diff --git a/common/utils/T/T_messages.txt b/common/utils/T/T_messages.txt
index 1ca8c90e89..dc9080b158 100644
--- a/common/utils/T/T_messages.txt
+++ b/common/utils/T/T_messages.txt
@@ -9,6 +9,11 @@ ID = USRP_RX_ANT0
     GROUP = ALL:HEAVY
     FORMAT = int,timestap : buffer,data
 
+ID = USRP_TX_ANT0
+    DESC = TX IQ data as sent by USRP driver on antenna 0
+    GROUP = ALL:HEAVY
+    FORMAT = int,timestap : buffer,data
+
 #PHY logs
 ID = ENB_PHY_UL_TICK
     DESC = eNodeB uplink tick - one tick per ms at start of uplink processing
diff --git a/radio/USRP/usrp_lib.cpp b/radio/USRP/usrp_lib.cpp
index 71da4da167..1c4efdacf8 100644
--- a/radio/USRP/usrp_lib.cpp
+++ b/radio/USRP/usrp_lib.cpp
@@ -643,6 +643,8 @@ void *trx_usrp_write_thread(void * arg){
       ret = (int)s->tx_stream->send(&(((int16_t *)buff_tx[0])[0]), nsamps, s->tx_md);
     }
 
+    T(T_USRP_TX_ANT0, T_INT(timestamp), T_BUFFER(buff_tx[0], nsamps*4));
+
     if (ret != nsamps) LOG_E(HW,"[xmit] tx samples %d != %d\n",ret,nsamps);
     VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_USRP_SEND_RETURN, ret );
     VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE_THREAD, 0 );