| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vehicle-mounted machine capable of discriminating a trouble at a vehicle antenna by a simple circuit configuration and not causing any useless consumption of an electrical current. <P>SOLUTION: A vehicle-mounted machine 19 comprises a receiving antenna 10 for receiving a radio wave transmitted from a mobile unit 1, a receiving circuit 11 for recovering electric signals converted at the receiving antenna 10, a control part 12 for discriminating the correct or wrong state of a receiving signal obtained from the receiving circuit 11, a driving circuit 13 driven by a driving signal A of the control part 12 and supplying an antenna current IA to a vehicle antenna 27, and a sensor means 16 for generating a sensing signal to determine whether or not the vehicle antenna 27 normally operates, and the sensor means 16 feeds back a sensing signal B to the control part 12 through the receiving circuit 11. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
