Patent ID: 6091939
Filing Date: 2000-07-18
Classification: H03D,H04B

Abstract:
A transmitter for communicating with a remote mobile radio directly to the mobile radio at a talk-around frequency range or through a common base station at a normal frequency range, comprising:a switch to select one of the talk-around or normal frequency ranges;a modulator to input a desired signal, modulate the desired signal, and output the modulated desired signal as an intermediate signal;a first transmission path, communicating with the modulator through the switch, to input the intermediate signal and to output the intermediate signal at the normal frequency range to the mobile radio, when the switch selects the normal frequency range;a second transmission path, independent of the first transmission path, communicating with the modulator through the switch, to input the intermediate signal, modulate the intermediate signal to the talk-around frequency range, and output the intermediate signal at the talk-around frequency range to the common base station, when the switch selects the talk-around frequency range;a transmission antenna to receive the intermediate signal at said one of the talk-around or normal frequency ranges from a corresponding one of the first or second transmission paths, and to transmit the received intermediate signal to a corresponding one of said base station and mobile radio.