diff --git a/script/RFscan/SchottkyScan.py b/script/RFscan/SchottkyScan.py
index c65cb81..21e9d57 100644
--- a/script/RFscan/SchottkyScan.py
+++ b/script/RFscan/SchottkyScan.py
@@ -1,7 +1,7 @@
 import  ch.psi.pshell.epics.ControlledVariable as ControlledVariable
 
 if get_exec_pars().source == CommandSource.ui:
-    start   = -10.0
+    start   = -170.0
     stop    = 180.0
     step    = 5.0
     nb      = 3