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Proceedings of the IRE

Issue 1 • Date Jan. 1953

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Displaying Results 1 - 25 of 49
  • Information about the Society

    Page(s): 1
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  • Table of contents

    Page(s): 2
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  • General Information

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  • Contents of Volume 41 - 1953

    Page(s): 3 - 8
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  • Index to authors

    Page(s): 9 - 10
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  • Index to book reviews

    Page(s): 11
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  • Index to subjects

    Page(s): 12 - 15
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  • Nontechnical index

    Page(s): 16 - 18
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  • Back copies

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  • Current IRE Standards

    Page(s): 20
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  • Table of contents

    Page(s): [1]
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  • James W. McRae, President, 1953

    Page(s): 2
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  • The UHF Issue

    Page(s): 3
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    First Page of the Article
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  • Measurements of Some Operational Characteristics of an Amplitude-Modulated Injection-Locked UHF Magnetron Transmitter

    Page(s): 4 - 10
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    Measurements of the loop impedance of an amplitude-modulated injection-locked uhf magnetron looking from the transmission line toward the magnetron are presented. The loop impedance is computed from the voltage standing-wave ratio and the position of the minimum-voltage plane of the injection current reflected from the magnetron output loop. While the plate voltage is varied, the changes of the loop impedance are observed under specific conditions which are important for the proper performance of the resonant injection system. Analyses of the phenomena occurring in the output transmission line of the synchronized magnetron are described. Matched and decoupled resistive loads as well as a reactive load are presented to the magnetron at the high-power end of the modulation cycle. It is demonstrated that the load impedance seen by the magnetron steadily and substantially changes during an amplitude-modulation cycle. However, at the low-power end of a 100-per cent modulation cycle the load is constant, and the value of it for a given type of magnetron with a predetermined setting of the magnetron tuner depends only upon the carrier frequency. The changes of load during the modulation cycle are discussed. These are graphically represented by a special kind of circular diagram. View full abstract»

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  • An X-Band Sweep Oscillator

    Page(s): 10 - 13
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    A microwave sweep oscillator has been developed which sweeps the range of 8,500-9,500 mc. The RF amplitude over this band is maintained constant to within ± 0.1 db by means of a ferrite modulator unit connected in an amplitude-stabilizing feedback circuit. In addition to providing amplitude control, the ferrite unit also provides amplitude modulation at 1,000 cps of the swept cw source. The generator sweeps the band in about 1.5 seconds, making practical the presentation of network transmission characteristics on an oscilloscope. View full abstract»

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  • One-Kilowatt Tetrode for UHF Transmitters

    Page(s): 13 - 19
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    A forced-aircooled power tetrode capable of delivering 1,200 watts output in television service at frequencies up to 900 mc is described. Particular features of the design include a coaxial electrode structure, novel metal-to-ceramic seals, and a unipotential matdx-type cathode having a 120-volt heater. A discussion is included of the special parts-making techniques and precision assembly methods in which radio-frequency heating is used together with accurate jigging to maintain uniform electrode spacings. A typical 900-mc circuit for use with the tube is described and tube performance data as a cathode-driven amplifier are given. View full abstract»

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  • High-Power Klystrons at UHF

    Page(s): 20 - 25
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    A brief history of high-power cw klystron development and a classification of types of klystron are followed by a description of the three-cavity, gridless klystron amplifier with magnetic focusing, in general terms, and the Eimac 5-kw klystron for UHF-TV in more detail. This tube has cavities which are partly outside the vacuum system and contain ceramic "windows." The advantages of the klystron over the conventional negative-grid type of tube are reviewed from the standpoint of performance, and the main operational features are noted. View full abstract»

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  • A Floating-Drift-Tube Klystron

    Page(s): 25 - 31
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    This paper describes a theoretical and experimental investigation of a special form of klystron which seems to have many important uses as a frequency-modulated oscillator. Basically, it is a single-cavity, two-gap klystron with a floating drift tube between the two gaps. By applying a separate voltage to the floating drift tube it is possible to produce frequency modulation by varying the transit angle between the gaps in a similar manner to the frequency modulation produced in a reflex klystron. An examination of the theory indeed indicates that the theory of the floating-drifttube klystron (FDTK) and the reflex klystrons are essentially identical. One merely replaces the transit angle wherever it appears in reflex theory by the same number divided by a factor H, where H is the ratio of the effective voltages at the two gaps. However, in spite of this identity of theory, in practice the FDTK should have higher efficiency and power-handling capabilities merely because of its geometry. In addition, the absence of the reflection problem, i. e., of electrons transversing the same gap twice, eliminates all the difficulties connected with multiple transits which produce hysteresis, mode distortion, and the like, which are characteristic of many reflex klystrons. This prognosis fulfilled in the tube which was constructed. View full abstract»

