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เนื้อหาย่อ : " Radio Electronies" and "'Electronic Engineering" have been written as companion volumes, though written as independent textbooks. Together they represent a revision and extension of the author's "Elec- tron-tube Circuits.'' It has been necessary to include a certain amount of material that is common to both books in order to ensure completeness and continuity of text material. Moreover, the common material is the same in each book, in the interests of economy of production.However, the amount of duplicated material has been kept to a minimum, con- sistent with the desire to have these books independent, and also to provide a complete and continuous development. While one of the main objectives of this book, as its title would indicate, is a study of the important electronie aspects of radio, a much broader scope is contemplated. That is, more than just an analysis of the ele- ments of radio systems is undertaken. For this reason general system block diagrams are discussed before any analysis is undertaken. Many of the important aspects of communication-systems engineering are also discussed in order to bring into focus some of the major factors that must be considered in system synthesis. This accounts for the inclusion of such topics as noise, signal/noise ratios, gain-bandwidth products, and an introduction to information theory, with consideration of the rate of transmission of information. Some of the systems discussed super- ficially require specialized techniques in their operation, and a discussion of these is deemed to be outside of the scope of this book. Therefore only very limited discussion will be found of pulse-modulation systems. Wherever possible, the analysis proceeds in two stages. An effort is made first to present an explanation of the operation of the circuits from a physical point of view. This is followed by fairly rigorous mathe- matical analyses. Such mathematical analyses have a threefold objec- tive: (1) To illustrate the techniques of analysis. Often, in fact, alter- native developments have been included to demonstrate different methods of analysis. (2) To deduce a solution which yields a description of the operation of the circuit. (3) To examine the effects of the various parameters on the operation of the circuit. In all analyses considerable care has been taken to include the requisite reference conditions for potential polarities, current directions, and