diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 11d4d623..d43c4125 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -166,7 +166,7 @@ void setup() {
 	
   config_telem();	
 	
-//  start_isr();	
+  start_isr();	
 	
 // setup radio depending on mode 
   config_radio();