diff --git a/plugins/channeltx/udpsink/udpsink.cpp b/plugins/channeltx/udpsink/udpsink.cpp
index 6b64f74dd..aae466f8f 100644
--- a/plugins/channeltx/udpsink/udpsink.cpp
+++ b/plugins/channeltx/udpsink/udpsink.cpp
@@ -46,15 +46,20 @@ UDPSink::UDPSink(MessageQueue* uiMessageQueue, UDPSinkGUI* udpSinkGUI, BasebandS
     m_squelchCloseCount(0),
     m_squelchThreshold(4800),
     m_modPhasor(0.0f),
+    m_SSBFilterBufferIndex(0),
     m_settingsMutex(QMutex::Recursive)
 {
     setObjectName("UDPSink");
     m_udpHandler.setFeedbackMessageQueue(&m_inputMessageQueue);
+    m_SSBFilter = new fftfilt(m_config.m_lowCutoff / m_config.m_inputSampleRate, m_config.m_rfBandwidth / m_config.m_inputSampleRate, m_ssbFftLen);
+    m_SSBFilterBuffer = new Complex[m_ssbFftLen>>1]; // filter returns data exactly half of its size
     apply(true);
 }
 
 UDPSink::~UDPSink()
 {
+    delete[] m_SSBFilterBuffer;
+    delete m_SSBFilter;
 }
 
 void UDPSink::start()
@@ -193,6 +198,45 @@ void UDPSink::modulateSample()
             m_modSample.imag(0.0f);
         }
     }
+    else if ((m_running.m_sampleFormat == FormatLSBMono) || (m_running.m_sampleFormat == FormatUSBMono))
+    {
+        FixReal t;
+        Complex c, ci;
+        fftfilt::cmplx *filtered;
+        int n_out = 0;
+
+        m_udpHandler.readSample(t);
+        m_inMovingAverage.feed((t*t)/1073741824.0);
+        m_inMagsq = m_inMovingAverage.average();
+
+        calculateSquelch(m_inMagsq);
+
+        if (m_squelchOpen)
+        {
+            ci.real((t / 32768.0f) * m_running.m_gain);
+            ci.imag(0.0f);
+
+            n_out = m_SSBFilter->runSSB(ci, &filtered, (m_running.m_sampleFormat == FormatUSBMono));
+
+            if (n_out > 0)
+            {
+                memcpy((void *) m_SSBFilterBuffer, (const void *) filtered, n_out*sizeof(Complex));
+                m_SSBFilterBufferIndex = 0;
+            }
+
+            c = m_SSBFilterBuffer[m_SSBFilterBufferIndex];
+            m_modSample.real(m_SSBFilterBuffer[m_SSBFilterBufferIndex].real() * 32768.0f);
+            m_modSample.imag(m_SSBFilterBuffer[m_SSBFilterBufferIndex].imag() * 32768.0f);
+            m_SSBFilterBufferIndex++;
+
+            calculateLevel(m_modSample);
+        }
+        else
+        {
+            m_modSample.real(0.0f);
+            m_modSample.imag(0.0f);
+        }
+    }
     else
     {
         m_modSample.real(0.0f);
@@ -468,6 +512,7 @@ void UDPSink::apply(bool force)
         m_inMovingAverage.resize(m_config.m_inputSampleRate * 0.01, 1e-10); // 10 ms
         m_squelchThreshold = m_config.m_inputSampleRate * m_config.m_squelchGate;
         initSquelch(m_squelchOpen);
+        m_SSBFilter->create_filter(m_config.m_lowCutoff / m_config.m_inputSampleRate, m_config.m_rfBandwidth / m_config.m_inputSampleRate);
         m_settingsMutex.unlock();
     }
 
diff --git a/plugins/channeltx/udpsink/udpsink.h b/plugins/channeltx/udpsink/udpsink.h
index 2814a01b2..5f47f2d09 100644
--- a/plugins/channeltx/udpsink/udpsink.h
+++ b/plugins/channeltx/udpsink/udpsink.h
@@ -24,6 +24,7 @@
 #include "dsp/interpolator.h"
 #include "dsp/movingaverage.h"
 #include "dsp/nco.h"
+#include "dsp/fftfilt.h"
 #include "util/message.h"
 
 #include "udpsinkudphandler.h"
@@ -223,6 +224,7 @@ private:
         Real m_inputSampleRate;
         qint64 m_inputFrequencyOffset;
         Real m_rfBandwidth;
+        Real m_lowCutoff;
         int m_fmDeviation;
         Real m_amModFactor;
         bool m_channelMute;
@@ -241,6 +243,7 @@ private:
             m_inputSampleRate(48000),
             m_inputFrequencyOffset(0),
             m_rfBandwidth(12500),
+            m_lowCutoff(300),
             m_fmDeviation(1.0),
             m_amModFactor(0.95),
             m_channelMute(false),
@@ -292,11 +295,15 @@ private:
     int  m_squelchCloseCount;
     int m_squelchThreshold;
 
-    float m_modPhasor; //!< Phasor for FM modulation
+    float m_modPhasor;    //!< Phasor for FM modulation
+    fftfilt* m_SSBFilter; //!< Complex filter for SSB modulation
+    Complex* m_SSBFilterBuffer;
+    int m_SSBFilterBufferIndex;
 
     QMutex m_settingsMutex;
 
     static const int m_sampleRateAverageItems = 17;
+    static const int m_ssbFftLen = 1024;
 
     void apply(bool force);
     void modulateSample();
diff --git a/plugins/channeltx/udpsink/udpsinkgui.cpp b/plugins/channeltx/udpsink/udpsinkgui.cpp
index 158407db7..00df4b431 100644
--- a/plugins/channeltx/udpsink/udpsinkgui.cpp
+++ b/plugins/channeltx/udpsink/udpsinkgui.cpp
@@ -416,6 +416,7 @@ void UDPSinkGUI::applySettings(bool force)
             force);
 
         ui->applyBtn->setEnabled(false);
+        ui->applyBtn->setStyleSheet("QPushButton { background:rgb(79,79,79); }");
     }
 }
 
@@ -452,36 +453,43 @@ void UDPSinkGUI::on_sampleFormat_currentIndexChanged(int index)
     }
 
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_sampleRate_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_rfBandwidth_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_fmDeviation_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_amModPercent_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_udpAddress_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_udpPort_textEdited(const QString& arg1 __attribute__((unused)))
 {
     ui->applyBtn->setEnabled(true);
+    ui->applyBtn->setStyleSheet("QPushButton { background-color : green; }");
 }
 
 void UDPSinkGUI::on_gain_valueChanged(int value)