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Dependences of the microwave absorption on temperature, magnetic field and microwave power obtained for the high-Tr superconductors are presented. Shape of the magnetically modulated microwave absorption, low-field phase diagram and overheating of the Josephson junction system induced by microwave irradiation are discussed. The model of the Josephson junction system interacting with microwaves has been used to explain the behavior of the high-T e superconductors in low magnetic field.