This thesis presented signaling duo binary through power line AC 220 Volt, the power line size of 2x1.5 mm2 and 2x2.5 mm2. Field programmable gate array (FPGA) is used to generate a duobinary signal. The coupling circuit signal in receiving – transmitting duo binary into system AC 220 volt and this coupling circuit has a coefficient of transmission S-parameter. Considering the frequency 100 kHz S11 = -14.304 dB
S22 = -13.368 dB S21 = -0.3.3016 dB S12 = -3.0738 dB and frequency 50.1 MHz S11
= -20.046 dB S22 = -17.980 dB S21 = -0.9486 dB S12 = -0.9486 dB. The coupling circuits used in signal reception. Considering the frequency 100 kHz S11 = -15.692 dB S22
= -14.373 dB S21 = -3.0975 dB S12 = -3.1132 dB and frequency 50.1 MHz S11 = -19.084 dB S22 = -15.573 dB S21 = -0.9606 dB S12 = 0.9606 dB. For experimental signaling duo binary through receiving - transmission coupling circuit. Can send a actually signal, when considering the signal through power line length 1 meters and 5 meters. Using a transmission speed of 8 megabits per second.