| 摘要 |
PURPOSE:To direct the directivity of a reception atenna toward the maximum reception level at all times, by detecting the direction of maximum reception level with the 2nd synthesis antenna output and switching the 1st synthesis antenna output to the direction. CONSTITUTION:An output of branching filters 35, 36 connected to antennas 32, 33 having 8-shaped directional antenna intersecting orthogonally with each other is selected and switched by a switching device 37, synthesized with a synthesizer 43 with an output of a branching device 34 connected to an antenna without directivity and switched to positive or negaive phase with a phase inverter 39, and the result is inputted to a television receiver 45. Further, the output of the branching devices 35, 36 is synthesized with the output of the branching filter 34 at a synthesizer 44 via a switching device 38 and phase inverter 40, and the reception level is detected at an antenna direction controller 48. The controller 48 sequentially switches a directional switching controller 42 at a prescribed time to detect the direction of maximum reception level, and control is done to match the direction of directivity of a directional switching controller 41 in matching with the detection. |
