diff --git a/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.cpp b/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.cpp
index 9bf154a..80b9db3 100644
--- a/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.cpp
@@ -1,17 +1,28 @@
 #include "ssa3000xdriver.h"
 
 #include "CustomWidgets/informationbox.h"
+#include "Util/util.h"
 
 #include <QTcpSocket>
+#include <QDateTime>
 
 SSA3000XDriver::SSA3000XDriver()
 {
+    diffGen = new TraceDifferenceGenerator<SpectrumPoint, 10>([=](const SpectrumPoint &p){
+        SAMeasurement m;
+        m.pointNum = p.index;
+        m.frequency = p.frequency;
+        m.measurements["PORT1"] = pow(10.0, p.dBm / 20.0);
+        emit SAmeasurementReceived(m);
+    });
     searchAddresses.push_back(QHostAddress("192.168.22.2"));
+    connect(&traceTimer, &QTimer::timeout, this, &SSA3000XDriver::extractTracePoints);
+    traceTimer.setSingleShot(true);
 }
 
 SSA3000XDriver::~SSA3000XDriver()
 {
-
+    delete diffGen;
 }
 
 std::set<QString> SSA3000XDriver::GetAvailableDevices()
@@ -81,6 +92,8 @@ bool SSA3000XDriver::connectTo(QString serial)
         return false;
     }
 
+    connect(&dataSocket, qOverload<QAbstractSocket::SocketError>(&QTcpSocket::error), this, &SSA3000XDriver::ConnectionLost, Qt::QueuedConnection);
+
     // grab model information
     dataSocket.write("*IDN?\r\n");
     dataSocket.waitForReadyRead(100);
@@ -188,6 +201,9 @@ bool SSA3000XDriver::setSA(const DeviceDriver::SASettings &s, std::function<void
     if(!connected) {
         return false;
     }
+    startFreq = s.freqStart;
+    stopFreq = s.freqStop;
+
     write(":FREQ:STAR "+QString::number(s.freqStart));
     write(":FREQ:STOP "+QString::number(s.freqStop));
     write(":BWID "+QString::number(s.RBW));
@@ -235,12 +251,17 @@ bool SSA3000XDriver::setSA(const DeviceDriver::SASettings &s, std::function<void
     write(":OUTP:STAT " + (s.trackingGenerator ? QString("ON") : QString("OFF")));
     write(":SOUR:POW "+QString::number((int) s.trackingPower));
 
+    traceTimer.start(100);
+    if(cb) {
+        cb(true);
+    }
+
     return true;
 }
 
 unsigned int SSA3000XDriver::getSApoints()
 {
-    return 0;
+    return 751;
 }
 
 QStringList SSA3000XDriver::availableSGPorts()
@@ -269,6 +290,7 @@ bool SSA3000XDriver::setIdle(std::function<void (bool)> cb)
     if(!connected) {
         return false;
     }
+    traceTimer.stop();
     write("*RST\r\n");
     if(cb) {
         cb(true);
@@ -293,4 +315,42 @@ bool SSA3000XDriver::setExtRef(QString option_in, QString option_out)
 void SSA3000XDriver::write(QString s)
 {
     dataSocket.write(QString(s + "\r\n").toLocal8Bit());
+    dataSocket.readAll();
 }
+
+void SSA3000XDriver::extractTracePoints()
+{
+    if(!connected) {
+        return;
+    }
+    write(":TRAC? 1");
+    auto start = QDateTime::currentDateTimeUtc();
+    while(!dataSocket.canReadLine()) {
+        dataSocket.waitForReadyRead(100);
+        if(start.msecsTo(QDateTime::currentDateTimeUtc()) >= 100) {
+            // timed out
+            qWarning() << "Timed out waiting for trace data response";
+            return;
+        }
+    }
+    QString line = QString(dataSocket.readLine());
+    QStringList values = line.split(",");
+    // line contains a trailing comma, remove last item
+    values.pop_back();
+    std::vector<SpectrumPoint> trace;
+    for(unsigned int i=0;i<values.size();i++) {
+        SpectrumPoint p;
+        p.index = i;
+        p.frequency = Util::Scale((double) i, (double) 0, (double) values.size() - 1, startFreq, stopFreq);
+        bool ok = false;
+        p.dBm = values[i].toDouble(&ok);
+        if(!ok) {
+            // parsing failed, abort
+            return;
+        }
+        trace.push_back(p);
+    }
+    diffGen->newTrace(trace);
+    traceTimer.start(100);
+}
+
diff --git a/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.h b/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.h
index 4c07214..895a247 100644
--- a/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.h
+++ b/Software/PC_Application/LibreVNA-GUI/Device/SSA3000X/ssa3000xdriver.h
@@ -3,8 +3,11 @@
 
 #include "../devicedriver.h"
 
+#include "../tracedifferencegenerator.h"
+
 #include <QHostAddress>
 #include <QTcpSocket>
+#include <QTimer>
 
 class SSA3000XDriver : public DeviceDriver
 {
@@ -139,6 +142,8 @@ public:
      */
     virtual bool setExtRef(QString option_in, QString option_out) override;
 
