| 摘要 |
PURPOSE:To set very easily and surely the installing angle of an offset parabolic antenna device by providing a member placed in parallel with the incoming direction of a radio wave to a consituting member constituting the offset parabolic antenna device. CONSTITUTION:The constituting member of the offset parabolic antenna device is provided with the member 23 placed in parallel with the incoming direction of a radio wave. Since the member placed in parallel with the direction, the antenna has only to be set to a prescribed position angle of a broadcast satellite known in advance by taking the member as a reference and the installing angle of the parabolic antenna device is set very easily and surely. Further, in setting a rough installing angle by visual observation, it can also be attained easily by taking the member placed in parallel with the incoming direction of the radio wave as the reference. |
