Proceedings of the Institute of Radio Engineers最新文献_第4页

Characteristics of the Ionosphere at Washington, D.C., September, 1938 华盛顿特区电离层的特征，1938年9月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-11-01 DOI: 10.1109/JRPROC.1938.228829

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

引用次数: 0

Practical Application of an Ultra-High-Frequency Radio-Relay Circuit 超高频无线电中继电路的实际应用

Proceedings of the Institute of Radio Engineers Pub Date : 1938-11-01 DOI: 10.1109/JRPROC.1938.228742

J.E. Smith, F.H. Kroger, R. George

引用次数: 3

On the Long-Period Variations in the F2Region of the Ionosphere 关于电离层f2区的长周期变化

Proceedings of the Institute of Radio Engineers Pub Date : 1938-11-01 DOI: 10.1109/JRPROC.1938.228783

Keikitiro Tani, Y. Ito, H. Sinkawa

{"title":"On the Long-Period Variations in the F2Region of the Ionosphere","authors":"Keikitiro Tani, Y. Ito, H. Sinkawa","doi":"10.1109/JRPROC.1938.228783","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228783","url":null,"abstract":"The long-period variations in the F2region are discussed with data based on observations of the ionosphere for the last 42 months since May, 1934, by the Naval Technical Research Department, Tokyo. The variations in the critical frequency of the penetration are presented in the form of monthly averages of the noon values. The mtean values of the hourly critical frequencies of the penetration for a month were calculated in order to measure the approximate value of the energy absorbed by the F2region. It is shown that these mean values change with the zenith angle of the sun, and they seem to have similar characteristics in both hemispheres. The rate of the seasonal variation in these values, moreover, is much greater in the southern hemisphere than in the northern hemisphere. From this it is presumed that there are two kinds of variations in the energy absorbed by the F2region, the one seasonal and the other annual, the effect of these variations being differential in the northern hemisphere and additional in the southern hemisphere. The anomalous variation in the critical frequency of the F2region may be explained by this presumption with the aid of the hypothesis of thermal expansion. A graph of the seasonal variations in the minimum virtual height is given, in which it is shown that this variation seems to prove the foregoing presumptions.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"76 1","pages":"1340-1346"},"PeriodicalIF":0.0,"publicationDate":"1938-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308272","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

Characteristics of the Ionosphere at Washington, D.C., August, 1938 华盛顿特区电离层的特征，1938年8月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-10-01 DOI: 10.1109/JRPROC.1938.228727

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

引用次数: 0

The Bridge-Stabilized Oscillator 桥稳定振荡器

Proceedings of the Institute of Radio Engineers Pub Date : 1938-10-01 DOI: 10.1109/JRPROC.1938.228725

L. A. Meacham

引用次数: 54

Transients of Resistance-Terminated Dissipative Low-Pass and High-Pass Electric Wave Filters 电阻端端耗散低通和高通滤波器的瞬态

Proceedings of the Institute of Radio Engineers Pub Date : 1938-10-01 DOI: 10.1109/JRPROC.1938.228724

W. Chu, Chung-Kwei Chang

{"title":"Transients of Resistance-Terminated Dissipative Low-Pass and High-Pass Electric Wave Filters","authors":"W. Chu, Chung-Kwei Chang","doi":"10.1109/JRPROC.1938.228724","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228724","url":null,"abstract":"Formulas are derived for the solution of the transient receiving-end currents of resistance-terminated dissipative T- and π-type low-pass and high-pass electric wave filters. Oscillograms taken with a cathode-ray oscillograph for direct- and alternating-current cases are found to agree with the results calculated from these formulas. From these calculations the following conclusions are derived: (1) When the terminating resistance is gradually increased from zero, the damping constants of the damped sine terms begin to differ greatly from each other, ranging in decreasing amplitudes from the first damped sine term to the last term of (approximately) cutoff frequency. Hence, the transient is ultimately of the cutoff frequency. At the last frequency, this constant is greater than the corresponding constant (approximately equal to R/2L), when the termination is absent. (2) For each increase of one section, there is introduced an additional damped sine term with a smaller damping constant. Therefore transients die out faster in filters of a small number of sections. (3) The last resonant frequency of the filters varies with the number of sections used. It approaches the cutoff frequency as the number of sections is increased. This paper deals with the receiving-end transient currents of resistance-terminated dissipative low-pass and high-pass electric wave filters of T- and π-types. Transients of nondissipative electric wave filters were first treated by John R. Carson and Otto J. Zobel, who considered primarily an infinite succession of similar T sections and obtained formulas for the current at any section. In 1935, E. Weber and M. J.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"1266-1277"},"PeriodicalIF":0.0,"publicationDate":"1938-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228724","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308500","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

