| 摘要 |
PURPOSE:To simplify the constitution of a reproduction repeater station and reduce the costs of the repeater stations by executing repeating to transmit the radio wave at a received intermediate frequency band as it is when the radio transmission is executed in a 4PSK system. CONSTITUTION:An IF signal distributer 2 distributes IF signals 21 received by a receiving device 1 to an MQAM modulator-demodulator 3 and an IF signal switching device 4. A switching controller 6 receives a control signal 281 sent from a reception terminal 30, when the control signal 281 is indicated to select the MQAM system, the IF signal switching device 4 makes an IF signal 31 outputted to transmission equipment 5 by a control signal 6. When the control signal 281 is indicated to select the 4PSK system, the IF signal switch 4 makes an IF signal 21 outputted to the transmission equipment 5. Thus, by providing the inexpensive IF distributer and the IF switch without providing the 4PSK system modulator-demodulator as the reproduction repeater station, the costs of the repeater station and the system can be reduced. |
