| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a communication system which does not require of an expensive coaxial cable as a control line for connecting an antenna part and main body part for the on-vehicle radio equipment on a half-duplex communication system, where neither parts are connected. SOLUTION: In the on-vehicle radio equipment for performing data communication related to a toll with roadside radio equipment 8, an antenna part 1 where an antenna 2 for communication and a data transmitting/receiving part 3 are integrated and a main body part 4 are separated, and both the parts are connected by a control signal line 7 where three signal lines for transmission, reception and power supply are collected into one. Thus, since no expensive coaxial cable or connector is required and an amplifier is not required for correcting power attenuated by the coaxial cable, the component cost can be reduced.</p> |
