The need of duplexer in low power operation

Sylvain Munaut 246tnt at
Thu Oct 11 11:10:26 UTC 2012


>> nanoBTS has both side. You can clearly see them here :
>> 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).



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