Proceedings of the Institute of Radio Engineers最新文献_第5页

The Causes for the Increase of the Admittances of Modern High-Frequency Amplifier Tubes on Short Waves 现代高频放大管对短波导纳增大的原因

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228494

M. Strutt, A. van der Ziel

{"title":"The Causes for the Increase of the Admittances of Modern High-Frequency Amplifier Tubes on Short Waves","authors":"M. Strutt, A. van der Ziel","doi":"10.1109/JRPROC.1938.228494","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228494","url":null,"abstract":"By recent measurements of input loss, output loss, and feed-back capacitance of modern high-frequency amplifier tubes (pentodes) up to 300 megacycles, a considerable increase of these values in the short-wave range has become manifest. Contrary to the opinion, expressed in several recent publications, for many types of valves the main cause of this increase must not be sought in electron-transit-time effects, but in the action of capacitances, mutual inductances, and self-inductances of the tube electrodes and of their leads within and without the tubes. A general theory of the effect of these quantities on input admittance, output admittance, feedback admittance, and mutual admittance is put forward for tetrodes, pentodes, hexodes, etc., used as high-frequency amplifiers. By three series of measurements it is shown, that about one to two thirds of the input damping of modern European high-frequency valves of normal dimensions on short waves must be ascribed to inductive effects and not to transit times. Several measurements on transit-time effects are described, showing that the transit time between the input grid and the screen grid may not be neglected as compared with the transit time between the cathode and the input grid. Theoretical formulas for inductive effects are well checked and those for transit-time effects are not so well checked by measurements. Causes for the latter deviations are given. Output admittance and feed-back admittance are almost wholly due to inductive effects in the short-wave region, as shown by several measurements described.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"1011-1032"},"PeriodicalIF":0.0,"publicationDate":"1938-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228494","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62307904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Characteristics of the Ionosphere at Washington, D.C., June, 1938 华盛顿特区电离层的特征，1938年6月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228548

T. R. Gilliland, S. S. Kirby, N. Smith

引用次数: 0

Notes on the Impedance of a Carbon Microphone 碳素麦克风的阻抗说明

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228489

F. Offner

引用次数: 0

High-Efficiency Modulation System 高效调制系统

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228495

R. Dome

引用次数: 4

A Phase-Opposition System of Amplitude Modulation 一种相位对抗的调幅系统

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228496

L.F. Gaudernack

引用次数: 13

A Method of Designing Simulative Networks 一种模拟网络的设计方法

Proceedings of the Institute of Radio Engineers Pub Date : 1938-07-01 DOI: 10.1109/JRPROC.1938.228425

W. A. Edson

{"title":"A Method of Designing Simulative Networks","authors":"W. A. Edson","doi":"10.1109/JRPROC.1938.228425","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228425","url":null,"abstract":"In communication work it is often necessary to design a simple lumped network, the impedance of which approximates at all frequencies that of a certain distributed circuit, such as a transmission line. The present treatment includes a clarified method of making such a design. Former design methods have the common fault that negative circuit constants may be called for. This paper presents a simple method by which the difficulty is avoided. Moreover the best design under the particular circumstances in question may be arrived at quickly and directly. The impedance functions of two common forms of simulative networks are developed and design equations for the establishment of the parameters are presented. Since four elements are to be established it is possible to specify four arbitrary conditions. This is most conveniently handled by specification of the vectorial impedance at two frequencies. The major portion of this paper is concerned with the relation which must exist between these impedances in order that the calculated circuit parameters will all be positive. For the sake of completeness conditions leading to negative parameters are also considered.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"877-891"},"PeriodicalIF":0.0,"publicationDate":"1938-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228425","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Abnormal Ionization in the E Region of the Ionosphere 电离层E区的异常电离

Proceedings of the Institute of Radio Engineers Pub Date : 1938-07-01 DOI: 10.1109/JRPROC.1938.228426

J. Pierce

引用次数: 22

Characteristics of the Ionosphere at Washington, D.C., May, 1938 华盛顿特区电离层的特征，1938年5月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-07-01 DOI: 10.1109/JRPROC.1938.228428

T. R. Gilliland, S. S. Kirby, N. Smith

引用次数: 3

A Direct-Reading Radio-Wave-Reflection-Type Absolute Altimeter for Aeronautics 航空用直读式无线电波反射式绝对高度计

Proceedings of the Institute of Radio Engineers Pub Date : 1938-07-01 DOI: 10.1109/JRPROC.1938.228387

S. Matsuo

引用次数: 2

The Relation between Radio-Transmission Path and Magnetic-Storm Effects 无线电传输路径与磁暴效应的关系

Proceedings of the Institute of Radio Engineers Pub Date : 1938-07-01 DOI: 10.1109/JRPROC.1938.228386

G. W. Kenrick, A. Braaten, J. General

{"title":"The Relation between Radio-Transmission Path and Magnetic-Storm Effects","authors":"G. W. Kenrick, A. Braaten, J. General","doi":"10.1109/JRPROC.1938.228386","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228386","url":null,"abstract":"This paper presents the results of a quantitative study of the relationship between the proximity of great-circle transmission paths to the magnetic pole and of signal stability during terrestrial magnetic disturbances. Reception from Europe as observed at Riverhead, Long Island, and San Juan, Puerto Rico, is compared during normal and disturbed periods. The great-circle path from Europe to San Juan is about 1000 miles farther from the north magnetic pole than a similar path to Riverhead. A brief description of the duplicate equipment and antenna systems employed at the two locations is included. It has been known for some time that the more southerly transmission paths are apparently less susceptible to effects accompanying magnetic disturbances. The results of observations covering a period of years confirm the anticipated relationship between signal stability and proximity of the transmission path to the magnetic pole. The average advantage of San Juan over Riverhead for European signals during disturbed periods is found to be approximately 8 decibels. Evidence of higher ionospheric ionization over the more southerly path is noted in a number of cases by a comparison of nighttime cutoff effects and allied phenomena.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"831-847"},"PeriodicalIF":0.0,"publicationDate":"1938-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1