By Topic

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

Issue 6 • Date Jan. 1961

Filter Results

Displaying Results 1 - 25 of 37
  • New television network switching facilities

    Publication Year: 1961 , Page(s): 625 - 634
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1708 KB)  

    "We now return you to our studio in New York." At this cue from the announcer the smiling face of the weather man in Chicago disappears from the screen of your television set and is replaced by that of a well-known news commentator. This change in the originating point of a television program is a familiar phenomenon to viewers and similar ??switches?? are performed in each television network many... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radio-frequency transmission line engineering

    Publication Year: 1961 , Page(s): 634 - 641
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2241 KB)  

    In the development of a transmission line, the engineer attempts to establish a criterion for minimum attenuation; minimum discontinuities, or minimum VSWR (voltage standing wave ratio); maximum power handling capability; maximum frequency range; ease of manufacture; and the ability to attach connectors having consistent and reliable electrical and mechanical qualities. This paper will discuss the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Centralized testing of a very-high-frequency mobile radio system

    Publication Year: 1961 , Page(s): 641 - 645
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1003 KB)  

    In 1946 the Pacific Telephone and Telegraph Company made plans for the installation of its first mobile radio channel in the Los Angeles (Calif.) basin. Since this initial installation the area has evidenced an insatiable demand for this type of service. By the end of 1960 the telephone companies serving the area plan to have all available channels in service. Fig. 1 is a block schematic of a typi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interstitial channels for doubling TD-2 radio system capacity

    Publication Year: 1961 , Page(s): 646 - 654
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1370 KB)  

    The td-2 microwave radio relay system at present provides six broadband channels in each direction of transmission in the frequency band between 3,700 and 4,200 mc (megacycles), each channel being capable of transmitting several hundred voice circuits.1 This paper describes arrangements and some of the technical problems involved whereby the number of broad-band channels can be doubled with no sig... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The 57A microwave path protection system: An automatic switching system for transmission protection of microwave radio-relay systems

    Publication Year: 1961 , Page(s): 654 - 659
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1078 KB)  

    The 57 A protection system is a fault-sensing and switching system, which serves as an automatic guardian of the quality of a broad-band (1,300 kc) transmission channel. Acting upon a loss in transmission level, or an increase in noise, it transfers a communication traffic load from a failing regular channel to a normally unassigned stand-by channel. The transmission protection afforded by the sta... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Telephone influence factor (TIF) and its measurement

    Publication Year: 1961 , Page(s): 659 - 664
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (965 KB)  

    From the earliest days of telephony the evaluation of message circuit noise has been an important problem. Of particular interest has been the evaluation of noise originating from harmonic components present in power system voltages and currents. Magnetic fields set up by power currents, and electric fields set up by power voltages, tend to induce voltages in nearby telephone conductors. Even a sm... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A transistor automatic gain control system for audio frequencies

    Publication Year: 1961 , Page(s): 664 - 669
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (841 KB)  

    Automatic gain control (AGC) circuits are useful in obtaining relatively constant output levels where the input signal may vary over a wide range. Several articles have been written covering methods of controlling transistor gain in intermediate radio-frequency circuits.1,2 The usual method employed is to change one of the transistor parameters by the application of an external signal. The two bas... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Datacom unit ¿ An experimental data transmission subset

    Publication Year: 1961 , Page(s): 669 - 673
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (937 KB)  

    The number of miles of telephone wire in the United States today runs well over the 240 million mark. This is enough to run 1,000 wires between here and the moon, or, if extended as a single pair, enough to carry on a telephone conversation with the sun. Also there are in use today, in this country alone, well over 60 million telephone instruments. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The new nation-wide telephone numbering plan

    Publication Year: 1961 , Page(s): 673 - 675
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (544 KB)  

    The present nation-wtde telephone numbering plan, adopted in 1947, was expected to last beyond the year 2000, but now it appears that it will be outgrown by about 1975. The telephone industry in the United States and Canada has, therefore, adopted a new plan with several times the code capacity of the present one which should last well into the next century. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A transistorized cable carrier repeater

    Publication Year: 1961 , Page(s): 675 - 680
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (859 KB)  

    This paper describes a repeater which was designed for a medium-haul cable-carrier system. It is called the Lenkurt type 4587 A repeater unit. By use of transistors, power requirements are minimized. By the use of conservative design techniques, a high degree of reliability is expected. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Miniaturized current transformers for multirange operation of milliammeter ink recorders

    Publication Year: 1961 , Page(s): 681 - 689
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1518 KB)  

    Conventional forms of multi-range current transformers with a rated output of 5 or 10 va (volt-amperes) cannot be employed for operation of standard moving-coil milliammeter ink recorders which require about 1.5 mw (milliwatts) for full-scale deflection. Recently developed a-c and d-c types of miniaturized current transformers using cores of thin molybdenum-permalloy tape and special construction ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Protection for underwater instruments

    Publication Year: 1961 , Page(s): 689 - 694
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (968 KB)  

    Waterproof cases for instruments, especially cameras, electronic flash lamps, and sonar drivers, are considered for external pressures up to 20,000 psi (pounds per square inch) which is adequate for the greatest known depths in the sea. Equations, charts, and experimentally determined values of failure are given for cylinders, end caps, and windows of various materials. Several types of pressure-r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experiments with air ions on the trachea

