| 摘要 |
PROBLEM TO BE SOLVED: To simplify and use in common make use of circuits after an intermediate frequency stage by fixing a received intermediate frequency and a transmission intermediate frequency respectively. SOLUTION: Local oscillation signals are generated by a receiver side first local oscillator, provided with a first voltage controlled oscillator 15 and a first phase-locked loop 16, by a transmitter side first local oscillator provided with a second voltage controlled oscillator 35 and a phase-locked loop, and by a local oscillation frequency mixer 4 to mix outputs of the receiver side first local oscillator and of the transmitter side first local oscillator. In the case of receiving a signal on a plurality of communication frequency bands, any one of the local oscillation signals is selected and the received radio signal is converted into one intermediate frequency, and the transmission intermediate frequency signal is converted into a radio signal or a transmission signal. |
