| 摘要 |
PROBLEM TO BE SOLVED: To simply receive lots of broadcast programs in the community reception of horizontally/vertically polarized waves in satellite broadcast. SOLUTION: In the case of receiving the horizontally polarized wave, a voltage DC 15 V for a horizontal converter received from a tuner is dropped into a voltage DC 5 V by series connection of lots of diodes 4 by utilizing the voltage drop characteristic of the diode 4 and the voltage DC 5 V is used to activate a relay 3. On the other hand, in the case of receiving the vertically polarized wave, a voltage DC 11V for a vertical converter received from the tuner is dropped similarly to the above by using the diodes 4 to inactivate the relay 3. Then the horizontal/vertical power supply for the converters fed from the tuner is applied to wires 1, 2 through a coaxial cable indoor to operate the relay 3.
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