Hi dapodun nudopad - Yes there are a variety of possible ways the Tx/Rx can result in the "Parser returned #f" issue. What it means is that the S&C detected a header, but the header CRCs (computed versus embedded) didn't match up. Since we can't see your whole flowgraph, its a little difficult to give you more than generalities that I'm sure you've found in your internet searches. Hence, can you attach your full GRC flowgraph for us to test & see what's going on? One doesn't require a specific USRP (or any USRP) to do such testing ... - MLD On Wed, Oct 17, 2018, at 7:38 AM, dapodun nudopad via USRP-users wrote:> Hi, > I am trying to use usrp N210 in a system running ubuntu16.04 for rx- > ofdm in gnuradio while using TX/RX antenna but i get the following > error below.> linux; GNU C++ version 5.4.0 20160609; Boost_105800; > UHD_003.010.001.HEAD-0- > g929e3b32> > -- Opening a USRP2/N-Series device... > -- Current recv frame size: 1472 bytes > -- Current send frame size: 1472 bytes > -- Detecting internal GPSDO.... No GPSDO found > > UHD Warning: > Unable to set the thread priority. Performance may be negatively > affected.> Please see the general application notes in the manual for > instructions.> EnvironmentError: OSError: error in > pthread_setschedparam > Press Enter to quit: INFO: Detected an invalid packet at item 0 > INFO: Parser returned #f > INFO: Detected an invalid packet at item 48 > INFO: Parser returned #f > INFO: Detected an invalid packet at item 96 > INFO: Parser returned #f > INFO: Detected an invalid packet at item 144 > INFO: Parser returned #f > I have read many possibilities on how to fix this error but all came > to not solving this. the flow graph is attached hereby. Could anyone > Please suggest anything i can do so i can transmit and receive using > two different systems running on ubuntu16.04> > _________________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > Email had 1 attachment:
> * Screenshot from 2018-10-17 19-35-59.png 83k (image/png)
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