diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 53015745..3dc4db3b 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -4121,7 +4121,7 @@ void transmit_cw(int freq, float duration) {  // freq in Hz, duration in millise
     unsigned long start = micros();
 //    clockgen.enableOutputs(true);
     if (clockgen_present) {	  
-      clockgen.enableOutputOnly(0);
+      clockgen.enableOutputOnly(1);
       digitalWrite(BPSK_CONTROL_B, HIGH); 
     }
     while((micros() - start) < duration_us)  { }