The QPA-3500-4500-43-43S from Qualwave is a RF Amplifier with Frequency 3.5 to 4.5 GHz, Gain 43 dB, Gain Flatness 3±1 dB, Saturated Power 43 dBm, Saturated Power 19.95 W. Tags: Power Amplifier. More details for QPA-3500-4500-43-43S can be seen below.