The S-311 from Stellant Systems is a Triplexer with Frequency 1819.75 to 2270.25 MHz, Frequency Band 1 1819.75 to 1820.25 MHz, Frequency Band 2 2225 to 2235 MHz, Frequency Band 3 2269.75 to 2270.25 MHz, Insertion Loss Band 1 0.45 to 0.5 dB. Tags: Combline. More details for S-311 can be seen below.