diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 7c295f0a..da89f5ee 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -3461,10 +3461,10 @@ bool TimerHandler0(struct repeating_timer *t) {
 //	Serial.print("\nR");
 //	Serial.print(" ");
 //	Serial.println(millis());
-//    if (debug_mode) {		  
+    if (bufLen != 0) {		  
       Serial.print("R Microseconds: ");
       Serial.println((float)(micros() - micro_timer)/(float)bufLen);
-//    }
+    }
     micro_timer = micros();
   }
 }
@@ -3490,7 +3490,7 @@ void start_isr() {
 	
 //  if (ITimer0.attachInterruptInterval(833, TimerHandler0))	
 //  if (ITimer0.attachInterruptInterval(804, TimerHandler0))	
-    if (ITimer0.attachInterruptInterval(828, TimerHandler0))	// was was 827 and 828
+    if (ITimer0.attachInterruptInterval(820, TimerHandler0))	// was was 828 (841) and 828
 //  if (ITimer0.attachInterruptInterval(1667, TimerHandler0))
     {
       if (debug_mode)