Set LO to 1GHz upon stopping doppler correction

track_doppler.py

@@ -43,7 +43,8 @@ def track_doppler(lo=None, dt=None,
                   doppler_function=doppler_harm_bl,
                   exit_event=None,
                   timeout=0.5):
-    """Sets the Local Oscillator to a frequency to correct for Doppler shift
+    """Sets the Local Oscillator to a frequency to correct for Doppler shift. When exit event is
+    set, return the LO frequency to 1GHz.
     
     Args:
         lo (LocalOscillator): the local oscillator of which the frequency will be set.
@@ -73,3 +74,4 @@ def track_doppler(lo=None, dt=None,
         dfreq = 1*u.GHz + tracking_frequency - freq_doppler
         lo.frequency = dfreq
         exit_event.wait(timeout=timeout)
+    lo.frequency = 1*u.GHz