diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 58dff51..5d3d535 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -639,13 +639,14 @@ void FGCom::valueChanged(SGPropertyNode *prop)
   if (prop == _ptt_node && _enabled) {
       if (_ptt_node->getIntValue()) {
           // ensure that we are on the right channel by calling setupCommFrequency  
+          fgSetString("/sim/screen/red","PTT按下，请讲...");
+
           setupCommFrequency();
           iaxc_output_level_set(0.0);
           iaxc_input_level_set(_micLevel_node->getFloatValue()); //0.0 = min , 1.0 = max
           _mpTransmitFrequencyNode->setValue(_currentCallFrequency * 1000000);
           _mpTransmitPowerNode->setValue(1.0);
 
-          fgSetString("/sim/screen/white","PTT按下，请讲...");
 
 
           SGPath soundpath( globals->get_fg_root() );