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Re: [Discuss-gnuradio] TVRX2 and GRC

From: Jeff Long
Subject: Re: [Discuss-gnuradio] TVRX2 and GRC
Date: Fri, 03 Oct 2014 19:49:18 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.1


If you execute the various "sudo sysctl ..." lines shown in the warnings, does it work any better? You can make these permanent.

  man sysctl.conf

- Jeff

On 10/03/2014 05:23 PM, Daniel Marlow wrote:

     We have a new TVRX2, which we are using with a N200 USRP.   The
N200 has a GPSDO.

     The system seems to work fine when we test it with uhd_fft.
  However, we are having trouble figuring out the correct configuration
settings in for a custom GRC flow graph.    The graph in question is
simple, consisting of just the USRP and an FFT GUI, as shown in the
first attached screen shot.

      As the second attached screen shot shows, however, the system does
not run properly, producing a string of "DDDDD's", with the FFT window
going dark.   The warning that reads "Sensor 'lo_locked' failed to lock
within timeout on channel 0" seems like it might be related.

      The 3rd and 4th screen shots show the setup menus for the USRP and
the FFT GUI.

      Any advice on what might be going wrong would be greatly appreciated.

Dan Marlow

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