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

Issue 5 • Date Nov. 1953

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Displaying Results 1 - 25 of 34
  • L3 coaxial system ¿¿ Amplifiers

    Publication Year: 1953, Page(s):505 - 517
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11111 KB)

    The line amplifiers for the L3 coaxial system are designed to compensate for the loss of the 4 miles of cable which separate the repeaters; the flat amplifiers are used to compensate for equalizer loss and as transmitting amplifiers. The two types are basically similar, consisting of two feedback amplifiers in tandem, separated by an interamplifier network; in the line amplifier, this network is v... View full abstract»

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  • Co-ordination of M1 and N1 telephone carrier systems

    Publication Year: 1953, Page(s):517 - 520
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3373 KB)

    The Bell System's new N1 carrier system is a low-energy cable carrier system and is subject to interference from existing carriers with overlapping frequencies and higher energy levels. This paper is concerned with the development of a suppression device to prevent energy from the M1 open-wire carrier system disturbing the channels of the N1 system. The problem is complicated by the requirement th... View full abstract»

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  • The electric strength of air in nonuniform fields at radio frequencies

    Publication Year: 1953, Page(s):520 - 524
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3873 KB)

    The purpose of this study is to investigate the electric strength of air in the frequency range of 2.0 to 16.0 megacycles per second, using a central wire and cylinder as electrodes. Work has previously been done with a similar electrode arrangement up to 1.5 megacycles per second.1 A reduction in breakdown voltage up to 6.0 per cent was noted in this instance. The present investigation shows that... View full abstract»

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  • Preliminary development of a magnettor current standard

    Publication Year: 1953, Page(s):524 - 531
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5593 KB)

    In the wartime development of the air-borne magnetometer, a method of detecting extremely small changes in magnitudes of magnetic fields was developed. The principle involved was the use of a second-harmonic type of magnetic modulator now known as a magnettor. This instrument can detect changes in magnetic fields in the order of 10¿5 oersted. A study was made at Rutgers University under the spons... View full abstract»

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  • Stressed ferrites having rectangular hysteresis loops

    Publication Year: 1953, Page(s):531 - 537
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5431 KB)

    A study has been made of the effect of stress on the magnetic properties of ferrites. Rectangular hysteresis loops were obtained by encasing toroidal specimens in plasties which shrink during polymerization. Ferrites having this type of hysteresis loop are useful in magnetic switching and magnetic memory devices. View full abstract»

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  • A level compensator for telephotograph systems

    Publication Year: 1953, Page(s):537 - 541
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3664 KB)

    SINCE 1936, a number of different telephotograph systems1 have been operated over the lines of the Bell System on a leased-wire basis. The requirements which a line facility must meet for such service are in several respects more severe than the requirements for voice-message service. Telephotograph ¿ transmission requirements have usually specified that abrupt variations in line net loss should ... View full abstract»

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  • L3 coaxial system ¿¿ Television terminals

    Publication Year: 1953, Page(s):541 - 551
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9078 KB)

    Television terminals are required at circuit ends of the L3 coaxial system, at the transmitting end to condition video signals for carrier transmission, and at the receiving end to detect the transmitted signals. Special signal characteristics, that is, a degree of modulation which exceeds the value commonly referred to as 100 per cent modulation, require departures from standard modulating and de... View full abstract»

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  • A universal meter for measuring voltages at high impedances, micromicroamperes, and insulation resistance

    Publication Year: 1953, Page(s):551 - 555
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3687 KB)

    This paper describes a multipurpose instrument which can measure direct voltages in high-impedance circuits, small direct currents, and high resistances with good accuracy. The basic detector is a chopper-type stabilized feedback amplifier which is entirely a-c powered. View full abstract»

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  • Technical characteristics of FTL type no. 20-B UHF television transmitter

    Publication Year: 1953, Page(s):555 - 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4842 KB)

    The technical objectives of the design of a 1-kw ultrahigh-frequency television transmitter and the methods employed for achieving the desired results are outlined. The aural transmitter is described and details are given for the design of the frequency-lock system, which insures frequency stability of the aural relative to the visual transmitter. A single crystal-controlled oscillator is used to ... View full abstract»

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  • Block-diagram solutions for vacuum-tube circuits

    Publication Year: 1953, Page(s):561 - 567
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4515 KB)

    MANY AUTHORS1¿7 of textbooks on electronics begin their discussion of feedback amplifiers with the block diagram given by Black.8 The general gain equation $A^{prime} = {A over 1-AB} eqno{hbox{(1)}}$ in which A is the gain without feedback and ß is the feedback fraction, is then derived, and the beneficial effects of feed back are discussed. In dealing with specific circuits, however, it is a co... View full abstract»

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  • A progressive code digital quantizer

    Publication Year: 1953, Page(s):567 - 571
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3578 KB)

    The analog-to-digital converter described receives analog information obtainable from a graph reader or other analog source and gives a corresponding numerical indication. A progressive coding scheme is used to lessen chances of wrong readings. Several circuits are given for obtaining digital indication, the basic principle being based on comparing the analog voltage with the sum of a finite geome... View full abstract»

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  • A permeability analyzer for magnetic amplifier cores

    Publication Year: 1953, Page(s):572 - 576
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4038 KB)

    This paper covers the theory and design of an instrument which measures, with the aid of an oscilloscope, the differential permeability of toroidal cores used in magnetic amplifiers. Additions and modifications are discussed which adapt the instrument for rapid selection of cores for production use, using a meter for an indicator. An important feature of the device is that all measurements are mad... View full abstract»

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  • Forcing function generator employing conductive plastic

    Publication Year: 1953, Page(s):576 - 581
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4345 KB)

