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Ron Hranac, Brady Volpe and John Downey discuss RF fundamentals. The discussion starts with basic building blocks of the sine wave and evolves to how QAM (quadrature amplitude modulation) signals are comprised of sine waves with varying amplitude and phase shifts, which means even though we call them digital signals, they are actual analog signals carrying digital data. This is a great show for anyone in the cable industry or interested in learning more about basic RF.