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Radio Engineers, Proceedings of the Institute of

Issue 9 • Date Sept. 1933

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  • [Front cover]

    Publication Year: 1933 , Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Publication Year: 1933 , Page(s): c2
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  • Contents

    Publication Year: 1933 , Page(s): i
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  • General Information

    Publication Year: 1933 , Page(s): ii
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  • Institute sections

    Publication Year: 1933 , Page(s): iii
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  • Geographical Location of Members Elected August 2, 1933

    Publication Year: 1933 , Page(s): iv
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  • Applications for Membership

    Publication Year: 1933 , Page(s): v
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  • Officers and Board of Directors, 1933

    Publication Year: 1933 , Page(s): vi
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  • Institute news and radio notes

    Publication Year: 1933 , Page(s): 1233 - 1237
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  • Errata [in ""Transmission Curves of High-Frequency Networks," ibid., Jan 1933]

    Publication Year: 1933 , Page(s): 1238
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    The author has brought to the attention of the editors errors to various equations that occurred in his paper, "Transmission Curves of High-Frequency Networks," which was published in the January, 1933, issue of the Proceedings. The pages affected are 122, 123, 130, 138 and 139. View full abstract»

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  • The Radio Patrol System of the City of New York

    Publication Year: 1933 , Page(s): 1239 - 1251
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    The application of radiotelephony to municipal police work in New York City is described from the organization viewpoint. Brief references are made to historical backgrounds and description of apparatus, and the steps taken to select a receiver suitable for local conditions are outlined. The method of controlling the patrolforce by radio is described at some length with examples, and a summary of results during the first year is given to show the value of this means of communication to police work. View full abstract»

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  • An Outline of the Action of a Tone Corrected Highly Selective Receiver

    Publication Year: 1933 , Page(s): 1252 - 1264
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    The action of a highly selective simple tuned circuit located between a source of radio-frequency energy and the terminals of a detector is discussed. Next, the effect of linear and of square-law detection together with an audio-frequency tone correction system is described. Various interference conditions are analyzed with the aid of graphical construction. View full abstract»

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  • A Study of Reception from Synchronized Broadcast Stations

    Publication Year: 1933 , Page(s): 1265 - 1301
    Cited by:  Papers (2)
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    The present paper gives the practical results of an extensive analysis of the detection of two modulated waves of identical carrier frequency. It is shown that the total effects of time delay in the program distribution circuits, differences in circuit elements in the two transmitters, and differences in path lengths of the two signals in traveling from their respective transmitters to the receiving point, may all be expressed in terms of two fundamental angles, γ and β. γ is the phase angle between the two carriers at the receiving point, and β is an angle determining the relation between the side frequencies received from the two stations. At any given point there will be a different value of β for each modulation frequency. Analyses in terms of β and γ yield quantitative descriptions of the distortions present in the rectified wave. From these results it is possible to determine how the distortions vary from point to point in space and upon what significant quantities they are dependent. Experimental work has been carried out in the laboratory which confirms the results of the theoretical analysis and which shows in a striking manner the effects of small time delays on the quality of the received signal. This work agrees with theory in showing that time delays, of the order of 200 microseconds, may be responsible for serious distortion, and that a delay as small as 50 microseconds requires a 2:1 carrier ratio to prevent distortion. View full abstract»

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  • Some Characteristics of Ultra-High-Frequency Transmission

    Publication Year: 1933 , Page(s): 1302 - 1316
    Cited by:  Papers (1)
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    A receiving equipment and calibration method is described for the measurement in absolute units of 5.1-meter (58.8-megacycle) field strengths. A transmitter of low power is used. The attenuation of the waves is discussed, and a field strength contour map of Ann Arbor, Michigan, and vicinity is presented. The attenuation constant is found to be 0.36. Experiments on receiving antenna lengths show the importance of a properly resonant receiving antenna. The field distribution around the transmitting antenna is investigated by rotations of the antenna with the receiver at a fixed location. The polarization of the waves is studied, and results indicate that horizontally polarized radiation is more rapidly attenuated than is the vertically polarized. View full abstract»

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  • Notes on Television Definition

    Publication Year: 1933 , Page(s): 1317 - 1327
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    This paper describes a qualitative study of the degrees of television definition required for the adequate portrayal of various scenes under various conditions. Still photographs transmitted by telephoto are examined. It is found that 60-line, 120-line and higher orders of television definition may be suitable for certain missions conditioned by general factors such as the comprehensiveness of the scene to be portrayed. View full abstract»

