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Radio Engineers, Proceedings of the Institute of

Issue 5 • Date Oct. 1918

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Displaying Results 1 - 9 of 9
  • [Front cover]

    Publication Year: 1918 , Page(s): c1
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  • Information about the Society

    Publication Year: 1918 , Page(s): 229 - 230
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  • Contents

    Publication Year: 1918 , Page(s): 231
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  • Officers and Board of Direction, 1918

    Publication Year: 1918 , Page(s): 232 - 234
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  • Morris N. Liebmann [Obituary]

    Publication Year: 1918 , Page(s): 235
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  • Feasibility of the Low Antenna in Radio Telegraphy

    Publication Year: 1918 , Page(s): 237 - 265
    Cited by:  Papers (1)
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    This paper supplements a previous publication entitled "High versus Low Antennas in Radio. Telegraphy," in which it is shown that if the antenna of a radio telegraph station consists of an extended horizontal network of wires mounted above a highly conducting plane, and if the mean radius of the capacity area is two or more times as great as any height above the plane at which it is feasible to mount the network, then the rate of radiation from the antenna at a given voltage and frequency, and the rate at which the antenna will ultimately be able to abstract energy from impinging (sustained) waves, are both independent of the mounting height. The conclusions in the previous paper are the result of a mathematical analysis for the hypothetical case in which the antenna is mounted over a highly conducting plane. The present paper deals mainly with those wasteful antenna and earth resistances which are common to the use of the low antenna both in sending and receiving. The distinction between the "low" antenna and the "ground" antenna is pointed out. The electrical constants of an antenna having the same radiation figure of merit as the Darien (Canal Zone) antenna, but mounted at an elevation of only 10 meters (33 feet), are contrasted with those of the Darien antenna. The wasteful resistances of this 10-meter Darien-equivalent are then computed. Of these losses, that in the vegetation growing under the antenna is found to be the most serious. View full abstract»

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  • Discussion

    Publication Year: 1918 , Page(s): 266 - 273
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  • The Amplification Obtainable by the Heterodyne Method of Reception

    Publication Year: 1918 , Page(s): 275 - 284
    Cited by:  Papers (1)
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    The author contrasts the Cohen theory that heterodyne amplification can be increased indefinitely by increasing the local current (using an ideal detector of unlimited current-carrying capacity) with the Liebowitz theory that the maximum "true heterodyne amplification" is four. It is then shown by several different methods of considering detector and heterodyne action as compared with chopper detection of received energy, that if the detector gives an audibility current proportional to the received current, the maximum amplification of audio power is 2.43, and does not increase indefinitely with the local current. With detectors giving an audibility current proportional to the square of the received current (e.g., ordinary contact detectors thru a considerable range), the amplification may greatly exceed four, and its excess over four cannot be accounted for on the basis of "increased detector efficiency," since a steady polarizing current will not produce the same increase. View full abstract»

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  • Further Discussion on "On the Interpretation of Early Transmission Experiments by Commandant Tissot and Their Application to the Verification of a Fundamental Formiula in Radio Transmission" by Leon Bouthillon

    Publication Year: 1918 , Page(s): 285
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Aims & Scope

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

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