diff --git a/python/tmc_classes.py b/python/tmc_classes.py
index 1b1ef11..ce95280 100644
--- a/python/tmc_classes.py
+++ b/python/tmc_classes.py
@@ -613,7 +613,7 @@ class tmc_dict:
                     return False
         return True        
     def add(self,message):
-        message_is_repeat=False
+        print_message=True
         self.dict_lock.acquire()
         try:
             lcn=message.location.lcn
@@ -623,17 +623,18 @@ class tmc_dict:
             if message.event.is_cancellation:
                 try:
                     self.messages[lcn][updateClass].cancellation_time=message.getTime()#cancellation_time = rx time of cancellation message
+                    print_message=False#dont print cancellation messages
                 except KeyError:#no message to cancel
                     message.event.name="no message to cancel"
                     self.messages[lcn][updateClass]=message
             else:
                 if  self.messages[lcn].has_key(updateClass) and self.messages[lcn][updateClass].tmc_hash ==message.tmc_hash:#if same message -> add confirmation
                     self.messages[lcn][updateClass].add_confirmation(message)
-                    message_is_repeat=True
+                    print_message=False#dont print repeats
                 else:#(over)write message
                     self.messages[lcn][updateClass]=message
             #print("added message: "+str(message))
-            if not message_is_repeat:
+            if print_message:
               self.list_lock.acquire()
               self.message_list.append(message)
               self.list_lock.release()
@@ -641,7 +642,7 @@ class tmc_dict:
             print("ERROR, not adding: "+str(message))
         finally:
             self.dict_lock.release()
-        return message_is_repeat
+        return print_message
     def getLogString(self,showInvalid,filters):
         self.list_lock.acquire()
         retStr=""
diff --git a/python/tmc_parser.py b/python/tmc_parser.py
index da90022..c934e39 100644
--- a/python/tmc_parser.py
+++ b/python/tmc_parser.py
@@ -176,18 +176,19 @@ class tmc_parser(gr.sync_block):
                 if tmc_F==1:#single group
                     tmc_msg=tmc_message(PI,psn,ltn,tmc_x,tmc_y,tmc_z,datetime_received,self)
                     self.dataLock.acquire(1)
-                    self.tmc_messages.add(tmc_msg)
+                    print_message=self.tmc_messages.add(tmc_msg)
                     self.dataLock.release(1)
-                    self.print_tmc_msg(tmc_msg)
+                    if print_message:#ignore duplicates
+                        self.print_tmc_msg(tmc_msg)
                 elif tmc_F==0 and Y15==1:#1st group of multigroup
                     ci=int(tmc_x&0x7)
                     tmc_msg=tmc_message(PI,psn,ltn,tmc_x,tmc_y,tmc_z,datetime_received,self)
                     self.dataLock.acquire(1)
-                    message_is_repeat=self.tmc_messages.add(tmc_msg)
+                    print_message=self.tmc_messages.add(tmc_msg)
                     self.dataLock.release(1)
                     #if  self.RDS_data[PI]["internals"]["unfinished_TMC"].has_key(ci):
                         #print("overwriting parital message")
-                    if not message_is_repeat:#save unfinished message only once (dont overwrite collected additional groups)
+                    if print_message:#save unfinished message only once (dont overwrite collected additional groups)
                         self.unfinished_messages[PI][ci]={"msg":tmc_msg,"time":time.time()}
                 else:
                     ci=int(tmc_x&0x7)