By Topic

Radio Engineers, Proceedings of the Institute of

Issue 5 • Date Oct. 1924

Filter Results

Displaying Results 1 - 14 of 14
  • [Front cover]

    Page(s): c1 - c2
    Save to Project icon | Request Permissions | PDF file iconPDF (943 KB)  
    Freely Available from IEEE
  • Contents

    Page(s): 519
    Save to Project icon | Request Permissions | PDF file iconPDF (111 KB)  
    Freely Available from IEEE
  • General Information

    Page(s): 519
    Save to Project icon | Request Permissions | PDF file iconPDF (111 KB)  
    Freely Available from IEEE
  • Officers and Board of Direction, 1924

    Page(s): 520
    Save to Project icon | Request Permissions | PDF file iconPDF (64 KB)  
    Freely Available from IEEE
  • A Method of Measuring Radio Field Intensities and Atmospheric Disturbances

    Page(s): 521 - 532
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (928 KB)  

    The method of measuring radio signals here described depends on the determination of the equality of the sound intensities in the telephones from the signal and from a known alternating current preferably giving the same tone. The measured local current is taken from a thousand-cycle tuning fork oscillator and the electromotive force impressed on the telephones is controlled by a voltage divider. The errors of measurement may be under good conditions less than five percent, tho in case of spark signals and atmospheric disturbances when the two tones cannot be matched it will be very much greater. Special arrangements are described for measuring very strong signals and atmospheric disturbances. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discovery of a Place Where No Static Could Be Heard in August

    Page(s): 533 - 537
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    The origin of natural static near mountain peaks is described and compared, in its mode of production and character, with that produced by smoke precipitators. Some mountains are believed to be soucres of static, while others act as absorbing shields to signal and static. On these bases, a certain point near Ketchikan, Alaska, was found where static was not heard in midsummer, while signals were received from some directions but not from others. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Super-Heterodyne-Its Origin, Development, and Some Recent Improvements

    Page(s): 539 - 552
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3640 KB)  

    This paper describes the development of the super-heterodyne receiver from a wartime invention into a commercial form of broadcast receiver apparatus now available to the general public. The success of the development is due to the low filament consumption vacuum tube and to the reduction in the number of tubes required by self-heterodyning, reflexing, and improvement in transformer design. Instances are cited of trans-Atlantic and trans-continental reception of broadcast stations by completely portable sets constructed in accordance with the methods described. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transmitting Equipment for Radio Telephone Broadcasting

    Page(s): 553 - 577
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5176 KB)  

    The general transmission considerations applying to any system for the high quality transmission of speech or music are outlined briefly, and the specific requirements to be met by the various apparatus units in a radio broadcasting equipment are discussed in some detail. The standard Western Electric 500-watt broadcasting equipment, which has found application in some fifty of the larger stations in this country and abroad, is described. Its performance capabilities are illustrated and it is indicated that a standard of performance has been attained which renders possible reproductions not substantially different from the original. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Analysis of Two Triode Circuits

    Page(s): 579 - 603
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1640 KB)  

    Two typical triode circuits, used for obtaining regeneration by mutual induction, are examined analytically, with the idea of testing the results of the analysis by experiment. As the experiments were to be performed with a one thousand cycle current (because of the greater accuracy of measurement at this frequency) it was permissible to neglect the condensive coupling due to the tube elements, and furthermore, as the conditions for the starting of oscillations were to be determined, the current taken by the grid could be neglected as it is only one or two microamperes in the non-oscillatory state. Measurements made on the circuits, by using the alternating current bridge, confirm the theoretically derived relations to a remarkable degree of precision, showing that triode circuits are susceptible of accurate analysis. View full abstract»

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

    Page(s): 604 - 607
    Save to Project icon | Request Permissions | PDF file iconPDF (365 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experimental Determination of the Fundamental Dynamic Characteristics of a Triode

    Page(s): 609 - 622
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1352 KB)  

    By picking out the fundamental component only from the distorted current in a triode while functioning, the writer has found first new forms of dynamic characteristics for a triode, which are utilizable for solving various problems not hitherto satisfactorily solved (for example, modulation in radio telephony, the phenomenon of "Ziehen," or "pulling," and so on), and secondly that the grid current may reach a large value and that the factor or constant ν merits attention. Some experiments have been carried out relative to the voltage amplification factor for which a new expression has been found. The work is being continued. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A High Efficiency Vacuum Tube Oscillating Circuit

    Page(s): 623 - 650
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2088 KB)  

    A modified push-pull circuit is described in which approximately square waves of current are passed thru the two tubes alternately. High efficiency is obtained by superimposing upon the grid circuit a voltage proportional to current variations in the plate circuit. The circuit gives high output combined with high efficiency without shortening the life of the tubes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digests of United States Patents relating to radio telegraphy and telephony

    Page(s): 655 - 677
    Save to Project icon | Request Permissions | PDF file iconPDF (2891 KB)  
    Freely Available from IEEE

Aims & Scope

This Periodical ceased production in 1938. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope