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Principles of Electronic Communication Systems provides the most up-to-date survey available for studentstaking a first course in electronic communications. Requiring only basic algebra and trigonometry this newedition is notable for its readability learning features and numerous photos and illustrations. This editioncontains greatly expanded and updated material on the Internet cell phones and wireless technologies.Practical skills like testing and troubleshooting are integrated throughout. A brand-new Laboratory &Activities Manual provides both hands-on experiments and a variety of other activities reflecting the variety ofskills now needed by technicians.