The DR 400 from Prana is a RF Amplifier with Frequency 10 KHz to 400 MHz, Gain 54 dB, Gain Flatness ±2.5 dB, Output Power 51.76 to 54.77 dBm, Output Power 149.97 to 299.92 W. Tags: Benchtop / Rackmount, Power Amplifier. More details for DR 400 can be seen below.