| 摘要 |
PURPOSE:To connect only a simple measuring meter to a terminal for test to detect the intensity of the electric field of radio waves received in a receiving antenna, by detecting the reception level of radio waves, which are received by an outdoor unit, with an indoor unit and transmitting the detected level to the outdoor unit and providing the outdoor unit with the terminal for test which can output the reception level given from the indoor unit to the external. CONSTITUTION:An output terminal connector 8 is connected to a terminal 13 for test through an RF (high frequency) choke coil 10, a DC stopping capacitor 12, and a rectifying diode 16. The output of a detector 39 is given to a DC amplifier 40 to control the amplitude of the oscillated output of a low frequency oscillator. The output of the low frequency oscillator 41 is given to an input terminal connector 31 through an RF choke coil 42. A DC current and a low frequency signal which are transmitted from an indoor unit 30 to an outdoor unit 2 are superposed on a coaxial cable 20 besides a high frequency signal transmitted from the outdoor unit 2 to the indoor unit 30. |
