In this paper, we proposed the DS-SS modem-based communication system for long distance wireless-transmission. The module we designed in this approach contained both convolution encoder and gold-code generator, which aimed at error correcting, T-DES encryption algorithm and spread-spectrum as well. It embodied PC-based GUI program in order to control the such command signal as data transceiver. This program also used to control the specific FPGA/MCU which is able to verify and interface to the modem. We demonstrated the communication system to verify its proper operation by using GUI program and designed hardware. A set of experiments are conducted and as a result, proposed communication system is well operated as the design specification.