| 摘要 |
PURPOSE:To control a low impedance equipment by providing an impedance buffer connected between a power line and an equipment to be controlled in a transmission/reception equipment so as to increase the input/output impedance of the transmission/reception equipment with simple constitution. CONSTITUTION:An impedance upper 24 is connected in series between the power line 1 and the equipment 3 to be controlled and the impedance upper 24 is built in the transmission/reception equipment 2. Even when the equipment 3 to be controlled has a low impedance, the impedance of the power line 1 is not lowered by the impedance upper 24, neither the transmission output of a transmission/reception equipment 21 is lowered nor the reception sensitivity level is decreased. Even when an equipment with a low impedance is connected to the transmission/reception equipment, the line impedance is not lowered and stable communication is attained.
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