This study aims to design the building of data communication system through radio device media. Data communication in question is communication between two computers. Models of communication by utilizing computers that are currently rarely used are very possible to be used in areas that have not been served by telecommunication networks. The weakness of low speed, only 1200 bps up to 9600bps so that data can be sent only to the file letters, photos of small capacity. This system is well suited to accommodate village data or integrated puskesmas data with sub district or district office office. From the result of research, the result of the research shows that the design of data communication system through radio has been successfully built using a TCM 3105 IC based modem with data transmission speed modem 2298 bps at 0.4 bps / Hz bandwidth error with AX.25 protocol. FM radio modulation communication media works on radio working frequency 27.0250 Mhz, 5.6 Watt output power. The transmitter range was tested at a distance of 2 km is still good at - 82 dBm. Benefits that can be expected from the research later is the availability of data communication systems in areas that have not been reached by the service or cellular network especially for the needs of village offices and puskesmas are integrated.