The 400A400B from AR RF/Microwave Instrumentation is a RF Amplifier with Frequency 10 kHz to 400 MHz, Gain 56 dB, Gain Flatness ±3 dB, Output Power 53.01 to 55.44 dBm, Output Power 199.99 to 349.95 W. Tags: Power Amplifier. More details for 400A400B can be seen below.