| 摘要 |
PROBLEM TO BE SOLVED: To enable communication in case of emergency, even when an vacant channel is not awilable for continuous transmission by the use of an intermittent transmission type specific wave assigned close to this frequency band when radio emission can not be performed because a continuously transmissible specific frequency radio wave for telemeter and telecontrol is occupied by other radio equipment, etc. SOLUTION: A master unit of this radio remote controller is provided with a master unit control part 13, including a intermittent wave controlling part and a remote control input device 19 to control the part 13. The master unit performs carrier sensing, determines the presence or absence of a carrier and sends it to the part 13, including the intermittent wave control part at the time of sending a high frequency signal with a superimposition of a command signal from the device 19 on radio waves of anyone frequency from among forty waves that are allowed to be continuously sent between ch. Nos. 7 to 46. When all of these forty waves are determined as having carriers, they are switched to six waves that are supposed to be sent intermittently, and an vacant channel is searched for. |
