diff --git a/gr-uhd/lib/gr_uhd_usrp_sink.cc b/gr-uhd/lib/gr_uhd_usrp_sink.cc
index b8b99a4..0e2319d 100644
--- a/gr-uhd/lib/gr_uhd_usrp_sink.cc
+++ b/gr-uhd/lib/gr_uhd_usrp_sink.cc
@@ -22,6 +22,7 @@
 #include <gr_uhd_usrp_sink.h>
 #include <gr_io_signature.h>
 #include <stdexcept>
+#include <iostream>
 
 /***********************************************************************
  * UHD Multi USRP Sink
@@ -170,15 +171,18 @@ public:
         gr_vector_const_void_star &input_items,
         gr_vector_void_star &output_items
     ){
+        std::cout << "gr_uhd_usrp_sink::work() " << noutput_items << std::endl;
         //send a mid-burst packet with time spec
         _metadata.start_of_burst = false;
         _metadata.end_of_burst = false;
         _metadata.has_time_spec = _has_time_spec;
 
+        std::cout << "time before send() " << uhd::time_spec_t::get_system_time().get_real_secs() << std::endl;
         size_t num_sent = _dev->get_device()->send(
             input_items, noutput_items, _metadata,
             _type, uhd::device::SEND_MODE_FULL_BUFF, 1.0
         );
+        std::cout << "time after send() " << uhd::time_spec_t::get_system_time().get_real_secs() << std::endl;
 
         //increment the timespec by the number of samples sent
         _metadata.time_spec += uhd::time_spec_t(0, num_sent, _sample_rate);