diff --git a/devsetup.cpp b/devsetup.cpp
index 743231275..816c1ae1a 100644
--- a/devsetup.cpp
+++ b/devsetup.cpp
@@ -109,6 +109,7 @@ void DevSetup::initDlg()
   ui.mult570SpinBox->setValue(m_mult570);
   ui.mult570TxSpinBox->setValue(m_mult570Tx);
   ui.cal570SpinBox->setValue(m_cal570);
+  ui.sbTxOffset->setValue(m_TxOffset);
   sscanf(m_colors.toLatin1(),"%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
          &r,&g,&b,&r0,&g0,&b0,&r1,&g1,&b1,&r2,&g2,&b2,&r3,&g3,&b3);
   updateColorLabels();
@@ -178,6 +179,7 @@ void DevSetup::accept()
   m_mult570=ui.mult570SpinBox->value();
   m_mult570Tx=ui.mult570TxSpinBox->value();
   m_cal570=ui.cal570SpinBox->value();
+  m_TxOffset=ui.sbTxOffset->value();
 
   QDialog::accept();
 }
@@ -342,4 +344,11 @@ void DevSetup::on_rbIQXT_toggled(bool checked)
   m_bIQxt=checked;
   ui.mult570TxSpinBox->setEnabled(m_bIQxt);
   ui.label_25->setEnabled(m_bIQxt);
+  ui.sbTxOffset->setEnabled(m_bIQxt);
+  ui.label_26->setEnabled(m_bIQxt);
+}
+
+void DevSetup::on_sbTxOffset_valueChanged(double f)
+{
+  m_TxOffset=f;
 }
diff --git a/devsetup.h b/devsetup.h
index 494e340e9..148f76c4e 100644
--- a/devsetup.h
+++ b/devsetup.h
@@ -30,6 +30,7 @@ public:
 
   double  m_fAdd;
   double  m_cal570;
+  double  m_TxOffset;
 
   bool    m_xpolx;
   bool    m_network;
@@ -78,8 +79,8 @@ private slots:
   void on_sbBlue3_valueChanged(int arg1);
   void on_pushButton_5_clicked();
   void on_mult570TxSpinBox_valueChanged(int arg1);
-
-  void on_rbIQXT_toggled(bool checked);
+  void on_rbIQXT_toggled(bool checked);  
+  void on_sbTxOffset_valueChanged(double f);
 
 private:
   int r,g,b,r0,g0,b0,r1,g1,b1,r2,g2,b2,r3,g3,b3;
diff --git a/devsetup.ui b/devsetup.ui
index 3e9617f76..31f7708cd 100644
--- a/devsetup.ui
+++ b/devsetup.ui
@@ -17,7 +17,7 @@
    <item>
     <widget class="QTabWidget" name="ioTabWidget">
      <property name="currentIndex">
-      <number>0</number>
+      <number>3</number>
      </property>
      <widget class="QWidget" name="tab">
       <attribute name="title">
@@ -1461,17 +1461,17 @@
       <attribute name="title">
        <string>Si570 Control</string>
       </attribute>
-      <widget class="QWidget" name="layoutWidget_6">
+      <widget class="QWidget" name="">
        <property name="geometry">
         <rect>
-         <x>40</x>
-         <y>40</y>
+         <x>41</x>
+         <y>41</y>
          <width>272</width>
-         <height>220</height>
+         <height>248</height>
         </rect>
        </property>
-       <layout class="QVBoxLayout" name="verticalLayout_9">
-        <item>
+       <layout class="QGridLayout" name="gridLayout">
+        <item row="0" column="0">
          <layout class="QHBoxLayout" name="horizontalLayout_19">
           <item>
            <widget class="QLabel" name="label_24">
@@ -1502,7 +1502,7 @@
           </item>
          </layout>
         </item>
-        <item>
+        <item row="1" column="0">
          <spacer name="verticalSpacer_4">
           <property name="orientation">
            <enum>Qt::Vertical</enum>
@@ -1518,7 +1518,7 @@
           </property>
          </spacer>
         </item>
-        <item>
+        <item row="2" column="0">
          <layout class="QHBoxLayout" name="horizontalLayout_9">
           <item>
            <widget class="QLabel" name="label_12">
@@ -1570,7 +1570,56 @@
           </item>
          </layout>
         </item>
-        <item>
+        <item row="3" column="0">
+         <layout class="QHBoxLayout" name="horizontalLayout_21">
+          <item>
+           <widget class="QLabel" name="label_26">
+            <property name="text">
+             <string>Tx Offset (MHz):</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <spacer name="horizontalSpacer_22">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+          <item>
+           <widget class="QDoubleSpinBox" name="sbTxOffset">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>0</height>
+             </size>
+            </property>
+            <property name="decimals">
+             <number>3</number>
+            </property>
+            <property name="maximum">
+             <double>150.000000000000000</double>
+            </property>
+            <property name="value">
+             <double>130.900000000000006</double>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+        <item row="4" column="0">
          <layout class="QHBoxLayout" name="horizontalLayout_20">
           <item>
            <widget class="QLabel" name="label_25">
@@ -1622,7 +1671,7 @@
           </item>
          </layout>
         </item>
-        <item>
+        <item row="5" column="0">
          <layout class="QHBoxLayout" name="horizontalLayout_10">
           <item>
            <widget class="QLabel" name="label_13">
@@ -1674,7 +1723,7 @@
           </item>
          </layout>
         </item>
-        <item>
+        <item row="6" column="0">
          <spacer name="verticalSpacer_5">
           <property name="orientation">
            <enum>Qt::Vertical</enum>
@@ -1690,7 +1739,7 @@
           </property>
          </spacer>
         </item>
-        <item>
+        <item row="7" column="0">
          <widget class="QCheckBox" name="cbInitIQplus">
           <property name="text">
            <string>Initialize IQ+  on startup</string>
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 217e67eb0..9f710462e 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -255,6 +255,7 @@ MainWindow::MainWindow(QWidget *parent) :
   g_pWideGraph->m_mult570=m_mult570;
   g_pWideGraph->m_mult570Tx=m_mult570Tx;
   g_pWideGraph->m_cal570=m_cal570;
+  g_pWideGraph->m_TxOffset=m_TxOffset;
   if(m_initIQplus) g_pWideGraph->initIQplus();
 
