This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/UmTRX@lists.osmocom.org/.
Alexander Chemeris alexander.chemeris at gmail.comOn Thu, Oct 11, 2012 at 9:58 AM, Sylvain Munaut <246tnt at gmail.com> wrote: > Hi, > >> IIRC, both nanoBTS and SysmoBTS have separate antennas for Rx andTx and do >> not use duplexers. Do we need duplexer for UmTRXv2 if it operates in the low >> power mode, without an additional PA/LNA? > > Note that both still have internal filters. You mean bandpass filters? Are they only on Rx side or both Tx and Rx? > Antenna design also plays a role. The nanoBTS uses patch antenna > separated by a lump of metal to minimize direct radiation from TX to > RX. Yes, I remember that nanoBTS has patch antennas for better isolation. But IIRC sysmoBTS has rubber duck antennas which made me wonder how do they do Tx/Rx isolation. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru