The 5139 from Ophir RF is a RF Amplifier with Frequency 100 to 500 MHz, Gain 57 dB, Gain Flatness ± 2.0 dB, Output Power 55.74 to 57.78 dBm, Output Power 374.97 to 599.79 W. Tags: Benchtop / Rackmount, Power Amplifier. More details for 5139 can be seen below.