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Proceedings of the IRE

Issue 7 • Date July 1950

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Displaying Results 1 - 25 of 27
  • Table of contents

    Publication Year: 1950 , Page(s): 721
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  • William R. Hewlett, Director-at-Large, 1950-1951

    Publication Year: 1950 , Page(s): 722
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  • Radio Is Big Business!

    Publication Year: 1950 , Page(s): 723
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  • Management of Research and Development

    Publication Year: 1950 , Page(s): 724 - 725
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  • Correction

    Publication Year: 1950 , Page(s): 725
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  • Crystal Counters

    Publication Year: 1950 , Page(s): 726 - 740
    Cited by:  Papers (2)
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    This paper gives a general account of the recently discovered conduction type counters. Among the topics discussed are: The nature of the counting phenomenon, preparation of crystals, types of useful crystals, experimental technique, polarization, speed, limitations and comparisons with other types of counters. View full abstract»

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  • The Recording Storage Tube

    Publication Year: 1950 , Page(s): 740 - 747
    Cited by:  Papers (6)
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    The recording tube is a cathode-ray type of storage tube embodying a new operating principle which enables reading to be accomplished without disturbing the information written into the tube. An output signal comprising a full modulation of several microamperes can be read out of the tube for 20,000 complete scannings of the storage surface with no appreciable deterioration in the signal quality and only a few per cent decrease in signal level. The output signal may be observed on a monitor tube which is scanned in synchronism with the reading beam and it may also be observed directly on a fluorescent screen within the recording tube. The theory underlying the operation of the recording tube is developed in detail. View full abstract»

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  • Distributed Amplifiers: Practical Considerations and Experimental Results

    Publication Year: 1950 , Page(s): 748 - 753
    Cited by:  Papers (16)  |  Patents (1)
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    The principle of distributed amplification has recently been proposed as a means for obtaining amplification with conventional vacuum tubes over very great bandwidths. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring. This paper cites experimental results which essentially corroborate the predictions based on first-order theory. It is pointed out that when extreme bandwidths are sought, these predicted characteristics are modified by several factors which are difficult to control in actual practice. Corrective methods are available, however, which permit a limited control over these modifying effects. These methods are discussed and their applications are illustrated by measurements on actual amplifiers with pass-bands on the order of 200 to 300 Mc. View full abstract»

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  • The Design of Wide-Band Phase Splitting Networks

    Publication Year: 1950 , Page(s): 754 - 770
    Cited by:  Papers (24)  |  Patents (6)
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    A number of articles and patents dealing with the properties and design of phase splitting networks, particularly in conjunction with single sideband modulators, have been published in the last few years. However, all of them have been restricted either to particular methods of design or to a particular number of design parameters. The present paper gives the results of a general investigation of phase splitting networks, dealing separately with network analysis, network synthesis and performance curve approximation problems. For the most important types of curve approximation, Taylor and Tchebycheff approximations, explicit formulas for any number of design parameters and for any required closeness of approximation are stated. Alternatives to the classical all-pass lattice network are given, and dissipation compensated phase shift networks are developed. In this way, clear and comparatively simple design instructions for simple as well as for difficult specifications for phase splitting networks are obtained. Furthermore, it is believed that some of the theoretical results obtained and methods developed, e.g., the Taylor and Tchebycheff approximations, the method of obtaining dissipation compensation, one of the methods of network synthesis, and the representation of approximating curves as iterated functions of two variables, with fractional index of iteration, are novel and of general theoretical interest. View full abstract»

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  • Detection of a Pulse Superimposed on Fluctuation Noise

    Publication Year: 1950 , Page(s): 771 - 774
    Cited by:  Papers (20)
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    Given a known pulse superimposed on fluctuation noise having a known spectrum, we determine the frequency response of that linear device which would give the maximum value for the ratio between peak amplitude of the signal and the root-mean-square of the noise at the output. This result is applied to the case in which the fluctuation noise has a flat spectrum, and it is shown that in that case the optimal network is physically realizable if the pulse differs from zero for only a finite interval of time. The noise-suppressing efficiency of a conventional RC circuit is computed for pulse shapes of practical interest. View full abstract»

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  • The Measurement of Contact Difference in Potential on Certain Oxide-Coated Cathode Diodes

    Publication Year: 1950 , Page(s): 774 - 776
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    Contact difference in potential for a conventional-type oxide-coated cathode diode is defined in terms of voltage required to establish zero field between the anode and cathode. Contact difference in potential has been found to be relatively unaffected by a wide fange of impurities added to the coating. Tests have shown that the Ectmeasurement is a sensitive technique for observing changes which take place on an initially clean anode. View full abstract»

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  • Microwave Attenuators for Powers up to 1,000 Watts

    Publication Year: 1950 , Page(s): 777 - 780
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    A new type of high-power, broad-band probe attenuator is described which operates on a capacitance-divider principle. A typical design reduces input powers up to 1,000 watts, by a fixed ratio, to a low level which can be conveniently measured by bolometric means. The prototype consists of a probe, a buffer-equalizer attenuator, and a lossy tapered matched load. Two designs are required to cover the frequency band 1,000 to 10,000 Mc with relatively constant attenuation and voltage standing-wave ratio below 1.30. View full abstract»

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  • Microwave Attenuation Statistics Estimated from Rainfall and Water Vapor Statistics

