The QLA-50-4000-20-15 from Qualwave is a RF Amplifier with Frequency 0.05 to 4 GHz, Gain 20 dB (Small Signal), Small Signal Gain 20 dB, Gain Flatness ±1.5 dB, Noise Figure 1.5 dB. Tags: Low Noise Amplifier. More details for QLA-50-4000-20-15 can be seen below.