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Proceedings of the IRE

Issue 6 • Date June 1950

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Displaying Results 1 - 25 of 32
  • Table of contents

    Page(s): 593
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  • John D. Reid, Regional Director, 1950-1951

    Page(s): 594
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  • Our New Environment of Decision

    Page(s): 595
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    First Page of the Article
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  • Distant Electric Vision

    Page(s): 596 - 608
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    An outline of the history of television is followed by a detailed description of the design and development of some English television pickup tubes. View full abstract»

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  • Who Is the True Inventor?

    Page(s): 609 - 611
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  • A Source of Error in Radio Phase Measuring Systems

    Page(s): 612 - 614
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    A source of error in radio navigation or distance-measuring systems involving the measurement of phase is discussed. Experimental evidence is given showing the effect of certain reradiating structures on the accuracy of such phase measurements. View full abstract»

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  • An Analysis of Some Anomalous Properties of Equiphase Contours

    Page(s): 614 - 618
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    If one thinks of the voltage of a radio signal as a function of the location of some target point, then the phase of this voltage is also such a function. One might imagine that since the voltage exhibits no peculiar properties, neither does the phase; but this is not true. There are many cases for which the phase becomes a multivalued function. This fact is very important in the theory of the phase measurement type of radio surveying or navigational systems; for the phase difference between two points depends not only on the location of the points, but also on the path over which the target is carried. View full abstract»

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  • A Microwave Propagation Test

    Page(s): 619 - 626
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    A description is given of a microwave propagation test which was conducted over a period of a year with simultaneous transmission on wavelengths of 16.2, 7.2, 4.7, and 3.1 cm over an unobstructed 42-mile overland path. Comparative charts depict variations in daily fading range, illustrate diurnal and seasonal characteristics of fading, and reveal the marked disparagement between winter and summer fading. Curves are presented showing relative field-strength distribution for both winter and summer periods, and also the distribution of hourly minima. These curves may be useful in considerations bearing on continuity of service that may be expected with relation to wavelength and to time of day, winter or summer. View full abstract»

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  • Magnetic Triggers

    Page(s): 626 - 629
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    Magnetic cores of fairly rectangular hysteresis loop material are used as a trigger device. Magnetic fluxes are used instead of electrical currents to indicate the two stable positions of the tigger. This paper shows how the magnetic flux level may be detected without a mechanical motion. The construction and functioning of several types of such magnetic triggers are discussed. View full abstract»

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  • Feedback in Very-High-Frequency and Ultra-High-Frequency Oscillators

    Page(s): 630 - 632
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    This paper covers a study of feedback considerations in low-power negative-gnrd triode oscillators for the frequency range of 100 to 1,000 Mc. Discussion is mainly confined to oscillators using a single tuned circuit between grid and plate in the modified Colpitts circuit wherein the feedback is provided by the internal tube capacitances. The optimum feedback conditions are derived, and the analysis is applied to several typical oscillators. View full abstract»

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  • Ultra-High-Frequency Triode Oscillator Using a Series-Tuned Circuit

    Page(s): 633 - 635
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    As the conventional triode oscillator is applied to higher and higher frequencies, one or both of two phenomena finally prevent oscillation. These phenomena are transit-time effects and self-resonance of the tube elements. The analysis described in this paper refers these effects to the resistance and reactance requirements of the tube upon the external circuit. In those instances where a given triode is limited primarily by the reactance effects, due to large lead inductance, it is shown that the self-resonant frequency of the tube is not the upper limit of oscillation if one departs from the conventional parallel-tuned circuit and uses a series-tuned circuit instead. View full abstract»

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  • The Theory of a Three-Terminal Capacitor

    Page(s): 635 - 636
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    Theoretical equations are derived for the insertion loss of a three-terminal capacitor which check the experimental curves within their precision of measure. The condenser is assumed to behave like some equivalent transmission line and the line constants of this line determined as a function of frequency. Skin effect and proximity effect are taken into consideration, and engineering curves are plotted to make the prediction of the behavior of such a condenser easy to determine. View full abstract»

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  • Maximum Tank Voltage in Class-C Amplifiers

    Page(s): 637 - 644
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    Theoretical considerations are presented to justify the frequent appearance in class-C amplifiers of radio-frequency plate voltages which are greater than the dc plate voltage. A method is developed for predicting the magnitude of this rf voltage under any given set of conditions. This method is then experimentally verified for a given case. View full abstract»

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  • A New Wide-Range, High-Frequency Oscillator

