The FMA-123-1A from Metropole Products Inc. is a Diplexer with Frequency f1 243 to 270 MHz / 360 to 380 MHz, Frequency f2 290 to 322 MHz, Power 250 W, Attenuation 30 to 100 dB, Attenuation f1 30 to 100 dB. Tags: Module with Connectors, Cavity. More details for FMA-123-1A can be seen below.