diff --git a/include-gpl/dsp/interpolator.h b/include-gpl/dsp/interpolator.h
index 1965f0e57..26a423f2c 100644
--- a/include-gpl/dsp/interpolator.h
+++ b/include-gpl/dsp/interpolator.h
@@ -51,6 +51,8 @@ private:
 
 	void doInterpolate(int phase, Complex* result)
 	{
+		if (phase < 0)
+			phase = 0;
 #if 1
 		// beware of the ringbuffer
 		if(m_ptr == 0) {
diff --git a/plugins/channel/tcpsrc/tcpsrcgui.cpp b/plugins/channel/tcpsrc/tcpsrcgui.cpp
index 3b16a08c4..214a2a178 100644
--- a/plugins/channel/tcpsrc/tcpsrcgui.cpp
+++ b/plugins/channel/tcpsrc/tcpsrcgui.cpp
@@ -27,8 +27,8 @@ void TCPSrcGUI::setName(const QString& name)
 void TCPSrcGUI::resetToDefaults()
 {
 	ui->sampleFormat->setCurrentIndex(0);
-	ui->sampleRate->setText("25000");
-	ui->rfBandwidth->setText("20000");
+	ui->sampleRate->setText("48000");
+	ui->rfBandwidth->setText("40000");
 	ui->tcpPort->setText("9999");
 	ui->spectrumGUI->resetToDefaults();
 	applySettings();
@@ -78,9 +78,9 @@ bool TCPSrcGUI::deserialize(const QByteArray& data)
 				ui->sampleFormat->setCurrentIndex(0);
 				break;
 		}
-		d.readReal(4, &realtmp, 25000);
+		d.readReal(4, &realtmp, 48000);
 		ui->sampleRate->setText(QString("%1").arg(realtmp, 0));
-		d.readReal(5, &realtmp, 20000);
+		d.readReal(5, &realtmp, 40000);
 		ui->rfBandwidth->setText(QString("%1").arg(realtmp, 0));
 		d.readS32(6, &s32tmp, 9999);
 		ui->tcpPort->setText(QString("%1").arg(s32tmp));
@@ -141,7 +141,7 @@ TCPSrcGUI::TCPSrcGUI(PluginAPI* pluginAPI, QWidget* parent) :
 	m_spectrumVis->configure(m_threadedSampleSink->getMessageQueue(), 64, 10, FFTWindow::BlackmanHarris);
 
 	m_channelMarker = new ChannelMarker(this);
-	m_channelMarker->setBandwidth(25000);
+	m_channelMarker->setBandwidth(40000);
 	m_channelMarker->setCenterFrequency(0);
 	m_channelMarker->setVisible(true);
 	connect(m_channelMarker, SIGNAL(changed()), this, SLOT(channelMarkerChanged()));
@@ -170,7 +170,7 @@ void TCPSrcGUI::applySettings()
 
 	Real outputSampleRate = ui->sampleRate->text().toDouble(&ok);
 	if((!ok) || (outputSampleRate < 100))
-		outputSampleRate = 25000;
+		outputSampleRate = 48000;
 	Real rfBandwidth = ui->rfBandwidth->text().toDouble(&ok);
 	if((!ok) || (rfBandwidth > outputSampleRate))
 		rfBandwidth = outputSampleRate;
diff --git a/plugins/channel/tcpsrc/tcpsrcgui.ui b/plugins/channel/tcpsrc/tcpsrcgui.ui
index 72d2ea622..9e9952d90 100644
--- a/plugins/channel/tcpsrc/tcpsrcgui.ui
+++ b/plugins/channel/tcpsrc/tcpsrcgui.ui
@@ -56,7 +56,7 @@
     <item row="3" column="1">
      <widget class="QLineEdit" name="rfBandwidth">
       <property name="text">
-       <string>20000</string>
+       <string>40000</string>
       </property>
      </widget>
     </item>
@@ -77,7 +77,7 @@
     <item row="1" column="1">
      <widget class="QLineEdit" name="sampleRate">
       <property name="text">
-       <string>25000</string>
+       <string>48000</string>
       </property>
      </widget>
     </item>