| 摘要 |
PROBLEM TO BE SOLVED: To use one set in two sets of antennas for protection radios to be mounted on a train by a simple antenna mounted in a train driver's cab in a train protection radio relay system. SOLUTION: When the protection radio in the simple antenna 203d side mounted in the train driver's cab issues a protection signal, the protection radio 202c itself receives the protection issue signal 204a from the antenna mounted on an opposite-side train roof of the same train and at the same time performs the protection relay action, the protection radio 202c transmits the protection issue signal 204b and sets protection radios in the other trains present on the same line in a prescribed area into a protection signal having received state. |
