 450
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1043 KB)

    Because of the need for more accurate and versatile control capabilities than can be obtained economically with continuous systems, discrete filters (digital computers) are being substituted as control elements in many applications. The exact response of linear systems which combine continuous and discrete filters can be obtained for discrete values of time by a series of well-defined mathematical... View full abstract»

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  • Subharmonic response of the ferroresonant circuit with coil hysteresis

    Publication Year: 1956, Page(s):450 - 456
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2329 KB)

    A SERIES circuit consisting of a capacitance, resistance, and a saturable reactor may, because of the nonlinearity, have a markedly different response from that of the corresponding linear circuit when a periodic voltage is impressed.1¿4 This difference manifests itself in two ways: 1. Jump phenomena occur. 2. The response may contain harmonics which are not present in the impressed voltage. The ... View full abstract»

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  • Recent new features for the no. 5 crossbar switching system

    Publication Year: 1956, Page(s):457 - 466
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10708 KB)

    THE NUMBER 5 crossbar switching system was described by Korn and by Ferguson1 in 1950, just a year and a half after the first installation was placed in service at Media, Pa. These authors mentioned the growing need ¿ ¿ for a dial system which would better meet the telephone switching requirements for areas on the outskirts of metropolitan cities and at the same time care for medium-to-large siz... View full abstract»

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  • Capability of sealed contact relays

    Publication Year: 1956, Page(s):466 - 468
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (945 KB)

    A CIRCUIT designer contemplating the use of a relay must consider its operating characteristics and the reliability of its contacting function. The electric erosion causing contact wear gives rise to contact surface conditions permitting contact failure to open a circuit caused by locking; particularly in talking circuits, reliability can be further impaired by the operating environment which may ... View full abstract»

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  • Investigations concerning polarization in barium titanate ceramics

    Publication Year: 1956, Page(s):469 - 477
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2236 KB)

    Considerable information may be obtained concerning polarization in barium titanate ceramics by a careful analysis of hysteresis loops. Mathematically it is shown that both symmetrical and unsymmetrical loops, the latter being characteristic of polarized specimens, can be represented best by a Fourier series. It was found that direct voltage and even harmonic components are present in the unsymmet... View full abstract»

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  • Graphical determination of the Fourier series coefficients

    Publication Year: 1956, Page(s):478 - 482
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1011 KB)

    ALMOST all of the many good textbooks on analysis of electric circuits include analysis of nonsinusoidal waves. Equations are usually given which determine the amplitude of each term of the Fourier trigonometric series. If the dependent variable can be expressed in terms of the independent variable, the familiar relations View full abstract»

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  • Design features of Bell System wire spring relays

    Publication Year: 1956, Page(s):482 - 486
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3860 KB)

    THE Bell Telephone System wire spring relays have become the basic circuit components of telephone switching systems developed during the past few years. These relays are provided in many varieties to meet circuit needs. They are similar in operation and construction and have been described to a large extent in earlier publications.1,2 It is the purpose of this paper to highlight some of the desig... View full abstract»

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  • The full stature of the crossbar tandem switching system

    Publication Year: 1956, Page(s):486 - 496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3275 KB)

    CROSSBAR tandem is a relatively young switching system. It first went into service in 1941. Its original role was well defined although, in retrospect, severely limited; it was to take over in large metropolitan areas the functions of the panel-type office selector tandem system, even as the no. 1 crossbar system1 took over from the local panel central office. However, even at that early date, its... View full abstract»

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  • The development of automatic manufacturing facilities for reed switches

    Publication Year: 1956, Page(s):496 - 500
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4473 KB)

    Many unique engineering problems had to be solved before successful automatic manufacturing facilities could be developed to produce high quality reed switches at low cost for the Telephone System. This paper outlines the engineering program that lead to the successful completion of this project. View full abstract»

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Aims & Scope

This Transactions ceased publication in 1963. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope