A data acquisition unit of a magnetic resonance system has an examination region therein, relative to which an examination subject is conveyed by a patient bed. The data acquisition unit has a built-in radio-frequency transmission arrangement, that radiates radio-frequency energy into the examination subject, and a built-in reception arrangement that receives radio-frequency magnetic resonance signals emitted from the examination subject as a result of excitation by the radiated radio-frequency energy. The reception arrangement operates as a resistive arrangement when the radio-frequency energy is being radiated by the transmission arrangement, and operates as a superconducting arrangement when the magnetic resonance signals are being received thereby.