diff --git a/FM.cpp b/FM.cpp
index a165fab..cfd7ba6 100644
--- a/FM.cpp
+++ b/FM.cpp
@@ -412,7 +412,8 @@ void CFM::kerchunkRFState(bool validSignal)
     m_callsignTimer.stop();
     m_statusTimer.stop();
 
-    serial.writeFMEOT();
+    if(m_extEnabled)
+      serial.writeFMEOT();
   }
 }
 
@@ -426,7 +427,8 @@ void CFM::relayingRFState(bool validSignal)
       m_timeoutTimer.stop();
       m_timeoutTone.start();
 
-      serial.writeFMEOT();
+      if(m_extEnabled)
+        serial.writeFMEOT();
     }
   } else {
     DEBUG1("State to RELAYING_WAIT_RF");
@@ -578,7 +580,8 @@ void CFM::hangState(bool validRFSignal, bool validExtSignal)
       m_hangTimer.stop();
       m_statusTimer.stop();
 
-      serial.writeFMEOT();
+      if(m_extEnabled)
+        serial.writeFMEOT();
 
       if (m_callsignAtEnd)
         sendCallsign();