These errors probably mean you are running the 64 MHz version of the OpenBTS transceiver, since it does not support these commands.

If you *are* running OpenBTS on a stock 64 MHz USRP clock, congratulations.  It often doesn't work at all, but sometimes you get lucky.

What kind of operating range do you get with the singe WBX board and with what antenna arrangement?  Any idea of the level of tx/rx isolation?

On Nov 30, 2010, at 1:44 PM, hanwen wrote:

Hi, *,

The OpenBTS works with my USRP2+1 WBX works pretty fine. Actually, this is the first time in my life that I successfully made a call with OpenBTS. As I don't have RFX900/1800 boards, I tried to make it work with USRP1+WBX before but failed.

THANKS to Thomas and other guys contribute to this UHD-supported OpenBTS!

I still got the ALARMS when starting OpenBTS:
1291152553.1603 ALARM 3073911008 TRXManager.cpp:447:setMaxDelay: SETMAXDLY failed with status -1
1291152553.1605 ALARM 3073911008 TRXManager.cpp:458:setRxGain: SETRXGAIN failed with status -1

And when I tried to use rxgain command to set RX gain, I still get this:
1291153403.5711 ALARM 3074988256 TRXManager.cpp:458:setRxGain: SETRXGAIN failed with status -1
new RX gain is 0 dB

Any clue for this problem?

Cheers,
Hanwen



2010/11/17 Thomas Tsou <ttsou@vt.edu>
I'm announcing the availability of USRP2 support with OpenBTS. The
patch set consists of a new device implementation that uses the UHD
driver from Ettus Research and allows the use of an external 10MHz
reference clock. Additional implementation details can be found in the
comments and commit log.

Download:

git clone git://github.com/ttsou/openbts-uhd.git

git clone http://github.com/ttsou/openbts-uhd.git

http://github.com/ttsou/openbts-uhd/tarball/master

GitHub:

http://github.com/ttsou/openbts-uhd

Build:

USRP2 support requires the UHD driver and firmware. GNU Radio is not required.

http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki

./bootstrap
./configure --with-uhd
make

Without the '--with-uhd' option, the standard USRP1 implementation
will be built.

Release Notes:

*The USRP2 is clocked at 100MHz and does not output fractional sample
rates, so only the non-52M Transceiver is available.

*Tested with a single WBX board, which is capable of operation on all
4 GSM bands. Other boards should work, but are untested.

*Operation in the upper bands (1800, 1900MHz) requires an external
reference for reliable operation. This is true to a lesser extent in
the lower bands as well.

External Reference Clock:

The front panel 10MHz reference input of the USRP2 can be used to
improve stability of the internal oscillator (~20 ppm). To test
frequency offset, a modified version of Kalibrate -
http://thre.at/kalibrate - is available. Information and examples for
the UHD development branch can be found here.

http://ttsou.github.com/kalibrate-uhd

That's about it. Hopefully, a number of people will find this useful.
Let me know if you have any questions. Comments and feedback are
always welcome.

 Thomas

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David A. Burgess
Kestrel Signal Processing, Inc.