| 摘要 |
PURPOSE:To simplify and miniaturize a portable mobile radio set by detecting that a receiving electric field input has operated consecutively for a time at a predetermined level or over, and deciding the detected result as a start and call end signal to an exchange. CONSTITUTION:An antenna 9 of the portable radio telephone set 101 is kept to a position possible for close coupling with a wired waveguide 17 of a radio base station device 102, and the set 101 operates a transmission start section 7, and transmits a radio wave f1 from the antenna 9 from a known circuit. The base station device 102 receives this radio wave at the wired waveguide 17 and inputs it to a demodulation section 13. A receiving electric field detecting section 18 detects that there exists a prescribed value or over of the input of the demodulation section 13, transmits a control signal to an automatic exchange to allow a radio channel during calling to detect and to transmit a call tone. A receiving electric field detecting section 18 of the base station device 102 that the received electric field is intermitted for a prescribed time or over at the end of talking, and a call end signal is transmitted to the exchange. |
