The BK-21N from Microlab is a Diplexer with Frequency f1 80 MHz to 2.17 GHz, Frequency f2 2.4 to 2.5 GHz, Power 8 to 150 W, Peak Power 3 kW, Insertion loss 0.3 to 0.6 dB. Tags: Module with Connectors, Cavity. More details for BK-21N can be seen below.