diff --git a/artemis.py b/artemis.py
index 464a5a9..8596948 100644
--- a/artemis.py
+++ b/artemis.py
@@ -14,8 +14,7 @@ from PyQt5.QtWidgets import (QMainWindow,
                              QListWidgetItem,
                              QMessageBox,
                              QSplashScreen,
-                             QTreeWidgetItem,
-                             QTabWidget,)
+                             QTreeWidgetItem,)
 from PyQt5.QtGui import QPixmap
 from PyQt5 import uic
 from PyQt5.QtCore import (QFileInfo,
@@ -267,7 +266,6 @@ class Artemis(QMainWindow, Ui_MainWindow):
         self.reset_frequency_filters_btn.clicked.connect(
             partial(self.reset_fb_filters, Ftype.FREQ)
         )
-        self.main_tab.currentChanged.connect(self.onChange)
 
         # Manage bandwidth filters.
 
@@ -1531,7 +1529,7 @@ class Artemis(QMainWindow, Ui_MainWindow):
                 Constants.SPECTRA_FOLDER,
                 spectrogram_name + Constants.SPECTRA_EXT
             )
-            if not QFileInfo(path_spectr).exists() or self.main_tab.currentIndex()==3:
+            if not QFileInfo(path_spectr).exists():
                 path_spectr = Constants.DEFAULT_NOT_AVAILABLE
         else:
             path_spectr = default_pic
@@ -1614,13 +1612,7 @@ class Artemis(QMainWindow, Ui_MainWindow):
         if self.forecast_data.is_updating:
             self.forecast_data.shutdown_thread()
         super().closeEvent(event)
-    
-    @pyqtSlot()
-    def onChange(self):
-        if self.main_tab.currentIndex()==3:
-            self.spectrogram.setPixmap(QPixmap(Constants.DEFAULT_NOT_AVAILABLE))
-        else:
-            self.display_spectrogram()
+
 
 if __name__ == '__main__':
     my_app = QApplication(sys.argv)
diff --git a/download_window.py b/download_window.py
index 2ff1d19..7d16728 100644
--- a/download_window.py
+++ b/download_window.py
@@ -1,6 +1,6 @@
 from PyQt5 import uic
 from PyQt5.QtCore import Qt, pyqtSlot, pyqtSignal
-from PyQt5.QtWidgets import QWidget, QDesktopWidget
+from PyQt5.QtWidgets import QWidget
 from threads import DownloadThread, ThreadStatus
 from utilities import pop_up, resource_path
 from constants import Constants, Messages