[Discuss-gnuradio] Synchronize phases between two N200

[Shih Oliver]

Hi, 

      I'm trying to synchronize two N200s in phases with both of them having GPSDO inside. I followed

the instructions on ettus for synchronizing channel phase. However, I got error message as follows, 

UHD source block got error code 0x2

gr_block_executor: source <gr_block gr uhd usrp source (19)> produced no output.  We're marking it DONE.

UHD source block got error code 0x2

gr_block_executor: source <gr_block gr uhd usrp source (18)> produced no output.  We're marking it DONE.

and here's part of my code:

bool start(void){

        #ifdef GR_UHD_USE_STREAM_API

        _rx_stream = _dev->get_rx_stream(_stream_args);

        _samps_per_packet = _rx_stream->get_max_num_samps();

        #endif

        //setup a stream command that starts streaming slightly in the future

        static const double reasonable_delay = 0.5; //order of magnitude over RTT

        uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);

        stream_cmd.num_samps = 200000;

        stream_cmd.stream_now = false;

         stream_cmd.time_spec = uhd::time_spec_t(reasonable_delay);

        _dev->issue_stream_cmd(stream_cmd);

        _tag_now = true;

        return true;

    }

Thanks for any help in advance. 

Best regards, 

Oliver