Re: [Discuss-gnuradio] Usrp2 synchronize

[zero cool]

Hi all,
after successful integration and complete working usrp, I got following error:
address@hidden:~/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 <module>
    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

On Mon, Feb 1, 2010 at 9:07 PM, Gaetano Mendola <address@hidden> wrote:

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 Mendola

--
cpp-today.blogspot.com


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Thanks.....