The RPA was optimize-designed for TETRA, one of digital radio systems, as a device that amplifies the signal to be transmitted from the antenna of a base station to reach radios. It was suitably developed for a base station that was applied with digital modulation in the basis of ample ouput power margin, high gain, wide dynamic range and excellent linearity. With good performance, because high quality components, cutting process housing, EMI/RFI filter, High advanced matiching technology was applied, the deivce has stable reliablity and high efficiency. Rugged structure device was designed to protect from over input and output and to supply stable ripple free output power while muti-channel operation. +28VDC, 350~470Mhz(20Mhz, 4 Band) and 850~870Mhz at 33~46dBM(MAX 40W) are available.