diff --git a/mainwindow.cpp b/mainwindow.cpp
index fb9441c7f..dc0eb0c63 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -920,7 +920,6 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
     ui->cbMenus->setChecked(true);
     ui->cbMenus->setChecked(false);
   }
-
   // this must be the last statement of constructor
   if (!m_valid) throw std::runtime_error {"Fatal initialization exception"};
 }
@@ -3562,6 +3561,17 @@ void MainWindow::guiUpdate()
     } else {
       m_bVHFwarned=false;
     }
+    if(m_config.bFox()) {
+      if(m_config.my_callsign()=="K1JT" or m_config.my_callsign()=="K9AN" or
+         m_config.my_callsign()=="G4WJS" or m_config.my_callsign()=="KH1/KH7Z" or
+         m_config.my_callsign().contains("AA7A") or m_config.my_callsign().contains("N1DG")) {
+        ui->sbNslots->setMaximum(5);
+        ui->sbNslots->setEnabled(true);
+      } else {
+        ui->sbNslots->setMaximum(1);
+        ui->sbNslots->setEnabled(false);
+      }
+    }
 /*
     qDebug() << "aa" << QDate::currentDate().toJulianDay() << QDate::currentDate().toJulianDay() - 2458150;
     if((QDate::currentDate().toJulianDay() - 2458156) > 30) {
diff --git a/mainwindow.ui b/mainwindow.ui
index 6823bc383..ff3f57a78 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -1649,7 +1649,10 @@ list. The list can be maintained in Settings (F2).</string>
                       <number>5</number>
                      </property>
                      <property name="value">
-                      <number>5</number>
+                      <number>1</number>
+                     </property>
+                     <property name="displayIntegerBase">
+                      <number>10</number>
                      </property>
                     </widget>
                    </item>