Tire condition monitoring apparatus transmitter, and receiver

A tire condition monitoring apparatus comprises transmitters (15) and a receiver (16). Each transmitter (15) is provided in a tire (14) and the receiver (16) is provided in a body frame (13) of a vehicle (12). The apparatus further comprises initiators (22) each corresponding to one of the transmitters (15). Based on a trigger signal from the corresponding initiator (22), each transmitter (15) wirelessly transmits a predetermined determination signal, which includes tire information, two or more times in a fixed time period from the transmission circuit. The determination signal from the transmission circuit is received by the reception circuit of the receiver (16) and a controller determines whether there is a match between the received determination signals. When there is a match, the position of the tire is located and the tire information is processed as valid information.