The QPA40-3.4-3.9-44 from Qualink Microwave is a RF Amplifier with Frequency 3.4 to 3.9 GHz, Gain 40 dB, Gain Flatness ±1 dB, Output Power 42 to 44 dBm, Output Power 15.85 to 25.12 W. Tags: Power Amplifier. More details for QPA40-3.4-3.9-44 can be seen below.