Radio telephone having improved modulation characteristics for data transmission

摘要

A radio telephone system of the multi-channel access type using an empty channel selected from a plurality of channels for radio telephone communication of voice audio or data signals and a method of controlling such a radio telephone system. The method and apparatus can improve the data communication quality without reducing the number of available channels. A switching circuit is provided in at least one of the base unit and the radio telephone for changing the frequency characteristic of the signal to be transmitted when the signal is a data signal.