The RMP300/400/57HK-A from G-WAY Microwave is a RF Amplifier with Frequency 100 to 500 MHz, Gain 57 dB, Gain Flatness ±2 dB, Output Power 57 dBm, Output Power 501.19 W. Tags: Benchtop / Rackmount, Power Amplifier, Automatic Gain Controlled Amplifier. More details for RMP300/400/57HK-A can be seen below.