Abstract: In a linear transmitter (20) for use in combination with a radio communication system of TDMA that has a plurality of radio stations each of which has the linear transmitter, the linear transmitter is supplied with an input signal having a preamble at a first period and an information signal at a second period following the first period. The linear transmitter comprises a switching circuit (21) for supplying a quadrature modulator circuit (14) with the input signal during the first period. The switching circuit supplies the quadrature modulator circuit with a difference signal of a differential amplifier (13) which is supplied with the input signal. A quadrature demodulator (18) quadrature demodulates a transmission signal into a feedback signal having feedback inphase and feedback quadrature components in accordance with a phase adjusted carrier signal which is supplied from a phase adjusting circuit (23).