| 摘要 |
PURPOSE:To obtain a device of a good operativity, by using a pulse, which is generated for channel switching of a TV receiver, to reset the adjustment of a phase shifter inserted between two horizontally stacked antennas. CONSTITUTION:Antennas 1 and 2 are stacked horizontally, and an electronic switch 3 and a variable phase shifter 4 are inserted in the system of the antenna 2 to adjust the ghost signal to a minimum. An input signal A of a pulse generated for channel switching of a TV receiver is given to a reset signal generating circuit 10. A signal B is given to a switch 11 while interlocking with the switch 3. Signals A and B supply a reset signal output I through NAND gates 12-16, a resistance 17, an integral capacitor 18, and an NAND gate 18. The signal I obtained in this manner is reset by channel switching when the switch 3 is turned on; and when the switch 3 is cut off, the signal I is reset by making of the switch after channel switching. |