+private slots:
+    void extractTracePoints();
 private:
     void write(QString s);
     QString serial;
@@ -147,6 +152,21 @@ private:
     bool connected;
     Info info;
 
+    double startFreq, stopFreq;
+
+    class SpectrumPoint {
+    public:
+        unsigned int index;
+        double frequency;
+        double dBm;
+        bool operator==(const SpectrumPoint& rhs) {
+            return index == rhs.index && frequency == rhs.frequency && dBm == rhs.dBm;
+        }
+    };
+
+    QTimer traceTimer;
+    TraceDifferenceGenerator<SpectrumPoint, 10> *diffGen;
+
     std::vector<QHostAddress> searchAddresses;
     std::map<QString, QHostAddress> detectedDevices;
 };
diff --git a/Software/PC_Application/LibreVNA-GUI/Device/devicedriver.h b/Software/PC_Application/LibreVNA-GUI/Device/devicedriver.h
index b04c99c..f2b3d38 100644
--- a/Software/PC_Application/LibreVNA-GUI/Device/devicedriver.h
+++ b/Software/PC_Application/LibreVNA-GUI/Device/devicedriver.h
@@ -352,7 +352,7 @@ public:
         };
         // S parameter measurements
         // Key: S parameter name, e.g. "PORT1"
-        // Value: measurement in mW (linear, not in dB). A value of 1.0 means 0dBm
+        // Value: measurement in linear voltage (linear, not in dB). A value of 1.0 means 0dBm
         std::map<QString, double> measurements;
     };
 
diff --git a/Software/PC_Application/LibreVNA-GUI/Device/tracedifferencegenerator.h b/Software/PC_Application/LibreVNA-GUI/Device/tracedifferencegenerator.h
new file mode 100644
index 0000000..978f57e
--- /dev/null
+++ b/Software/PC_Application/LibreVNA-GUI/Device/tracedifferencegenerator.h
@@ -0,0 +1,73 @@
+#ifndef TRACEDIFFERENCEGENERATOR_H
+#define TRACEDIFFERENCEGENERATOR_H
+
+#include <vector>
+#include <functional>
+
+#include <QDebug>
+
+template<typename T, int minUnchanged>
+class TraceDifferenceGenerator {
+public:
+    TraceDifferenceGenerator(std::function<void(const T&)> changeCallback) :
+        last{},
+        callback(changeCallback),
+        nextCallbackIndex(0)
+    {}
+
+    void reset() {
+        last.clear();
+        nextCallbackIndex = 0;
+    }
+
+    void newTrace(const std::vector<T> &trace) {
+        if(trace.size() > last.size()) {
+            // definitely got more points than last time. Find first point that is hasn't been transmitted and generate callbacks for it and all subsequent points
+            unsigned int i=nextCallbackIndex;
+            while(i < trace.size()) {
+                callback(trace[i]);
+                i++;
+            }
+            nextCallbackIndex = 0;
+        } else if(trace.size() < last.size()) {
+            // got less points than last time. This must be a completely new trace, generate callbacks for all points
+            for(auto &i : trace) {
+                callback(i);
+            }
+            nextCallbackIndex = 0;
+        } else {
+            // still the same amount of points.
+            unsigned int i = nextCallbackIndex;
+            unsigned int changedPoints = 0;
+            do {
+                if(i > 0) {
+                    i--;
+                } else {
+                    i = trace.size() - 1;
+                }
+                bool unchanged = last[i] == trace[i];
+                if(!unchanged) {
+                    changedPoints = (i + trace.size() - nextCallbackIndex + 1);
+                    if(changedPoints > trace.size()) {
+                        changedPoints -= trace.size();
+                    }
+                    break;
+                }
+            } while (i != nextCallbackIndex);
+            i = nextCallbackIndex;
+            while(changedPoints--) {
+                callback(trace[i]);
+                i = (i + 1) % trace.size();
+            }
+            nextCallbackIndex = i;
+        }
+        last = trace;
+    }
+
+private:
+    unsigned int nextCallbackIndex;
+    std::vector<T> last;
+    std::function<void(const T&)> callback;
+};
+
+#endif // TRACEDIFFERENCEGENERATOR_H
diff --git a/Software/PC_Application/LibreVNA-GUI/LibreVNA-GUI.pro b/Software/PC_Application/LibreVNA-GUI/LibreVNA-GUI.pro
index b2d6b7f..04e9b17 100644
--- a/Software/PC_Application/LibreVNA-GUI/LibreVNA-GUI.pro
+++ b/Software/PC_Application/LibreVNA-GUI/LibreVNA-GUI.pro
@@ -37,6 +37,7 @@ HEADERS += \
     Device/devicelog.h \
     Device/deviceusblog.h \
     Device/deviceusblogview.h \
+    Device/tracedifferencegenerator.h \
     Device/virtualdevice.h \
     Generator/generator.h \
     Generator/signalgenwidget.h \