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  • FM Distortion in Reflex Klystrons

    Page(s): 32 - 36
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    The harmonic distortion introduced by a reflex klystron used as a frequency-modulated transmitter is computed. The method used is to make a power-series expansion of the theoretical expression of frequency as a function of reflector voltage, and then to relate the coefficients of the power series to the harmonic-distortion components. The design of a reflex klystron for low distortion is briefly discussed. A novel technique was used to measure the harmonic-distortion components experimentally. The experimental results were in good agreement with the theoretical predictions. The distortion is low enough for the reflex klystron to be useful for many transmitter and relay applications. View full abstract»

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  • Theory of the Reflex Resnatron

    Page(s): 37 - 42
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    A qualitative and quantitative description is given of the interaction phenomena between density-modulated groups of electrons and a field which permits them to cross the gap of a resonant cavity twice. Based on the method of Lagrangian parameters, resonance conditions of transit time and field parameters are derived for maximum energy transfer. The theory is extended to account for the specific behavior of the reflex resnatron in terms of efficiency, amplitude modulation, and bandwidth. The results are compared with experiment. View full abstract»

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  • An Axial-Flow Resnatron for UHF

    Page(s): 42 - 46
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    A new design for a resnatron based on the axial flow of the electron stream has resulted in the development of a tube for uhf. The tube has been tested up to 29-kw cw power output at 420 mc with efficiencies from 45 to 75 per cent and power gains in excess of 10 db. The novel and general features of the mechanical design are described and the performance characteristics are given in curve and tabular form. View full abstract»

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  • RF Performance of a UHF Triode

    Page(s): 46 - 50
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    The details of techniques of measurements and the dynamic results obtained with a uhf triode are discussed. Performance characteristics in the vhf and uhf television bands are covered, and a comparison of gain and noise figures made with tubes now available for vhf amplifier service. View full abstract»

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  • UHF Triode Design in Terms of Operating Parameters and Electrode Spacings

    Page(s): 51 - 58
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    An approximate triode theory has been organized in terms of the operating parameters and electrode spacings so that, with the aid of graphical representations, the tube designer can readily and very quickly predict the RF performance of a grounded-grid amplifier or the effect thereon of changes in design parameters. It is thus possible to minimize the experimental work required to achieve a desired performance. The effects of changes in design parameters are shown by illustrative examples, and a study of these examples confirms that substantial improvements in the performance of present-day tubes cannot be obtained by minor changes in one or two parameters. Significant improvements may only be obtained by pushing all design parameters to the limit of practicability. The performance predicted by this theory is compared with experimental measurements of other workers with satisfactory agreement. It is concluded that the theory is quite adequate for design work. View full abstract»

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  • On Transformations of Linear Active Networks with Applications at Ultra-High Frequencies

    Page(s): 59 - 67
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    A relation similar to the familiar Star-Delta transformation is developed for linear active networks. Transformation formulas are derived for triode circuits under both negative-grid and positive-grid conditions. The result can be extended to tetrodes and pentodes. Applications of the analysis to vacuum tubes and circuits are given for illustration, with special considerations to uhf problems. View full abstract»

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  • Tuner for Complete UHF-TV Coverage without Moving Contacts

    Page(s): 67 - 72
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    A tuner covering the uhf television band continuously and having essentially constant selectivity over all of this band is described. A unique feature is that the tuner employs no moving contacts in the tuned circuits, and so avoids the well-known contact troubles. The circuit consists of a double-tuned preselector, a crystal mixer, a triode oscillator, and a cascode-type first intermediate stage. The two preselector circuits and the oscillator employ balanced parallel-rod constructions, each tuned with a movable capacitor element having surfaces shaped to give a linear displacement-frequency characteristic. Shielded compartments are provided for the three tuned circuits. The tuner input matches a 300-ohm antenna, and the output is suitable for feeding the conventional "40-mc" intermediate-frequency amplifier of a television receiver. Measurements of the performance show the noise figure to be 15 db or better over the band, the image rejection at least 43 db, and the transadmittance (which is a measure of sensitivity) 11 db, or better, above 1 millimho. Oscillator signal at the antenna terminals averages approximately 43 db below 1 volt. View full abstract»

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Aims & Scope

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

Full Aims & Scope