Hi Matt,

Thanks for clearing the doubt. I guess reception on USRP2 is weak as
I have not connected any antenna on RX2. I'll try to test with the antenna
to see if things work out or not.


On Sat, Mar 26, 2011 at 9:00 PM, Matt Ettus <matt@ettus.com> wrote:
On 03/26/2011 08:52 PM, abhinav anand wrote:
> Hi Users,
> I am using WBX daughter board on USRP2 for my experiments with *OpenBTS
> UHD*.
> I see my BTS goes *deaf* sometimes and doesn't receive anything from
> cell phones.
> (using GSM 900 band)
> As I found from Wiki, it could possibly be due to WBX board using two
> antennas (TX/RX and RX2)
>                   USRPdevice.cpp (code has this line)
> *                  m_uRx->write_io(1,RX2_RX1N,RX2_RX1N); // using Rx2*
> In my testing, I am using only one antenna at RF1 output and did not
> connect anything at RF2
> output of USRP2 board.
> Is there any different patch available for *OpenBTS UHD* code to make
> use of single WBX antenna
> at TX/RX both for Tx and Rx ??

Impossible.  You can't do full duplex on a single antenna connector with
any of our boards.  You need to use separate antennas or use an external