    Publication Year: 1961 , Page(s): 695 - 699
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (813 KB)  

    Man regularly encounters changing environmental conditions. Some of these changes are severe involving extreme discomfort, while others are so subtle as to pass unnoticed. Air ionization is one factor of environment that is properly classified as a subtle change for most people. Few are consciously aware of any change in air ionization, yet the physiological importance of air ions to the function ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power semiconductor ratings under transient and intermittent loads

    Publication Year: 1961 , Page(s): 699 - 706
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1284 KB)  

    Methods for rating semiconductor power rectifiers and controlled rectifiers under steady-state conditions are well established and accepted. These techniques assume uniform temperature across the entire semiconductor junction area and limit this temperature under different load and ambient conditions to a predetermined level consistent with good performance and high reliability.1,2Supplementary me... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A comparison or digital differential analyzer and general purpose equipment in guidance systems

    Publication Year: 1961 , Page(s): 706 - 708
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (593 KB)  

    Qualitative comparisons are often made between a digital differential analyzer (DDA) and a general purpose (GP) computer for real-time control applications. Such comparisons consider static and dynamic accuracy, flexibility, equipment complexity, solution stability, influence of random errors, and ability to cope with discontinuities. They do not clearly point to a machine for solution of a proble... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error-correcting codes for correcting bursts of errors

    Publication Year: 1961 , Page(s): 708 - 711
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (642 KB)  

    In data transmission systems that are subject to noise, it is found that errors do not occur randomly but in bursts. Consequently, much interest has centered lately on the problem of constructing suitable error-correcting codes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Amplidyne circuit analysis

    Publication Year: 1961 , Page(s): 711 - 715
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    A method is shown for obtaining an analog of a typical amplidyne which has four control windings. Both the need for electronic analog differentiators and the possibility of circuits containing even-numbered amplifiers which give rise to unstable oscillations have been eliminated by the use of inverse inductances.1,2 This makes it possible to have each amplidyne parameter represented by a computer ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Logical organization of the honeywell H-290

    Publication Year: 1961 , Page(s): 715 - 719
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    The minneapolis-honeywell Regulator Company's H-290 is a general-purpose digital computer which is provided with input and output paths which make it particularly easy to relate the computer to sensing and control devices. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient thermal impedance of semiconductor devices

    Publication Year: 1961 , Page(s): 719 - 726
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1301 KB)  

    In this paper the thermal behavior of the semiconductor device is referred to the junction. Devices consisting of multiple parts which are non homogeneous and with varying outlines are subdivided into homogeneous elements with simple outlines which are successively related to the junction. Thermal impedance calculations of cylindrical and spherical sectors are given numerically. Stationary thermal... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hybrid computers for process control

    Publication Year: 1961 , Page(s): 726 - 734
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1107 KB)  

    There is a need in industry for equipment of moderate complexity and cost capable of solving simple process control equations at high speed. Quite economical process control and processing of instrumentation data may be accomplished by a hybrid computer. This tool combines the best features of analog and digital systems with a simplicity and economy unavailable in either, to produce a unique combi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamic optimization and control of a stirred-tank chemical reactor

    Publication Year: 1961 , Page(s): 734 - 746
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1996 KB)  

    The control of a chemical plant may be viewed as an attempt to vary the plant inputs in such a way as to maximize a specified performance criterion, i.e., the average rate of return on investment. This must be done in the face of uncertainties as to the values of the parameters describing the process and specifying the economic performance criterion, and in spite of uncontrollable plant disturbanc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the response of linear systems to periodic excitations

    Publication Year: 1961 , Page(s): 746 - 749
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (730 KB)  

    The problem of finding the periodic response of a linear system to a non-sinusoidal periodic excitation is of continuing interest.1¿8 The following constitutes a brief summary of the existing methods of solving such problems: 1. The Fourier series. 2. Infinite series summation of transients. 3. Solution of a differential equation subject to matching conditions at the beginning and end of a cycle.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic memory drum design

    Publication Year: 1961 , Page(s): 749 - 756
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1337 KB)  

    A magnetic memory drum is a convenient, relatively cheap storage device of moderate speed and of large capacity. It comprises a cylindrical rotor, whose surface is coated with a magnetic material, rotating within a shroud which supports salient heads. Proper design requires an appreciation of the effect on performance of such factors as rotor eccentricity, head-setting variations, head manufacturi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new function generator

    Publication Year: 1961 , Page(s): 756 - 762
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1230 KB)  

    In analog computing technology as well as in the laboratory study of control instrumentation or simulation systems, it is frequently desirable to be able to provide a given arbitrary periodic function as a forcing function. However, no device will reproduce exactly every arbitrary function which might be required. For this reason, considerable effort has been applied toward the development of devi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Current-operated diode logic gates

    Publication Year: 1961 , Page(s): 762 - 772
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1907 KB)  

    The literature contains many articles on the design of voltage-operated diode logic gates. Perhaps the major disadvantage of this type of gate is the restriction of the design to two or three stages which does not, in general, allow realization of minimal networks or which alternately requires the insertion of a gain device to re-establish the voltage levels. This paper formulates the general real... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

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

Full Aims & Scope