Abstract: The present invention provides a method for isolating and purifying 1,1,1,2,2-pentafluoroethyl iodide or hydrogen fluoride from a mixture of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride, characterized by distilling an azeotropic mixture of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride from a mixture containing 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride either after liquid-liquid separation when the mixture is heterogeneous or directly when the mixture is homogeneous to obtain 1,1,1,2,2-pentafluoroethyl iodide or hydrogen fluoride from the bottom of the distillation column.

Abstract: A communication system includes an interrogator for transmitting an interrogation signal generated on the basis of a communication reference time length. A responder is operative for decoding the interrogation signal from the interrogator at a given reception timing. The interrogator transmits a communication reference signal before a transmission of a communication signal. The communication reference signal represents the communication reference time length. The responder measures the communication reference time length represented by the communication reference signal transmitted from the interrogator. The responder sets the reception timing in accordance with the measured communication reference time length.