The 6539 from Ophir RF is a RF Amplifier with Frequency 18 to 26.5 GHz, Gain 35 dB, Noise Figure 35 dB, Output Power 51.76 dBm, Output Power 150 W. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier. More details for 6539 can be seen below.