| 摘要 |
PURPOSE:To avoid the end of call by sending an alarm signal to a mobile station when a weak radio wave from the mobile station continues for a prescribed time so as to generate an alarm display or the like thereby informing the end of call to a person using a portable radio telephone set after a prescribed time. CONSTITUTION:An alarm signal generating circuit 7 outputs an alarm command signal to a control section 4 when a weak electric field detection signal is outputted consecutively for a prescribed time, and an alarm signal is outputted from the control section 4 by this command toward a transmission section 5. As a result, an alarm signal is sent together with a transmission wave from the transmission section 5 via a multicoupler 2 and the antenna 1. When a termination signal generating circuit 8 outputs an end of call command signal toward the control section 4 when the weak electric field detection signal is consecutively outputted by a prescribed time. The end of call signal is sent from the control section 4 toward the transmission section 5 by this signal and the end of call signal is sent toward the mobile station together with the transmission wave. Thus, the end of call is avoided. |
