The S-270 from Stellant Systems is a Diplexer with Frequency f1 1789.8 to 1809.8 MHz(RX), Frequency f2 2233.5 to 2261.5 MHz(TX), Power 20 W, Attenuation 35 to 80 dB, Attenuation f1 35 to 80 dB. Tags: Module with Connectors, Combline. More details for S-270 can be seen below.