PURPOSE: To easily receive different information of each area, by transmitting the same carrier frequency from an antenna after the frequency is divided into plural narrow areas and the divided ones are modulated by different signals, and moving one set of receiver while the receiver receives the transmitted information.
CONSTITUTION: Carriers of the same frequency are transmitted to a limited narrow area from antennas 5, 9... of plural carrier oscillating circuits 2, 6... by controlling a synchronization signal generating circuit 1. Each carrier oscillating circuit 2, 6,... modulates 3 and 7 by means of the signal of devices 4 and 8 which respectively send out different signals. When one set of receiver turned to the transmitted carrier is moved while the receiver receives the carrier, different information of each narrow area can easily be received successively. Where radio waves from two antennas overlap, the phase of the radio waves are made opposite to each other so as to narrow the interference area. When the transmission antenna is installed along a road, transmission of traffic information becomes easier.
TANAKA YOSHINORI
UKITA HIROYUKI
OCHIAI YUTAKA
