diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 273ad62..6ee912d 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -342,7 +342,9 @@ double FGCom::getCurrentCommVolume() const {
     if (_commVolumeNode)
         rv = rv * _commVolumeNode->getFloatValue();
 
-    return rv;
+//zhongjin
+//    return rv;
+    return 1.0;
 }
 double FGCom::getCurrentFrequencyKhz() const {
     return 10 * static_cast<int>(_currentCommFrequency * 100 + 0.25);