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This research implements a power line communication system that adopts the power line communication (PLC) standard “X10” and the On Off Keying (OOK) modulation technology. The OOK technology can be used to judge the demodulated results and examine the digital signal data. The circuits are divided into transmitter and receiver in the power line communication system. Power line system experiments using a realistic grid system determined the transmission signal distance between the transmitter and receiver can reach to 40~50 meters. In the case where the transmitter and receiver are not connected to the grid system, we compared the output signal with the original signal data. The signal delay time is 8.5 μs in one meter and 12.5 μs in forty nine meters. The output signals vary with the different distances. The experiment shows that the signal declined 11.116 dB in 20 meters and 15.619 dB in 50 meters. The results show that the proposed system is functional using 12 bit digital signals generated by a microprocessor.