VRC-411/E system is a direct sequence spread spectrum radio designed and manufactured for establishing communication in the UHF1 frequency band. Due to the method used in this radio i.e. expanding the frequency spectrum in a wider bandwidth and decreasing power level of transmitter and as a result hiding radio signal under the noise level, the signal is prevented from being monitored by enemy for eavesdropping and jamming. A keypad includes handset is designed for the radio to set the system parameters and establishing voice communication. In addition, parameters of the system can be set via the GUI software. One important capability of the VRC-411/E radio is to network 6 systems as the TDMA for data transmission. In this network, one system is Master and other 5 systems are Slaves, whereas voice is transmitted normally in broadcast mode