The L54122 from Mercury Systems is a GPS/GNSS Filter Amplifier with Frequency 1.5654 to 1.5854 GHz, Noise Figure 5.8 dB, Attenuation/Rejection 48 dBc, Current 0.05 A, Gain 21 to 29 dB. Tags: Module with Connector. More details for L54122 can be seen below.