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Quadrature amplitude modulation (QAM) is increasingly gaining in importance in modern communication and transmission systems, offering, as it does, particularly high spectrum effi-ciency
and reliability in digital data transmission. This applies to wired and wireless links alike. TV Test Receiver EFA from Rohde & Schwarz, the test reference for analog and digital TV signals, analyzes and displays even arbitrary QAM signals with high precision without special synchronization sequences.
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