| 摘要 |
PURPOSE:To provide a security radio system which is capable of preventing the interference between systems and performing a smooth communication even when plural systems are introduced. CONSTITUTION:A radio channel where communication traffic amount is least is selected based on the information for the prescribed period of the use status of each reception channel obtained by deciding whether each reception channel is used in other systems or not, while periodically performing an operation changing the reception channels of the radio line between a master radio equipment 5 and a slave radio equipment 6 successively all over the reception ranges, this selected radio channel is set as the radio channel of a main system, and a communication is performed between the master radio equipment 5 and the slave radio equipment 6 by using this radio channel. |
