The L54144 from Mercury Systems is a Diplexer with Frequency f1 1.563 to 1.587 GHz, Frequency f2 1.215 to 1.239 GHz, Power 1 W, Peak Power 330 to 450 W, Attenuation 25 to 45 dB. Tags: Module with Connectors, Cavity. More details for L54144 can be seen below.