diff --git a/transmit.py b/transmit.py
index 2bb7f7b1..4344c238 100644
--- a/transmit.py
+++ b/transmit.py
@@ -621,7 +621,7 @@ def transmit_carrier(duration):
 	global tx_doppler_freq_hz
 	global txLed
 #	command = "timeout " + str(duration) + " sudo tune -f " + str(tx_doppler_freq_hz) + " > /dev/null 2>&1" # 434.9e6
-	start = "sudo tune -f " + str(tx_doppler_freq_hz) + " > /dev/null 2>&1" # 434.9e6
+	start = "sudo tune -f " + str(tx_doppler_freq_hz) + " > /dev/null 2>&1 &" # 434.9e6
 	stop = "sudo killall -9 tune"
 	output(txLed, 1)
 	system(start)