The QPA-4000-5000-42-41.7S from Qualwave is a RF Amplifier with Frequency 4 to 5 GHz, Gain 42 dB, Gain Flatness ±2 dB, Saturated Power 41.7 dBm, Saturated Power 14.79 W. Tags: Power Amplifier. More details for QPA-4000-5000-42-41.7S can be seen below.