| 摘要 |
PURPOSE:To decrease the separated frequency interval between a transmission line frequency and a receiving line frequency, by transmitting a transmission line frequency signal to the linewithout being subject to the self inductance of a three winding transformer itself. CONSTITUTION:A signal in transmission line frequencies 100-150kHz inputted from an input terminal 1 is amplified at a transmission amplifier 2 and transmitted to line from a terminal 101 of a three winding transformer 10 to a terminal 102 through a protector via a transmission/reception band filter 11 taking a receiving line frequency band from a transmission line frequency band, i.e., 100-115kHz. A signal in receiving line frequencies 110-115kHz from an opposing device inputted from a line input and output terminal 5 is transmitted from the terminals 102 and 101 of the transformer 10 to the terminals 104 and 105 after bing filtered at the filter 11, to an output terminal 7. |