 // Create "m_worked", a dictionary of all calls in wsjt.log
@@ -379,6 +380,7 @@ void MainWindow::writeSettings()
   settings.setValue("Mult570",m_mult570);
   settings.setValue("Mult570Tx",m_mult570Tx);
   settings.setValue("Cal570",m_cal570);
+  settings.setValue("TxOffset",m_TxOffset);
   settings.setValue("Colors",m_colors);
   settings.endGroup();
 }
@@ -471,6 +473,7 @@ void MainWindow::readSettings()
   m_mult570=settings.value("Mult570",2).toInt();
   m_mult570Tx=settings.value("Mult570Tx",1).toInt();
   m_cal570=settings.value("Cal570",0.0).toDouble();
+  m_TxOffset=settings.value("TxOffset",130.9).toDouble();
   m_colors=settings.value("Colors","000066ff0000ffff00969696646464").toString();
   settings.endGroup();
 
@@ -634,6 +637,7 @@ void MainWindow::on_actionDeviceSetup_triggered()               //Setup Dialog
   dlg.m_initIQplus=m_initIQplus;
   dlg.m_bIQxt=m_bIQxt;
   dlg.m_cal570=m_cal570;
+  dlg.m_TxOffset=m_TxOffset;
   dlg.m_mult570=m_mult570;
   dlg.m_mult570Tx=m_mult570Tx;
   dlg.m_colors=m_colors;
@@ -673,6 +677,7 @@ void MainWindow::on_actionDeviceSetup_triggered()               //Setup Dialog
     g_pMessages->setColors(m_colors);
     g_pBandMap->setColors(m_colors);
     m_cal570=dlg.m_cal570;
+    m_TxOffset=dlg.m_TxOffset;
     m_mult570Tx=dlg.m_mult570Tx;
     g_pWideGraph->m_mult570=m_mult570;
     g_pWideGraph->m_mult570Tx=m_mult570Tx;
@@ -1388,6 +1393,7 @@ void MainWindow::guiUpdate()
   static int iptt=0;
   static bool btxok0=false;
   static bool bTune0=false;
+  static bool bMonitoring0=false;
   static int nc0=1;
   static int nc1=1;
   static char msgsent[23];
@@ -1407,7 +1413,12 @@ void MainWindow::guiUpdate()
   double t2p=fmod(tsec,120.0/m_nfast);
   bool bTxTime = (t2p >= tx1) and (t2p < tx2);
 
-  if(bTune0 and !bTune) btxok=false;
+  if(bTune0 and !bTune) {
+    btxok=false;
+    m_monitoring=bMonitoring0;
+    soundInThread.setMonitoring(m_monitoring);
+  }
+  if(bTune and !bTune0) bMonitoring0=m_monitoring;
   bTune0=bTune;
 
   if(m_auto or bTune) {
diff --git a/mainwindow.h b/mainwindow.h
index 0d218377d..2268f2533 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -170,6 +170,7 @@ private:
 //    double  m_IQamp;
 //    double  m_IQphase;
     double  m_cal570;
+    double  m_TxOffset;
 
     bool    m_monitoring;
     bool    m_transmitting;
diff --git a/set570.cpp b/set570.cpp
index 50a98d6f4..ca9b4ef9e 100644
--- a/set570.cpp
+++ b/set570.cpp
@@ -88,6 +88,11 @@ void sweepm_freq(void);
 
 int set570(double freq_MHz)
 {
+//###
+//  qDebug() << "A" << freq_MHz;
+//  if(freq_MHz != 999.0) return 0;
+//###
+
   char * my_usbSerialID = NULL;
 
 // MAIN MENU DIALOG
diff --git a/widegraph.cpp b/widegraph.cpp
index 42a8c56d9..12aff93ea 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -360,7 +360,9 @@ void WideGraph::tx570()
   if(m_bForceCenterFreq) datcom_.fcenter=m_dForceCenterFreq;
   m_bIQxt=true;
   double f=ui->widePlot->txFreq();
-  double f1=m_mult570Tx*(1.0+0.000001*m_cal570) * f;
+//  double f1=m_mult570Tx*(1.0+0.000001*m_cal570) * f;
+  double f1=m_mult570Tx*(1.0+0.000001*m_cal570) * (f - m_TxOffset);
+
 #ifdef WIN32
   int iret=set570(f1);
   if(iret != 0) {
diff --git a/widegraph.h b/widegraph.h
index c5862bdd6..c70e6dd8e 100644
--- a/widegraph.h
+++ b/widegraph.h
@@ -21,6 +21,7 @@ public:
   qint32 m_mult570Tx;
   double m_dForceCenterFreq;
   double m_cal570;
+  double m_TxOffset;
 
   void   dataSink2(float s[], int nkhz, int ihsym, int ndiskdata,
                    uchar lstrong[]);