Asymmetric-Side-Band Broadcasting Asymmetric-Side-Band广播

Proceedings of the Institute of Radio Engineers Pub Date : 1938-09-01 DOI: 10.1109/JRPROC.1938.228561

P. P. Eckersley

{"title":"Asymmetric-Side-Band Broadcasting","authors":"P. P. Eckersley","doi":"10.1109/JRPROC.1938.228561","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228561","url":null,"abstract":"An economy in the frequency-channel width occupied by stations sending telephony signals can be made by removing one sideband from the transmitted spectrum. This operation however produces a distortion of the received signals which can only be minimized by an intensification of the carrier component compared with the side-band component. If this intensification is performed at the transmitter the carrier power must be enormously increased and the scheme would be impracticably uneconomic; it is furthermore impossible in broadcast technology to make the necessary alterations to intensify the carrier component in existing receivers all at once because they are publicly owned and extremely numerous. The distortion produced in the absence of carrier-wave intensification at either transmitter or receiver is mainly directly proportional to modulation. The modulation demanded in the transmission of ordinary speech and music is much less at the higher frequencies of modulation than that taking place in the lower middle frequencies. In order, therefore, to approach the ideal of the carrier- and single-side-band system, circuits have been devised to produce what is called an asymmetric side-band transmission in which only the outer parts of the side band are cut away.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"1041-1092"},"PeriodicalIF":0.0,"publicationDate":"1938-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228561","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308615","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: 3

Characteristics of the Ionosphere at Washington, D.C., July, 1938 华盛顿特区电离层的特征，1938年7月

Proceedings of the Institute of Radio Engineers Pub Date : 1938-09-01 DOI: 10.1109/JRPROC.1938.228563

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

引用次数: 0

A Contribution to Tube and Amplifier Theory 对电子管和放大器理论的贡献

Proceedings of the Institute of Radio Engineers Pub Date : 1938-09-01 DOI: 10.1109/JRPROC.1938.228562

W. E. Benham

{"title":"A Contribution to Tube and Amplifier Theory","authors":"W. E. Benham","doi":"10.1109/JRPROC.1938.228562","DOIUrl":"https://doi.org/10.1109/JRPROC.1938.228562","url":null,"abstract":"A formula adapting Maxwell's solution for a plane grating to the plane triode differs from those obtained by previous workers. The triode is simulated by a diode whose electrode separation exceeds the cathode-grid clearance by an amount which is calculated from electrostatic considerations. Corresponding results are derived for the cylindrical triode by means of conformal representation, and are shown to agree better with experiment than the formulas of King and of van der Bijl. The nonuniformity of the electric field due to the presence of the grid, \"grating effect,\" is not marked at the cathode surface, as generally supposed, the field at the cathode being sensibly uniform along the length of the cathode even for grids for which the distance between wires is equal to the cathode-grid clearance. This result is obtained directly from Maxwell's treatise. As the electrons approach the grid the nonuniformity then becomes important and the space-current stream is subject to electron optical considerations. These cause the known departures of gmfrom theory in openmesh tubes. The effects of space charge on the measured amplification factor are briefly discussed. It is shown that μ is two stages removed from the Maxwell shielding constant μ0. The importance of the cathode-plate capacitance is mentioned and an expression given for its approximate value under operating conditions.","PeriodicalId":54574,"journal":{"name":"Proceedings of the Institute of Radio Engineers","volume":"26 1","pages":"1093-1170"},"PeriodicalIF":0.0,"publicationDate":"1938-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JRPROC.1938.228562","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62308628","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: 14

A Unique Method of Modulation for High-Fidelity Television Transmitters 一种独特的高保真电视发射机调制方法

Proceedings of the Institute of Radio Engineers Pub Date : 1938-08-01 DOI: 10.1109/JRPROC.1938.228493

W. N. Parker

引用次数: 4