The 5137A from Ophir RF is a RF Amplifier with Frequency 800 MHz to 2 GHz, Gain 61 dB, Gain Flatness ± 2.5 dB max with no ALC, ± 1 dB max with internal leveling, Output Power 56.99 to 59.03 dBm, Output Power 500.03 to 799.83 W. Tags: Power Amplifier. More details for 5137A can be seen below.