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เนื้อหาย่อ : Most books are written because the author, who may have been, or is a teacher, has found that he is not satisfied with existing material on the subiect at a particular level --- this is true of Basic Radio. Many fine texts have been written on radio engineering. However, books on radio communications for the student or beginner have fallen short in thct they either fail to communicate to the reader by being too mathematicai or too technical, or they attempt to oversimplify the subiect and thus "'water down' the technical material to a point where there is little foundation left on which the student can build his future knowledge of radio. During his many years of teaching experience, the author found the great communicative value in the visualized approach to teaching radio. As an instructor, the author had first-hand knowledge of the benefits and drawbacks of a wide variety of teaching methods. This six-volume course on Basic Radio represents the final development of the author's notes and illustrations in the teaching of the subject of radio. An idea is illustrated on every page of text. Each illustration drives home a com- plete idea, wiih many callouts to enable the reader to get maximum instructive benefit from each illustration. Basic Radio represents the finest develop:nent of instructive material for the teaching of radio in book form. It is truly a radio course palatable to the student.