    This paper describes a forcing-function generator which uses a conductive-plastic potentiometer to provide a forcing-function signal for testing servo systems and components. The unit described gives a sine-wave signal, but methods for generating a square wave or triangular wave are also discussed. A phase-measuring device is made an integral part of the function generator, and allows output versu... View full abstract»

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  • Synchronized magnetic tape recording

    Publication Year: 1953, Page(s):581 - 586
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3942 KB)

    MOTION PICTURES have obviously required synchronized sound to match picture and words in all released prints. Perforated film has been the usual answer to this requirement ever since sound was added on film. But now that magnetic recording has shown such tremendous opportunities in quality and economy, the use of this facility for sound for motion pictures is immediately attractive. One answer has... View full abstract»

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  • Protection of wire communication facilities serving power stations and substations

    Publication Year: 1953, Page(s):587 - 592
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5445 KB)

    THIS DISCUSSION has to do with protective devices provided in the telephone system to furnish protection to telephone equipment and to personnel having occasion to use or maintain this plant. Particularly, the discussion will deal with protection available for use on circuits serving power stations and substations. View full abstract»

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  • The map method for synthesis of combinational logic circuits

    Publication Year: 1953, Page(s):593 - 599
    Cited by:  Papers (113)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5354 KB)

    THE SEARCH for simple abstract techniques to be applied to the design of switching systems is still, despite some recent advances, in its early stages. The problem in this area which has been attacked most energetically is that of the synthesis of efficient combinational that is, nonsequential, logic circuits. View full abstract»

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  • The use of steel sheet for the construction of shielded rooms

    Publication Year: 1953, Page(s):599 - 605
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6031 KB)

    LOW-LEVEL electronic or electrical measurements are particularly susceptible to errors introduced by external electromagnetic influences. The coupling of spurious electromagnetic energy into a measuring system not only may result in the receipt of false information but also can sometimes cause the complete masking of the desired data as well. For these reasons, many low-level measurements, such as... View full abstract»

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  • The control of noise and crosstalk on N1 carrier systems

    Publication Year: 1953, Page(s):605 - 611
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6960 KB)

    THE 12-channel N1 carrier system is designed primarily for short- and medium-haul service and to make use of existing, and new, cable plant with a minimum of special treatment. As compared to other types of carriers, the lower transmission levels of the N1 system tend to make it more susceptive to interference from external sources. The use of higher line frequencies with the corresponding decreas... View full abstract»

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  • A-C null-type recorder with balancing amplifier which provides damping and suppresses the quadrature component

    Publication Year: 1953, Page(s):611 - 617
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5432 KB)

    ELECTROLYTIC conductivity is a good example of a measurement which can be made most satisfactorily by using an a-c null-type instrument. The use of alternating current instead of direct current reduces polarization at the electrodes. The use of a null-type recorder permits the measurement of conductivity directly by means of a Wheatstone bridge, thus avoiding the need for voltage regulation. This ... View full abstract»

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  • Basic concepts in the analysis of stationary electric circuits

    Publication Year: 1953, Page(s):617 - 625
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8165 KB)

    THE NEED FOR and part of the purpose of this paper is demonstrated by the following example: Fig. 1 shows a conducting ring linked by magnetic flux ¿. Three identical voltmeters are connected symmetrically around the ring as shown. What will be the readings of the voltmeters in terms of the rate of change of the flux d¿/dt and the ring resistance R? View full abstract»

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  • A commutatorless D-C tachometer

    Publication Year: 1953, Page(s):625 - 629
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4020 KB)

    IN MANY applications the commutator noise produced by conventional tachometers presents great problems. This is particularly true in cases where it is desirable to measure speed variations which have the same frequency components as the commutator noise. It is also true in some servomechanism systems where the commutator noise will saturate the amplifiers or will introduce a spurious response. View full abstract»

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  • Theory of magnetic amplifiers with square-loop core materials

    Publication Year: 1953, Page(s):629 - 640
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7989 KB)

    The purpose of this paper is to explain the operation of magnetic amplifiers and to express power out, power gain, and time constant of the amplifier in terms of core and rectifier properties. The magnetic amplifiers under discussion are of the so-called low-control circuit-impedance type.1 To reduce the complexity of the analysis, many simplifying assumptions are made. While these assumptions int... View full abstract»

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  • Propagation mechanism of impulse corona and breakdown in oil

    Publication Year: 1953, Page(s):641 - 648
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6477 KB)

    The breakdown mechanism of oil dielectric has not been fully understood. Information on impulse corona and breakdown are particularly meager. Breakdown theories postulated in the past are, in general, based on voltage measurements and are mostly restricted to uniform field conditions and slow-varying voltages. In the nonuniform field, previous results1 obtained with a point-to-plane configuration ... View full abstract»

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  • Pulse response characteristics of rectangular-hysteresis-loop ferromagnetic materials

    Publication Year: 1953, Page(s):648 - 656
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7239 KB)

    MAGNETIC CORES made with rectangular-hysteresis-loop ferromagnetic materials have recently gained prominence as binary elements in digital data-processing machines. The ability of the core to store binary information reliably and without power dissipation, and the ease with which the information can be read out or changed in a few microseconds make the core a useful and versatile component. Wherev... View full abstract»

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  • The permeability of silicon-iron at very low flux densities

    Publication Year: 1953, Page(s):656 - 664
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7885 KB)

    THE initial permeability of magnetic materials is a characteristic of great theoretical as well as practical importance. By definition, the initial permeability is equal to the ratio of the peak value of the flux density to the peak value of the exciting magnetizing field, when the latter approaches the value of zero. Due to the difficulties encountered in measuring the true initial permeability, ... 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