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Minimum-acceptable ratios of RF carrier to interference at the input terminals of receiving equipment, commonly called protection ratios, are dependent upon a multitude of parameters. For a given type of radio service, primary considerations are the quality of service demanded, receiver characteristics, propagation conditions, the nature of the interference, and the frequency separation between desired and undesired signals. Representative values used are scattered throughout CCIR and other literature. Cochannel values are gathered together in this paper for convenient reference.