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Sylvain Munaut 246tnt at gmail.comHi, >> nanoBTS has both side. You can clearly see them here : >> http://openbsc.osmocom.org/trac/wiki/nanoBTS/Internals >> sysmoBTS I know has RX filters, I don't remember about TX. > > Hum, I don't see how is that different from a duplexer if they have > both Rx and Tx filters. Do you know any particular reason for this > design? It still exposes independent TX and RX lines allowing for external amplification / filtering if required. Also in a duplexer you have a direct electrical connection rather than TX->RX radiation which means you need much more attenuation (often requiring the duplexer + subsequent band pass filters). Cheers, Sylvain