diff --git a/plugins/channelrx/noisefigure/noisefigure.cpp b/plugins/channelrx/noisefigure/noisefigure.cpp
index c5aa2a23f..34b5f4682 100644
--- a/plugins/channelrx/noisefigure/noisefigure.cpp
+++ b/plugins/channelrx/noisefigure/noisefigure.cpp
@@ -311,7 +311,7 @@ void NoiseFigure::nextState()
             }
         }
         m_state = SET_SWEEP_VALUE;
-        QTimer::singleShot(0, this, SLOT(nextState()));
+        QTimer::singleShot(0, this, &NoiseFigure::nextState);
         break;
 
     case SET_SWEEP_VALUE:
@@ -320,7 +320,7 @@ void NoiseFigure::nextState()
         {
             qDebug() << "NoiseFigure::nextState: Set " << m_settings.m_setting << " to " << m_sweepValue;
             m_state = POWER_ON;
-            QTimer::singleShot(100, this, SLOT(nextState()));
+            QTimer::singleShot(100, this, &NoiseFigure::nextState);
         } else
         {
             qDebug() << "NoiseFigure::nextState: Unable to set " << m_settings.m_setting << " to " << m_sweepValue;
@@ -330,7 +330,7 @@ void NoiseFigure::nextState()
     case POWER_ON:
         // Power on noise source
         powerOn();
-        QTimer::singleShot(m_settings.m_powerDelay * 1000.0, this, SLOT(nextState()));
+        QTimer::singleShot(m_settings.m_powerDelay * 1000.0, this, &NoiseFigure::nextState);
         m_state = MEASURE_ON;
         break;
 
@@ -343,7 +343,7 @@ void NoiseFigure::nextState()
     case POWER_OFF:
         // Power off noise source
         powerOff();
-        QTimer::singleShot(m_settings.m_powerDelay * 1000.0, this, SLOT(nextState()));
+        QTimer::singleShot(m_settings.m_powerDelay * 1000.0, this, &NoiseFigure::nextState);
         m_state = MEASURE_OFF;
         break;
 
@@ -392,7 +392,7 @@ void NoiseFigure::nextState()
                 m_sweepValue += m_settings.m_step * scaleFactor;
             }
             m_state = SET_SWEEP_VALUE;
-            QTimer::singleShot(0, this, SLOT(nextState()));
+            QTimer::singleShot(0, this, &NoiseFigure::nextState);
         }
         break;
     }
@@ -490,14 +490,14 @@ bool NoiseFigure::handleMessage(const Message& cmd)
             if (!m_settings.m_visaDevice.isEmpty())
             {
                 if (openVISADevice()) {
-                    QTimer::singleShot(0, this, SLOT(nextState()));
+                    QTimer::singleShot(0, this, &NoiseFigure::nextState);
                 } else if (getMessageQueueToGUI()) {
                     getMessageQueueToGUI()->push(MsgFinished::create(QString("Failed to open VISA device %1").arg(m_settings.m_visaDevice)));
                 }
             }
             else
             {
-                QTimer::singleShot(0, this, SLOT(nextState()));
+                QTimer::singleShot(0, this, &NoiseFigure::nextState);
             }
         }
         else
diff --git a/plugins/channelrx/noisefigure/noisefigurecontroldialog.cpp b/plugins/channelrx/noisefigure/noisefigurecontroldialog.cpp
index dcf1ddfbd..db46f0583 100644
--- a/plugins/channelrx/noisefigure/noisefigurecontroldialog.cpp
+++ b/plugins/channelrx/noisefigure/noisefigurecontroldialog.cpp
@@ -17,8 +17,6 @@
 
 #include <QDebug>
 
-#include "util/visa.h"
-
 #include "noisefigurecontroldialog.h"
 
 NoiseFigureControlDialog::NoiseFigureControlDialog(NoiseFigureSettings *settings, QWidget* parent) :
@@ -33,13 +31,6 @@ NoiseFigureControlDialog::NoiseFigureControlDialog(NoiseFigureSettings *settings
     ui->powerOnSCPI->setPlainText(settings->m_powerOnSCPI);
     ui->powerOffSCPI->setPlainText(settings->m_powerOffSCPI);
     ui->delay->setValue(settings->m_powerDelay);
-    VISA visa;
-    if (!visa.isAvailable())
-    {
-        ui->device->setEnabled(false);
-        ui->powerOnSCPI->setEnabled(false);
-        ui->powerOffSCPI->setEnabled(false);
-    }
 }
 
 NoiseFigureControlDialog::~NoiseFigureControlDialog()
diff --git a/plugins/channelrx/noisefigure/noisefigureplugin.cpp b/plugins/channelrx/noisefigure/noisefigureplugin.cpp
index 4c34ebc79..c674eb172 100644
--- a/plugins/channelrx/noisefigure/noisefigureplugin.cpp
+++ b/plugins/channelrx/noisefigure/noisefigureplugin.cpp
@@ -29,7 +29,7 @@
 const PluginDescriptor NoiseFigurePlugin::m_pluginDescriptor = {
     NoiseFigure::m_channelId,
     QStringLiteral("Noise Figure"),
-    QStringLiteral("7.0.0"),
+    QStringLiteral("7.3.1"),
     QStringLiteral("(c) Jon Beniston, M7RCE"),
     QStringLiteral("https://github.com/f4exb/sdrangel"),
     true,