| 摘要 |
PURPOSE:To confirm a slave station call by a master station, and also, to know the position of a slave station by providing a means for detecting an input level of a receiving signal and setting it onto an answer-back signal, on a portable type slave station, and providing a means for decoding and outputting this information on the master station. CONSTITUTION:A high frequency signal containing a discrimination signal and a message signal from a master station 1 is set onto a transmission part 5 and radiated from an antenna 7. A slave station 2 receives said signal and processes the received signal, and when it is decided that its own station has been called, a sounding part 14 is operated, and also, a message from the master station is displayed on a display part 15. Also, the slave station 2 detects a level of received input by a received input level detecting part 16, and this level is compared with a prescribed value determined in advance, by a comparing part 17. Whether the compared level is large, middle or small is divided, and a control part 13 transmits an answer-back signal containing the detected level information and the discrimination signal from an antenna 9. It is received by the master station 1, the detected level information contained in the answer-back is decided, decoding is executed, and its decoding output is displayed on an output device 10. |