    Page(s): 645 - 650
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    A new tube is described which is fundamentally a Barkhausen oscillator with an electron gun and a cavity resonator. The tube is inherently inefficient, but is capable of tuning over extremely wide frequency ranges. For one single tube, for instance, the wavelength ranges from 4.5 to 12 cm and the output power from 0.1 to 1.0 watt. View full abstract»

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  • A Philips-Type Ionization Gauge for Measuring of Vacuum from 10-7to 10-1mm. of Mercury

    Page(s): 651 - 654
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    A Philips (Penning)-type ionization gauge is described which, unlike most former gauges of this type described in the literature, is capable of measuring vacuum down to 10-7mm of Hg. Construction and operation details of the gauge are given in addition to its advantages and disadvantages as compared to hot-cathode-type ionization gauges. View full abstract»

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  • Cathode-Coupled Multivibrator Operation

    Page(s): 655 - 656
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    An approximate analysis of the cathode-coupled multivibrator is given. The result is an expression for the period of the output pulse in terms of the circuit elements, rather than voltages which have to be determined graphically. A series expansion of the final expression is used to show that the output period is nearly a linear function of one of the voltages in the circuit, and can be made more nearly linear by a proper choice of the circuit parameters. View full abstract»

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  • An Impulse Generator-Electronic Switch for Visual Testing of Wide-Band Networks

    Page(s): 657 - 661
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    The impulse generator-electronic switch is an instrument developed primarily to facilitate the design and production of radar networks such as delay, pulse-forming, and sweep networks. The instrument may be used to test any network that can be arranged to store a dc charge. Discharge characteristics of microsecond order, produced by a reference network and the network under test, are simultaneously displayed in pictorial form for comparative measurements. The first part of the paper describes representative applications and, with the aid of cathode-ray-oscilloscope traces, illustrates the simplicity of performance; the second part describes the circuit functions in detail. View full abstract»

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  • Intermediate-Frequency Gain Stabilization with Inverse Feedback

    Page(s): 662 - 667
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    Increased gain stability and gain-bandwidth product result from the use of inverse feedback in an intermediate-frequency amplifier. Improvement in gain stability is related to the number of cascaded stages, the stage gain, and the magnitude of the feedback. A circuit is described which uses feedback over a pair of cascaded stages. Generalized selectivity curves for this feedback couple axe shown, and the design procedure is outlined. A description of an experimental amplifier concludes the paper. View full abstract»

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  • The Application of Direct-Current Resonant-Line-Type Pulsers to the Measurement of Vacuum-Tube Static Characteristics

    Page(s): 668 - 670
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    In order to utilize a power tube efficiently, the static characteristics of this tube must be known. From these characteristics, optimum load lines may be determined and circuit components of the equipment may be defined. The problem of obtaining these characteristics is usually not a simple one, due to the power-input limitations put upon a tube. For this reason, characteristic curves were previously plotted by capacitor-discharge methods or were calculated mathematically, using low power points as references. This paper describes a method of obtaining this information, employing pulse circuits commonly used in radar transmitters. View full abstract»

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  • Wide-Range Tunable Waveguide Resonators

    Page(s): 671 - 679
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    A study is made of the design of broad-band (2: 1 tuning range) resonators for use with reflex klystrons of the external cavity type. The resonators considered are variations of a general type consisting of a section of waveguide with movable shorting plungers at each end and the tube located at the center. They are divided into two groups: quarter-wave or fundamental mode resonators whose high-frequency limit is set by the physical size of the tube envelope, and three-quarter-wave resonators which allow operation up to the electronic limit of the tube. Methods of treating the mode interference problem are considered for both classes of resonators. View full abstract»

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  • The Effect of a Bend and Other Discontinuities on a Two-Wire Transmission Line

    Page(s): 679 - 682
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    The theoretical problem of a bend on a two-wire transmission line is analyzed by the vector-potential method. The equivalent circuit elements are obtained by comparing the variableline parameters near the bend with the conventional line parameters found on an infinite line. The effect of the nonrotational symmetry of the axial vector potential on the conductor surfaces is treated by an approximate method to obtain one of the equivalent series elements. Experimental values of the circuit elements for the bend were found to be in good agreement with the theoretical. Good agreement was also found between experimental and theoretical values for open-ended and bridged-end lines. View full abstract»

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  • Correspondence

    Page(s): 684 - 685
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    Freely Available from IEEE
  • Contributors to Proceedings of the I.R.E.

    Page(s): 686 - 688
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Aims & Scope

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

Full Aims & Scope