Hi, 
      I'm trying to synchronize two N200s in phases with both of them having 
GPSDO inside. I followedthe instructions on ettus for synchronizing channel 
phase. However, I got error message as follows, 
UHD source block got error code 0x2gr_block_executor: source <gr_block gr uhd 
usrp source (19)> produced no output.  We're marking it DONE.UHD source block 
got error code 0x2gr_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                                    
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