| 摘要 |
PURPOSE:To improve the transmission efficiency and to prevent collision at transmission state by adopting the system that the subcarrier of a transmission signal is connected during irradiation of radio wave and the transmission is started when the subcarrier is cut off at the reception side. CONSTITUTION:The transmission signal outputted from a data transmitter 1 of the master station is inputted to a data transmitter 4 via a radio equipment 2 of the master station and a radio equipment 3 of a slave station. When the transmission from the master station is finished, the transmission is started to the data transmitter 4 of the slave station. When a transmission section 5 of the data transmitter 1 outputs a transmission signal 18 subjected to FS modulation to a radio transmitter 7 and a radio transmission start signal 19 at the same time, the transmission signal is inputted to a radio transmitter 10 of the radio equipment 3 from the radio transmitter 7 via a transmission line 17, reaches a reception section 12 of the data transmitter 4 as a reception signal 21 and then is demodulated. When the subcarrier of the reception signal 21 is cut off, a subcarrier detection circuit 14 outputs a radio wave irradiation stopping signal 24 to the transmission section 6. The transmission section 6 starts transmission to the master station via the transmitter 8. |
