摘要:

The paper develops a method for estimating the total intermodulation noise power falling into any channel in the transmission band of an a.m. multi-channel line system with many repeater sections in tandem. These sections may be composed of widely varying lengths of cable imperfectly equalized by non-identical amplifiers whose in-band feedback, output load impedance and output network response all vary with frequency. The whole system is loaded in such a way that the signal levels at each intermodulation source are also functions of frequency.After developing the basic theory, methods are given for estimating the system performance before building an amplifier and also when a model amplifier is available. These methods are more general than those previously published and are illustrated by examples.

DOI:10.1049/pi-c.1960.0052

出版商:IEE    

年代:1960

数据来源: IET

摘要:

In the study of eddy-current distribution in solid cores subjected to a pulsating or rotating magnetic field a general 2-dimensional current distribution exists and is created by a magnetizing winding that restricts the current flow through it in only one direction. Under such situations, the method of evaluation of the equivalent impedance of the system as a whole is difficult to visualize and has not so far been attempted in the literature. Such an evaluation calls for a concept of the power factor of the magnetizing winding. This is the special feature of the paper.The paper further examines the usefulness of this concept for the evaluation of eddy-current loss in solid cores and thus offers an alternative method.To give more validity to several of the formulae deduced in the paper, the analysis is applied to compute the performance characteristics of a solid-rotor induction machine and certain conclusions are drawn.

DOI:10.1049/pi-c.1960.0053

出版商:IEE    

年代:1960

数据来源: IET

摘要:

Radiation from an axial magnetic line or slot source on the surface of a corrugated cylinder is considered. It is indicated that the power radiated in a given mode for the structure depends critically on the surface reactance and the circumference of the cylinder. In fact, for certain values of these parameters, particular modes are strongly excited and contain most of the radiated power. Numerical results are presented for several interesting cases.The analysis is extended to an elliptic cylinder whose surface also possesses an inductive reactance. In order to facilitate the solution it is necessary to assume a special azimuthal variation of the surface reactance. For the model as chosen, strong resonance characteristics are again obtained. This model may be adapted to study the problem of a corrugated panel on a flat metallic ground plane which is excited by a parallel slot source.

DOI:10.1049/pi-c.1960.0054

出版商:IEE    

年代:1960

数据来源: IET

DOI:10.1049/pi-c.1960.0056

出版商:IEE    

年代:1960

数据来源: IET