TRANSMITTER-RECEIVER USING DISTRIBUTION LINE

PURPOSE:To reduce required power for a signal voltage source at transmission and to attain transmission reception with high efficiency by setting a drive impedance of a transmitter side and an input impedance of a receive side respectively to a prescribed value. CONSTITUTION:When a signal voltage is applied from a signal voltage source E of a transmitter 4 to a common ground wire 2 in multi-point grounding, a drive impedance ZS of a transmission section 5 is decided equal to a line characteristic impedance ZL to supply a same signal power to the line even when the required power in the signal voltage source E is set to nearly a half that of a conventional system. Thus, when the required power in the signal voltage source E is kept the same, the signal attenuation in a receiver 6 is remarkably reduced more than that in the conventional system. Moreover, the method is applicable even to the case that plural transmitters 4 and receivers 6 are employed.