A guide to communication electronics for technicians. It is relevant to a number of disciplines and should help the reader prepare for many certification examinations in the electronics industry. The text is divided into three sections - Associate Level, Journeyman Level and Body of Knowledge. The first two sections contain a question-answer-discussion chapter, so that the reader can not only see the correct answer, but also the reasoning behind it. Following that, a practice examination chapter tests the reader's knowledge in a multiple-choice format with answer key. The third section, Body of Knowledge contains articles on topics that all technicians need to know about.