| 摘要 |
PURPOSE:To reduce power consumption and to eliminate the need for the consideration of an isolation characteristic of a switch by providing a power supply changeover circuit interrupting the power supply to an antenna other than the antenna selected among plural antenna sections. CONSTITUTION:Suppose that an antenna section 1 receives a broadcast from a satellite A, an antenna section 2 receives a broadcast from a satellite B, and an antenna section 3 receives a broadcast from a satellite C, then when a satellite broadcast is received actually, an operation section 8 designates a channel number and any of the satellites A-C. In this case, a system controller 7 selects interlockingly switches S1-S6 based on any designation data from the satellites A-C designated by the operation section 8. For example, the satellite A is selected, the switches S1, S4 are closed and the other switches are opened. In the case of the satellite B selected, the switches S2, S5 are turned on and in the case of the satellite C selected, the switches S3, S6 are turned on. A PLL data is sent to a 2nd comparator 4 by a channel number. A satellite name and its channel number are displayed on a display section 9. |
