| 摘要 |
PURPOSE:To prevent the repeating of communication obtaining the effect of space diversity through a couple of parabolic antennas, by controlling the directivity of parabolic antennas by the detection output of the strength of a received radio wave. CONSTITUTION:A radio wave transmitted from transmitter-receiver 11 of station A via palabolic antenna 14 is received by transmitter-receiver 11' via palabolic antenna 14' of station B. Then, detector 12' monitors the variation in received- radio wave strength and when the variation amount exceeds a set allowable value, detector 12 detect a control signal from detector 12' through transmitter-receiver 11', antennas 14' and 14, and transmitter-reveiver 11, and its output control signal drives change-over unit 13 to change over a plural number of feeding units 15, so that the variation due to the radio-wave path will be corrected. |
