This book originated as notes used in teaching communications at a technical college in Sydney, Australia. At that time, textbooks written at this level were not available. As demand for this course grew, an Australian text was published. Soon afterward, this text, aimed primarily at American students, was published in the United States.

The text is designed for communications students at the advanced level, and it presents information about the basic philosophies, processes, circuits, and other building blocks of communications systems. It is intended for use as text material, but for greatest effect it should be backed up by demonstrations and practical work in which students participate directly.

In this edition of the text, chapter objectives have been added and student exercises increased in number to reinforce the theory in each chapter. Further, a new chapter on fiber optic theory has been added.

The mathematical prerequisites are an understanding of the formulas of the product-of-two-sines form, very basic differentiation and integration, and binary arithmetic.

The basic electrical-electronic prerequisite is a knowledge of some circuit the- ory and common active circuits. This involves familiarity with de and ac circuit theory, including resonance, filters, mutually coupled circuits and transformers, and the operation of common solid-state devices. Some knowledge of thermionic devices and electron ballistics is helpful in the understanding of microwave tubes. Finally, communication prerequisites are restricted to a working knowledge of tuned voltage and power amplifiers, oscillators, flop-flops, and gates.

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