Usrp2 synchronize

GNU Radio
1

Hi all,
we are using two USRP2 devices to build a CDMA communication channel,
at the moment the big issuewe are facing is the error frequency
introduced
coupling two (TX and RX) USRP2 devices.

In order to reduce the frequency error we are using an external 10Mhz
reference and we are planning to use
also a PPS source. Can you suggest any out of shelf device able to
give use both 10MHz and the PPS needed ?

Regards
Gaetano M.

–

2

On 02/01/2010 07:37 AM, Gaetano M. wrote:

Regards
Gaetano M.

Jackson Labs Firefly:

http://jackson-labs.com/

Matt

3

On 02/01/2010 04:39 PM, Matt E. wrote:

give use both 10MHz and the PPS needed ?

Matt

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

There’s also the Trimble Thunderbolt-E (evaluating one of those right
now)
There’s also the Orbital Research GPS DO

4
5

Hi,

From: Matt E. [email protected]

Jackson Labs Firefly:

http://jackson-labs.com/

Matt

Just an idea, if this device is recommended by you, can you offer it
(with cables and other needed staff) as a synchronization tool kit in
Ettus sales so it will be a one stop shop ?

Best regards,

Firas

6

Hi all,
after successful integration and complete working usrp, I got following
error:
sandeep@sandeep-desktop:~/gnuradio/gnuradio-examples/python/usrp$ sudo
./usrp_nbfm_rcv.py
Using RX d’board A: DBS Rx
len(rx_chan_coeffs) = 397

gr_fir_ccc: using SSE
len(audio_taps) = 423

gr_fir_fff: using SSE
audio_alsa_sink[hw:0,0]: unable to support sampling rate 32000
card requested 44100 instead.
audio_alsa_sink[hw:0,0]: set_period_time_near failed: Invalid argument
Traceback (most recent call last):
File “./usrp_nbfm_rcv.py”, line 382, in
app = stdgui2.stdapp (my_top_block, “USRP NBFM RX”)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 36, in init
wx.App.init (self, redirect=False)
File
“/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7978, in init
self._BootstrapApp()
File
“/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7552, in _BootstrapApp
return core.PyApp__BootstrapApp(*args, **kwargs)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 39, in OnInit
frame = stdframe (self.top_block_maker, self.title, self._nstatus)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 60, in init
self.panel = stdpanel (self, self, top_block_maker)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 81, in init
self.top_block = top_block_maker (frame, self, vbox, sys.argv)
File “./usrp_nbfm_rcv.py”, line 73, in init
self.rxpath = receive_path(options.rx_subdev_spec, options.gain,
options.audio_output)
File “./usrp_nbfm_rcv.py”, line 301, in init
audio_sink = audio.sink (int(self.audio_rate), audio_output)
File “/usr/local/lib/python2.6/dist-packages/gnuradio/audio_alsa.py”,
line
299, in sink
return _audio_alsa.sink(*args, **kwargs)
RuntimeError: audio_alsa_sink

I saw same error on discussion board but still unreplied, Kindly please
help
me how can rectify this problem.
your effort is appreciated

7

On 02/01/2010 11:32 PM, Firas A. wrote:

Matt

Just an idea, if this device is recommended by you, can you offer it (with cables and other needed staff) as a synchronization tool kit in Ettus sales so it will be a one stop shop ?

We have considered it. If there is enough demand we could pursue it
further.

Matt

8

On Mon, Feb 08, 2010 at 01:57:16PM +0530, zero cool wrote:

audio_alsa_sink[hw:0,0]: unable to support sampling rate 32000
card requested 44100 instead.
audio_alsa_sink[hw:0,0]: set_period_time_near failed: Invalid argument
Traceback (most recent call last):

http://tinyurl.com/yhd7pes

http://gnuradio.org/redmine/wiki/gnuradio/ReportingErrors

Eric