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  • A Magnetostriction Filter

    Publication Year: 1933 , Page(s): 1328 - 1338
    Cited by:  Papers (3)
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    A rod of monel metal supported at its mid-point and fitted with two coils, one on each end, shielded from each other, and supplied with a polarizing magnetic field, resonates sharply at its natural longitudinal frequency to a voltage impressed on one coil, and induces a voltage in the other only while vibrating. It is thus a very selective band-pass filter. The attenuation is more than sixty decibels off resonance and about twenty at resonance. The band is about seventy cycles wide, thirty decibels up from the minimum, when the resonant frequency is 20,000 cycles. The effect of heat treatment and the design of the coils and shields are discussed. Actually two rods in series, coupled by a vacuum tube are used. This gives a curve only seventy cycles wide, as much as sixty decibels up from the minimum. The attentuation is found to be low at frequencies below about 8,000 cycles and there is a rather sharp minimum at 16,000 cycles due to some mode of vibration other than the longitudinal one. These defects, however, may easily be remedied by the use of a high-pass filter of conventional design. View full abstract»

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  • Properties of Mycalex

    Publication Year: 1933 , Page(s): 1339 - 1342
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    This paper presents data recently obtained on physical and electrical properties of Mycalex, a material having extensive and growing applications in the design of radio apparatus. The electrical data relate to the frequency range to 100,000 kilocycles. View full abstract»

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  • Radiation Resistance of Concentric Conductor Transmission Lines

    Publication Year: 1933 , Page(s): 1343 - 1353
    Cited by:  Papers (3)
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    An expression for the radiation resistance of a cylinder is derived, following the "tangential field" or "induced electromotive force" method as adapted by Pistolkors. The result is used to determine the radiation resistance of a segment of a concentric cylinder transmission line, as used in ultra-high-frequency oscillator circuits. A comparision is made with the more conventional parallel wire line segment. Numerical computations are made for the case of a line one-half wavelength long, with a radius (for the concentric line) and a spacing (for the open line) of one-twentieth of a wavelength. These are believed to be the largest dimensions to be encountered in practice. The resistances are, respectively, 0.086 ohm and 3.02 ohms, showing the concentric line to be definitely superior as far as radiation losses are concerned. View full abstract»

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  • Low-Frequency Radio Receiving Measurements at the Bureau of Standards in 1931 and 1932

    Publication Year: 1933 , Page(s): 1354 - 1363
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    This report gives the monthly and annual averages of field intensities of ten European and three American low-frequency transatlantic radio stations, between frequencies of 16 and 24 kilocycles, and the field intensity averages of atmospherics on 15 and 23 kilocycles, observed at the Bureau of Standards, for the years 1931 and 1932. Measurements were made by the telephone current comparison method. Annual average curves of daylight field intensities of European signals and afternoon atmospherics on 23 kilocycles are shown with the corresponding yearly averages of sun spot numbers. A monthly average field intensity curve of Tuckerton WCI, 18.4 kilocycles, shows a return from the high values obtained in 1930 and 1931 to the average value of previous years. Some correlations between polarization of the reflected wave and sun spot numbers derived from a year of continuous recording of Tuckerton WCI, on loop antennas, are shown. The possibility of obtaining an independent value for the ground wave from such a series of observations is suggested. View full abstract»

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  • Note on a Modified Reactance-Frequency Chart

    Publication Year: 1933 , Page(s): 1364 - 1366
    Cited by:  Papers (1)
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    First Page of the Article
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  • Discussion on "Pittsburgh's Contributions to Radio" (S. M. Kintner)

    Publication Year: 1933 , Page(s): 1367
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  • Correction [to "On the calculation of radiation resistance of antennas and antenna combinations, " by R. Bachman, ibid., Aug 1931]

    Publication Year: 1933 , Page(s): 1367
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    A correction is made to page 1480, equation (33) of the paper by Rudolph Bechmann, "On the Calculation of Radiation Resistance of Antennas and Antenna Combinations," which appeared in the August 1931 issue of Proceedings of the IRE. View full abstract»

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  • Book reviews

    Publication Year: 1933 , Page(s): 1368 - 1370
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  • Bookelts, catalogs, and pamphlets received

    Publication Year: 1933 , Page(s): 1371
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  • Radio abstracts and references

    Publication Year: 1933 , Page(s): 1372 - 1380
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Aims & Scope

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

Full Aims & Scope