diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index a83babb7..703ef5e0 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -4231,6 +4231,9 @@ void set_lat_lon() {
 
 void program_radio() {
 	
+  digitalWrite(PD_PIN, HIGH);  // enable SR_FRS
+  digitalWrite(PTT_PIN, HIGH);  // stop transmit	
+	
   DumbTXSWS mySerial(SWTX_PIN); // TX pin
   mySerial.begin(9600);