    Publication Year: 1950 , Page(s): 781 - 785
    Cited by:  Papers (19)
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    Annual distribution curves are obtained for values of total atmospheric attenuation over a 50-km path and a 1-km path at Washington, D.C. These results are obtained by analyzing the available meteorological data, though these are usually ill-suited to the purpose; theoretical coefficients are used for converting into radio attenuation values. The problem of obtaining rainfall rates on the longer path is solved empirically using data from a network of rain gauges; these data, together with additional inference, indicate that annual statistics for hourly point depths may be interpreted as equivalent to instantaneous rates on a path about 50 km long. Extensions of the results to other portions of the country are discussed. View full abstract»

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  • The Permittivity of Air at a Wavelength of 10 Centimeters

    Publication Year: 1950 , Page(s): 786 - 790
    Cited by:  Papers (3)
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    This paper reports measurements of the permittivity of moist air under different conditions of pressure, temperature, and water-vapor content taken at a frequency of 3,036 Mc. The method and apparatus used are described. Results of observations made are given, and their probable accuracy is discussed. View full abstract»

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  • The Beacon Technique as Applied to Oblique Incidence Ionosphere Propagation

    Publication Year: 1950 , Page(s): 791 - 792
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    A method is shown for determining transmission time for each mode of transmission via the ionosphere and obliquely incident thereupon. The method makes use of an interrogator-responsor at the transmitting site and a beacon transpondor at the receiving site. Limitations of the method are discussed and preliminary results are shown for a 1,500-mile, north-south path. View full abstract»

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  • Low-Q Microwave Filters

    Publication Year: 1950 , Page(s): 793 - 796
    Cited by:  Papers (11)
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    Waveguide bandpass transmission filters, each stage of which is composed of two similar irises spaced a distance s apart, are considered. The distance between stages for effectively quarter-wave coupling is shown to be s±1/4λg/g. The loaded Q of one stage is computed, and the frequency consciousness of the iris susceptance is shown to have no effect on the spacing condition, but to have a substantial effect upon the loaded Q, especially for low values of Q. View full abstract»

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  • Continuously Adjustable Electronic Filter Networks

    Publication Year: 1950 , Page(s): 796 - 798
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    Standard network theory is used to explain the advantages of RC networks in the design of filters with frequency response characteristics which are continuously adjustable over several decades. The theoretical discussion is followed by a review of some simple circuits from which most filter characteristics may be obtained. The shape of the response as a function of frequency is determined largely by passive networks. Tubes serve to isolate the passive networks and, in some cases, to invert their response by means of feedback amplification. An example of the method is demonstrated by the design of an adjustable low-pass high-pass filter. View full abstract»

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  • Design Relations for the Wide-Band Waveguide Filter

    Publication Year: 1950 , Page(s): 799 - 803
    Cited by:  Papers (6)  |  Patents (1)
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    Design formulas are derived and presented graphically for a wide-band waveguide filter structure analyzed in a previous paper. The design procedure is outlined and a brief example given. Experiments indicate that the design cutoff frequencies and the infinite-attenuation frequency may be relied upon within one or two per cent. View full abstract»

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  • Slot Radiators

    Publication Year: 1950 , Page(s): 803 - 806
    Cited by:  Papers (3)
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    The electromagnetic fields throughout all of space produced by an excited finite length slot in an infinite extent perfectly conducting metallic sheet have been calculated by the double current sheet diffraction formula. The space dependence of the fields is the same as that of a thin wire antenna, but with the electric and magnetic fields interchanged. An integration of Poynting's vector over the surface of the slot gives an input resistance of 363 ohms for a center-driven half-wavelength slot. The mutual admittance between slots necessary in slot array calculations is also determined. View full abstract»

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  • On the Existence of a Surface Wave in Dipole Radiation over a Plane Earth

    Publication Year: 1950 , Page(s): 807 - 812
    Cited by:  Papers (4)
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    In a paper published in 1909, Sommerfeld stated the existence of a surface-type wave in the radiation of a vertical Hertzian dipole over a plane earth. Weyl, in 1919, objected to this solution. Despite a great number of papers on this problem, it had not been definitively settled so far. Its solution is given in the present paper by proving in a quite general way that this surface wave cannot be included in the said dipole radiation and by pointing out a thusfar hidden error in Sommerfeld's computation. View full abstract»

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  • An Analysis of Triple-Tuned Coupled Circuits

    Publication Year: 1950 , Page(s): 813 - 822
    Cited by:  Papers (2)
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    An analysis is given of triple-tuned coupled circuits for high-Q cases in which the couplings between circuits are kept small and the response is symmetrical about a reference frequency. Both synchronously tuned and asynchronously tuned cases are investigated in detail. Universal response curves are derived and contour plots of gain bandwidth product are given. The results for the transitional and triple-peak response cases are compared with double-tuned coupled circuits. The advantages of triple-tuned circuits are shown to be their more uniform response in the pass band and fifty per cent better sideband selectivity. View full abstract»

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  • Contributors to the Proceedings of the I.R.E.

    Publication Year: 1950 , Page(s): 822 - 825
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  • Correspondence

    Publication Year: 1950 , Page(s): 825 - 826
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  • Institute news and radio notes

    Publication Year: 1950 , Page(s): 827 - 831
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  • Books

    Publication Year: 1950 , Page(s): 832
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Aims & Scope

This Periodical ceased production in 1962. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope