11 Oct
2012
11 Oct
'12
7:01 a.m.
Hi,
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.
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.
Mine actually shipped without antennas :p
I use it with rubber duck in lab tests but I don't know if it's a
recommended configuration.
Cheers,
Sylvain