Abstract
Radio equipment for railway operation use apply dedicated frequency allocated by Ministry of Internal Affairs and Communications, and severe management is required. It is located as important radio just as police radio and fire radio because a serious damage is assumed on the train scheduling when the railway radio is abused when loss or theft occurred. Therefore we developed a "secure radio system" for the purpose of preventing the abuse by a third person after a radio handset has lost or stolen. This system achieves the purpose with operation permitted time by giving a radio handset constant operation permission time. The radio handset counts down in operation permission time, and, in the radio handset which passed in operation permission time, communication function is locked automatically. The radio handset set for operation prohibition in a management terminal can prevent the abuse of the radio terminal without being able to extend the operation permission time with the radio control unit. These two secure functions of "countdown of the operation permission time" and "setting of operation prohibition" prevent the abuse of the radio handset.
