diff --git a/projects/VC90/FlightGear/FlightGear.vcproj b/projects/VC90/FlightGear/FlightGear.vcproj
index 364454c1b..fd2548b0a 100644
--- a/projects/VC90/FlightGear/FlightGear.vcproj
+++ b/projects/VC90/FlightGear/FlightGear.vcproj
@@ -3198,6 +3198,30 @@
 				>
 			</File>
 		</Filter>
+		<Filter
+			Name="Lib_Radio"
+			>
+			<File
+				RelativePath="..\..\..\src\Radio\antenna.cxx"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\src\Radio\antenna.hxx"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\src\Radio\radio.cxx"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\src\Radio\radio.hxx"
+				>
+			</File>
+			<File
+				RelativePath="..\..\..\src\Radio\itm.cpp"
+				>
+			</File>
+		</Filter>
 		<Filter
 			Name="Lib_Scenery"
 			>
diff --git a/src/Instrumentation/kr_87.cxx b/src/Instrumentation/kr_87.cxx
index 0fa58012e..8ea39569c 100644
--- a/src/Instrumentation/kr_87.cxx
+++ b/src/Instrumentation/kr_87.cxx
@@ -524,7 +524,9 @@ void FGKR_87::search() {
 	    xyz = adf->cart();
 
 	    if ( _sgr->exists( "adf-ident" ) ) {
-		_sgr->remove( "adf-ident" );
+	        // stop is required! -- remove alone wouldn't stop immediately
+	        _sgr->stop( "adf-ident" );
+	        _sgr->remove( "adf-ident" );
 	    }
 	    SGSoundSample *sound;
         sound = FGMorse::instance()->make_ident( trans_ident, FGMorse::LO_FREQUENCY );
diff --git a/src/Radio/itm.cpp b/src/Radio/itm.cpp
index 28f7004b4..bf42ee2e8 100644
--- a/src/Radio/itm.cpp
+++ b/src/Radio/itm.cpp
@@ -1000,7 +1000,7 @@ double avar(double zzt, double zzl, double zzc, prop_type &prop, propv_type &pro
 			kdv = propv.mdvar;
 			no_situation_variability = kdv >= 20;
 			if (no_situation_variability)
-				no_situation_variability -= 20;
+				kdv -= 20;
 
 			no_location_variability = kdv >= 10;
 			if (no_location_variability)
diff --git a/src/Radio/radio.cxx b/src/Radio/radio.cxx
index efb5baf53..fba504746 100644
--- a/src/Radio/radio.cxx
+++ b/src/Radio/radio.cxx
@@ -362,9 +362,11 @@ double FGRadioTransmission::ITM_calculate_attenuation(SGGeod pos, double freq, i
 
 	_elevations.push_front(point_distance);
 	_elevations.push_front(num_points -1);
+
 	int size = _elevations.size();
 	double *itm_elev;
 	itm_elev = new double[size];
+
 	for(int i=0;i<size;i++) {
 		itm_elev[i]=_elevations[i];
 		
@@ -924,7 +926,7 @@ double FGRadioTransmission::watt_to_dbm(double power_watt) {
 }
 
 double FGRadioTransmission::dbm_to_watt(double dbm) {
-	return exp( (dbm-30) * log(10) / 10);	// returns Watts
+	return exp( (dbm-30) * log(10.0) / 10.0);	// returns Watts
 }
 
 double FGRadioTransmission::dbm_to_microvolt(double dbm) {
diff --git a/src/Sound/audioident.cxx b/src/Sound/audioident.cxx
index 782526c9b..829ce9ab6 100644
--- a/src/Sound/audioident.cxx
+++ b/src/Sound/audioident.cxx
@@ -70,7 +70,15 @@ void AudioIdent::setVolumeNorm( double volumeNorm )
 
 void AudioIdent::setIdent( const std::string & ident, double volumeNorm )
 {
-    if( _ident == ident ) {
+    // Signal may flicker very frequently (due to our realistic newnavradio...).
+    // Avoid recreating identical sound samples all the time, instead turn off
+    // volume when signal is lost, and save the most recent sample.
+    if (ident.empty())
+        volumeNorm = 0;
+
+    if(( _ident == ident )||
+       (volumeNorm == 0))  // don't bother with sounds when volume is OFF anyway...
+    {
         if( false == _ident.empty() )
             setVolumeNorm( volumeNorm );
         return;
@@ -88,6 +96,7 @@ void AudioIdent::setIdent( const std::string & ident, double volumeNorm )
             sound->set_volume( volumeNorm );
             if (!_sgr->add( sound, _fx_name )) {
                 SG_LOG(SG_SOUND, SG_WARN, "Failed to add sound '" << _fx_name << "' for ident '" << ident << "'" );
+                delete sound;
                 return;
             }