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

Issue 5 • Date Nov. 1957

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Displaying Results 1 - 25 of 30
  • Two-phase motor drive using static frequency-doubler amplifiers

    Publication Year: 1957, Page(s):497 - 503
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    A variable-speed drive is described in which a 2-phase induction motor is energized by power modulators of the frequency-doubler type. The system provides continuous and reversible control of motor torque. In comparison with similar drives using conventional magnetic amplifiers this system has the advantages of simplicity, high efficiency, inherent zero stability, and reasonably flat torque-speed ... View full abstract»

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  • Magnetic output amplifiers for digital control

    Publication Year: 1957, Page(s):504 - 508
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    WITH the advent of power-frequency magnetic-amplifier devices for logic systems, a need has developed for power-output magnetic amplifiers to raise the very low output level of logic elements to the moderate power requirements of transducer devices. Logic devices generally replace small control relays in industrial applications, but, instead of being able to control loads of approximately 100 to 1... View full abstract»

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  • Solution of simultaneous equations by block elimination

    Publication Year: 1957, Page(s):509 - 514
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB)

    THIS paper presents an exact method for solving simultaneous linear algebraic equations which the author believes has many advantages over other procedures. It extends the familiar method of eliminating a single unknown at a time to that of eliminating large groups in a single process. A close relationship to the reduction or ¿¿partitioning¿¿ of matrices1,2 is also seen to exist. The process is ap... View full abstract»

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  • Operational magnetic amplifiers with multiple control windings

    Publication Year: 1957, Page(s):515 - 520
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    ALTHOUGH a great deal of effort has been expended in the development of analyses of magnetic amplifiers, a completely satisfactory mathematical representation of this dynamic operation, characterized by the soundness of its mathematical basis and by the convenience of its application in analysis and synthesis, has yet to appear. Because of the discrete nature of the operation, the input and output... View full abstract»

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  • Dynamic gauging and automatic adjusting of wire spring relays

    Publication Year: 1957, Page(s):520 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB)

    RELAYS are the most commonly used electrically operated device in telephone switching systems. A few years ago a radically different design of relay, identified as the ¿wire spring type,¿ was introduced for use as a basic component of Bell System equipment. Several articles1,2 have been published that describe the design objectives, features, and operating characteristics associated with this re... View full abstract»

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  • High-frequency magnetic servo amplifier for air-borne control systems

    Publication Year: 1957, Page(s):526 - 529
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB)

    THE ADVANTAGES of operating magnetic amplifiers at frequencies higher than the usual 60 and 400 cycles per second (cps) are improved transient response and reduced size and weight. These advantages are very important in the application of magnetic amplifiers to air-borne control systems. This paper presents results of the development of a high-frequency 4,700-cps magnetic servo amplifier used to d... View full abstract»

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  • A new application of the Hurwitz-Routh stability criteria

    Publication Year: 1957, Page(s):530 - 533
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (361 KB)

    WHEN THE HURWITZ-ROUTH stability criteria are applied to an algebraic polynomial with real coefficients, the existence, or nonexistence, of unstable roots of the polynomial is revealed. However, if the polynomial contains all stable roots, the criteria do not give an indication of the relative stability of the roots. The latter information is frequently desired. View full abstract»

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  • Magnetically regulated reference power supply

    Publication Year: 1957, Page(s):534 - 537
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    THE NEED for a highly accurate and reliable d-c voltage reference as part of a Navy Gun Fire-Control System resulted in development of the reference supply described. The customer's requirements imposed severe size and reliability restrictions. The reliability requirements resulted in the choice of magnetic amplifiers for instrument servos of the system. Upon evidence of the feasibility of their u... View full abstract»

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  • Design of an improved 2-stator watt-hour meter

    Publication Year: 1957, Page(s):537 - 540
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    An improved design of 2-stator polyphase watt-hour meter is described in which low rotor speed is utilized to give improved performance over extended load and voltage ranges. Fundamental performance equations are derived to show how this improved performance is attained. View full abstract»

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  • Quality assurance ¿¿ An essential part of the Western electric manufacturing process

    Publication Year: 1957, Page(s):540 - 542
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    THE Bell Telephone Laboratories and the Western Electric Company (WE) pioneered the development and use of statistical methods for controlling product quality during the manufacturing process. It was not until the war years that this tool, statistical quality control, received widespread attention throughout industry. During the many years that WE has used statistical quality-control procedures in... View full abstract»

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  • The work of the International Telecommunication Union in the field of telephony

    Publication Year: 1957, Page(s):543 - 552
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (817 KB)

    FEW ENGINEERS in North America are familiar with the work of the International Telecommunication Union or are even aware of its existence. This paper discusses the Union; its organization, how it functions, and what it is doing in the field of telephony. It also gives an assessment of the value of this work and an appraisal of its significance to the communication developments in the United States... View full abstract»

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  • Equations for the inductances and current distribution of multiple-conductor single-phase and polyphase busses

    Publication Year: 1957, Page(s):553 - 558
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    THE purpose of this paper is twofold: to derive general equations for calculating the currents and inductances associated with each subconductor of a multiple-conductor single-phase or polyphase bus; and to illustrate application of these equations by numerical analysis of several typical busses. View full abstract»

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  • The Canadian broadcasting corporation's radio service in Canada

    Publication Year: 1957, Page(s):558 - 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    THE Canadian Broadcasting Corporation (CBC) is a public corporation established by act of parliament to carry on a national broadcasting service in Canada. The purpose of the CBC is to provide radio and television service for the whole of the nation; to develop Canadian programs and to bring in selected programs from other countries, to make this service available to as many Canadians as can possi... View full abstract»

