diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index c2f79954..77a926ba 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -275,6 +275,7 @@ void loop() {
 	  
       if (debug_mode)	  	  
         Serial.println("Start transmit!!!");
+      digitalWrite(PD_PIN, HIGH);  // Enable SR_FRS	  
       digitalWrite(PTT_PIN, LOW);  // start transmit
       transmit_led(HIGH);