| 摘要 |
PROBLEM TO BE SOLVED: To provide a reception equipment which can change the number of external reception antennas without changing the total number of reception antennas by providing a reception antenna in the reception equipment separately from external reception antennas set on a vehicle. SOLUTION: In the tire inflation pressure monitor device consisting of a transmission equipment, reception antennas 6, a reception equipment 10 and a display means 16 which displays tire information, a built-in reception antenna 12 is provided even in the reception equipment 10 separately from external reception antennas 6 installed on the outside of the reception equipment 10, for example, in a tire house. The radio wave transmitted from the transmission equipment can be received by external reception antennas 6 or the incorporated reception antenna 12. |
