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Power line communication modem for appliances control/monitoring network was developed. In order to realize robust communication by reducing influence from noise and channel distortion, the power line communication modem employs dispersed-tone technology and utilizes high frequency band for data transmission. Dispersed-tone technology gives the modem compatibility with radio communication as well as immunity from noise and channel distortion of power line. Performance of communication was measured. And compatibility with radio communication was also assessed. The results showed that the power line communication modem proposed in this paper was well qualified as a communication device for the purpose, and was compatible with radio communication.