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Alexander Chemeris alexander.chemeris at gmail.comOn Thu, Oct 11, 2012 at 3:01 PM, Sylvain Munaut <246tnt at gmail.com> wrote: >> You mean bandpass filters? Are they only on Rx side or both Tx and Rx? > > Yes, bandpass filters. (SAW or Ceramic, possibly both) > > 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? -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru