Proceedings of the Institute of Radio Engineers最新文献_第9页

A New System of Inductive Tuning 一种新型感应调谐系统

Proceedings of the Institute of Radio Engineers Pub Date : 1938-03-01 DOI: 10.1109/JRPROC.1938.228126

P. Ware

{"title":"A New System of Inductive Tuning","authors":"P. Ware","doi":"10.1109/JRPROC.1938.228126","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228126","url":null,"abstract":"A sliding-contact variable inductance is described wherein contact reliability over long life is secured by a unique carriage arrangement and parallel nibs at the point of contact. The coil is rotatable, the high-potential contact being taken off a ring at one end. The contactor and unused end of the coil are at ground potential. The entire variable coil is used and the high-frequency limit is determined by a separate adjustable \"end\" inductance which improves the performance throughout the high-frequency range. The high-frequency limit of a continuous operating range for a given coil is near the natural frequency of the unused part of the coil when the contact is near the high-potential end of its travel. Wide frequency tuning ratios of the order of six to eight are feasible and all-wave continuous coverage may be effected with two switch positions instead of three as required with variable-condenser tuning. Oscillator circuits are described which yield substantially uniform voltage over a ten-to-one frequency range. This widerange characteristic may be obtained even in the ultra-high-frequency region. Wider ranges necessitate improvement in the tracking of the usual superheterodyne input circuit. A method for producing a fourth tracking crossover when the inductive tuner is designed for superheterodyne circuit tuning is described.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"308-320"},"PeriodicalIF":0.0,"publicationDate":"1938-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62307604","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

Relations Existing between Voltage Impulses of Exponential Form and the Response of an Oscillating Circuit 指数型电压脉冲与振荡电路响应的关系

Proceedings of the Institute of Radio Engineers Pub Date : 1938-03-01 DOI: 10.1109/JRPROC.1938.228189

R. Lambert

引用次数: 0

Characteristics of the Ionosphere at Washington, D.C., January, 1938 华盛顿特区电离层的特征，1938年1月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-03-01 DOI: 10.1109/JRPROC.1938.228190

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

引用次数: 2

Characteristics of the Ionosphere at Washington, D.C., December, 1937 1937年12月，华盛顿特区电离层的特征

Proceedings of the Institute of Radio Engineers Pub Date : 1938-02-01 DOI: 10.1109/JRPROC.1938.228288

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

引用次数: 0

Frequency Discrimination by Inverse Feedback 基于逆反馈的频率识别

Proceedings of the Institute of Radio Engineers Pub Date : 1938-02-01 DOI: 10.1109/JRPROC.1938.228370

G.H. Fritzinger

{"title":"Frequency Discrimination by Inverse Feedback","authors":"G.H. Fritzinger","doi":"10.1109/JRPROC.1938.228370","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228370","url":null,"abstract":"This paper deals with the application of feedback to amplifiers for the sole purpose of obtaining a frequency discrimination in the gain-frequency characteristic of the amplifier. The theory of the feed-back amplifier is given and the general form of the vector envelope μβ representing the over-all propagation factor of the amplifier and feed-back circuit is described for a feed-back amplifier which is to have a predetermined gain-frequency characteristic. A basis of feed-back amplifier design is indicated in which the desired over-all μβ-vector envelope is formed by choosing and synthesizing the propagation factors of the component circuits in the amplifier and feed-back circuits. The analysis of the amplifier and feed-back circuits into component circuits which have either fixed- or variable-frequency propagation factors is indicated. Various common resistance-capacitance circuit configurations useful in feed-back amplifier design are shown and simple graphical means for determining the propagation-factor-vector envelopes for these circuits are illustrated. The allocation of the frequency scale on these vector envelopes is also done by graphical means. Two specific cases in feed-back amplifier design are then illustrated for obtaining respectively a high-pass and low-pass gain-frequency characteristic to resistance-capacitance-coupled amplifiers utilizing only resistive and capacitive elements in the feed-back circuit. The amplifier circuit arrangements, the μβ-vector envelopes, and the gain-frequency characteristics of the feed-back amplifiers are given in these illustrated cases. The analytical proof for the graphical determination of the behavior of the propagation factor for one of the resistance-capacitance circuits illustrated is submitted in the Appendix.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"207-225"},"PeriodicalIF":0.0,"publicationDate":"1938-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228370","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308193","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: 4

Beam Power Tubes 束流功率管

Proceedings of the Institute of Radio Engineers Pub Date : 1938-02-01 DOI: 10.1109/JRPROC.1938.228286

O. Schade

引用次数: 14

A New Type of Selective Circuit and Some Applications 一种新型选择电路及其应用

Proceedings of the Institute of Radio Engineers Pub Date : 1938-02-01 DOI: 10.1109/JRPROC.1938.228287

H. H. Scott

引用次数: 72

Single-Side-Band Telephony Applied to the Radio Link between the Netherlands and the Netherlands East Indies 用于荷兰和荷属东印度群岛之间的无线电链路的单边带电话

Proceedings of the Institute of Radio Engineers Pub Date : 1938-02-01 DOI: 10.1109/JRPROC.1938.228369

N. Koomans

{"title":"Single-Side-Band Telephony Applied to the Radio Link between the Netherlands and the Netherlands East Indies","authors":"N. Koomans","doi":"10.1109/JRPROC.1938.228369","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228369","url":null,"abstract":"An historical introduction reviews the initial long-wave telegraph circuit with the East Indies in 1923, the first short-wave telegraph circuit in 1925, and the inauguration of short-wave telephony in 1928, this being accomplished by means of the usual double-side-band and carrier system. The principal limitations attending this method of operation are discussed; viz., the phenomena of fading, susceptibility to frequency and phase modulation, and the fact that it does not lend itself to multiplexing, because of the presence of the high-powered carrier. The features which characterize the present system are, first, that of single-side-band as applied to high-frequency transmission, and, second, that of multiplexing, whereby a plurality of channels are enabled to be transmitted by means of a single power amplifier and directive antenna system. In the transmitter the group of channels which is to be transmitted, representing one telegraph and two telephone messages, is assembled at low power and low carrier frequency and is then stepped up in power and in frequency in a succession of stages. The spectrum transmitted comprises (1) the two telephone channels located in frequency as single bands on opposite sides of the suppressed carrier; (2) the telegraph channel superimposed thereon as two tone frequencies, one for spacing and one for marking, and transmitted on a double-side-band basis to obtain the advantage of frequency diversity; and (3) the pilot channel transmitted at a frequency 5000 cycles removed from the carrier position.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"182-206"},"PeriodicalIF":0.0,"publicationDate":"1938-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308180","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: 4

Booklets, catalogs and pamphlets received 收到小册子、目录及小册子

Proceedings of the Institute of Radio Engineers Pub Date : 1938-01-01 DOI: 10.1109/jrproc.1936.227370

引用次数: 0

Booklets, catalogs and pamphlets received 收到小册子、目录及小册子

Proceedings of the Institute of Radio Engineers Pub Date : 1938-01-01 DOI: 10.1109/jrproc.1936.228026

引用次数: 0