摘要:

The paper deals with certain specific details of design and operation of the high-power valve transmitter installed at Rugby radio station, and is divided into six parts.Part I discusses the arrangement of the coupled aerial circuit of a valve transmitter, and shows that certain circuits have considerable advantages over others in respect of the elimination of harmonics.Part II indicates the considerations which govern the choice of the electrical proportions of the intermediate and aerial circuits, simple formulae being given for the calculation of the different quantities involved.Part III deals with the question of the design of large inductance coils, and compares measured values of the high-frequency resistance of certain coils with the calculated values.Part IV contains some notes on valve-circuit design, compares two conditions of operation of a valve transmitter and gives an analysis of the present operating condition at Rugby. The comparative operation of valves in low- and high-power transmitters is also discussed.Part V gives oscillograms of the shape of signals emitted when using different keying arrangements, and indicates the improvement obtained in certain cases. The transients due to keying are discussed briefly also.Part VI gives the results of recent signal measurements and a schedule of readings under present normal working conditions.

DOI:10.1049/jiee-1.1927.0021

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0023

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0024

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0025

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0026

出版商:IEE    

年代:1927

数据来源: IET

摘要:

It appears to be the practice to state the volume of air displaced per minute by a ceiling fan without any reference to the conditions under which the measurements are made. The tests detailed in this paper were undertaken to determine the influence upon the measured volume of air of:(a) Distance of plane of observation below fan blades.(b) Position of fan in, and size of, room.(c) Height of fan above floor.(d) Distance between fan and ceiling.(e) Room temperature.(f) Speed of fan.Recommendations are made relating to the conditions under which air velocities should be observed.

DOI:10.1049/jiee-1.1927.0027

出版商:IEE    

年代:1927

数据来源: IET

摘要:

The circuit arrangements devised by Boucherot to give a constant-current supply from a constant-voltage supply are briefly described, and it is then shown that they may be regarded as simple examples of a more general property of all electric filters.

DOI:10.1049/jiee-1.1927.0028

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0030

出版商:IEE    

年代:1927

数据来源: IET

DOI:10.1049/jiee-1.1927.0031

出版商:IEE    

年代:1927

数据来源: IET