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  • The D-C controlled A-C voltage source, a new magnetic amplifier

    Publication Year: 1957, Page(s):562 - 566
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (455 KB)

    MAGNETIC AMPLIFIERS have become increasingly popular in the last few years, and extensive work has been done to relate their performance to various operating conditions. There has, however, been a distinct tendency to confine the work to fairly well-known basic circuits. These have been so exhaustively studied that there appears to be little hope of greatly improving their operating characteristic... View full abstract»

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  • A self-balancing transformer-core-loss bridge

    Publication Year: 1957, Page(s):567 - 573
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Measuring transformer core loss by impedance bridge methods offers a number of advantages over conventional wattmeter methods, particularly in automation. Human errors are minimized and test accuracy is improved. The bridge is self-balancing and control can be effected either by manual or punched card programming. Direct readings, high precision, and high output torque make the self-balancing brid... View full abstract»

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  • Development of a thermal-neutron flux-measuring instrument

    Publication Year: 1957, Page(s):573 - 577
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    The instrument measures thermal-neutron flux directly and automatically. Measurements are nearly independent of gamma flux and ambient temperature. The method depends upon balancing the temperatures of an electrically heated balancing element and a fission-heated uranium-fueled sensing element. The flux-detector assembly measures only 3/16-inch OD (outside diameter) by 2¿ inches long. View full abstract»

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  • Magnetic amplifier analysis and application using block-diagram techniques

    Publication Year: 1957, Page(s):578 - 588
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    THE SYNTHESIS of feedback-control systems incorporating magnetic amplifiers has long been hampered by the lack of a really satisfactory way in which to represent the transfer function of the self-saturating magnetic amplifier. Approximations, such as those which represent the magnetic amplifier as being characterized by a volts-per-ampere-turn gain and an L-R time constant, are normally unsatisfac... View full abstract»

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  • Cycle- and delay-time considerations in a real-time digital computer

    Publication Year: 1957, Page(s):588 - 593
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    The use of digital computers in physical control systems requires consideration of certain special effects not normally encountered with analog computers, namely, the sampling action and the computation delay. In this paper, the two effects are defined and their relationship to the digital computer program established. It is shown how they may be selected so as to result in program optimization. A... View full abstract»

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  • Temperature rise of solid junctions under pulse load

    Publication Year: 1957, Page(s):593 - 598
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (633 KB)

    Junctions subjected to pulse currents have a temperature rise that depends on dimensions, materials, and cooling, as much as magnitude, duration, and form of the pulse. Short pulses heat only a part of the body containing the junction; longer pulses permit the heat to penetrate deeper. Short pulses of constant magnitude, or linearly increasing in time, or capacitor discharges, show only a small di... View full abstract»

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  • Signal-to-noise ratios in strong-carrier FM systems

    Publication Year: 1957, Page(s):599 - 602
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (421 KB)

    Signal-to-noise ratios are derived for an FM (frequency modulated) system in which the r-f (radio-frequency) carrier is strong compared with the noise. The results are derived in a simple way without making use of high-order probability density functions. General formulas are derived for determining the signal-to-noise ratio with periodic modulation or with pulse modulation, and numerical results ... View full abstract»

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  • A magnetic amplifier voltage-current overload protection circuit

    Publication Year: 1957, Page(s):602 - 606
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (583 KB)

    LOW-VOLTAGE, high-current, regulated power supplies, such as are used in transistor computers, present an overload protection problem. In many instances fuses are prohibited because of their susceptibility to damage through vibration or they are unsatisfactory because of other reliability requirements. Circuit breakers may not be placed in the outputs of the regulated supplies because of the regul... View full abstract»

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  • Design factors for the optimization of multichannel radio systems

    Publication Year: 1957, Page(s):606 - 620
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1363 KB)

    The satisfactory design of a multichannel radio system requires evaluation of both nonlinear and thermal noise power and the statistical considerations associated with each. It is pointed out that an optimum design can be attained when these noise powers are equal; and since the noise power is greatest in the top channel of the FM (frequency modulation) system, it is sufficient and suitable to est... View full abstract»

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  • Silicon rectifiers in brushless machinery

    Publication Year: 1957, Page(s):620 - 626
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (747 KB)

    An illustration of the use of rotating silicon rectifiers in brushless machinery is given in application to generators for the B-58 bomber. The evolution of both oil-cooled and air-cooled rotating rectifier assemblies is presented. The use of silicon rectifiers in this application illustrates their operation under the most extreme environmental conditions. In addition to all the usual salt spray, ... View full abstract»

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  • A modified microwave system for color television transmission

    Publication Year: 1957, Page(s):626 - 633
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (743 KB)

    THE author's company has a continuing operational requirement for approximately 30 portable microwave radio relay systems in the Southern California area These relay systems are used to extend the Bell System broad-band network to temporary service locations in the area. to bridge existing facilities in the event of transmission failure, or to provide semipermanent studio to transmitter links. View full abstract»

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  • The response of resistance voltage dividers to steep-front impulse waves

    Publication Year: 1957, Page(s):634 - 646
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1254 KB)

    At present there is no generally accepted technique for determining the response of high-voltage dividers to fractional microsecond impulse waves. This paper describes a method which uses a low-voltage cable-type pulse generator and a high-speed oscilloscope as the basic tools. A technique for calibrating the oscilloscope amplifier and the associated input attenuators is described. The effects of ... 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