diff --git a/transmit.py b/transmit.py
index 520d3212..d5f180f2 100644
--- a/transmit.py
+++ b/transmit.py
@@ -4,7 +4,7 @@
 import time
 from time import sleep
 #import os
-import sys
+import system
 from os import system
 from os import path
 from PIL import Image, ImageDraw, ImageFont, ImageColor
@@ -554,7 +554,7 @@ if __name__ == "__main__":
 #					system("sudo systemctl restart pacsatsim")
 				output(txLed, 0)
 				print("0")
-				rpitx = "arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + rx + "e3 > /dev/null 2>&1 &"
+				rpitx = "arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1 &"
 				stop_rpitx = "sudo killall -9 rpitx && sudo killall -9 arecord && sudo rpitx -m RF -f 434.9e3 > /dev/null 2>&1"
 				system(stop_rpitx)
 				while (True):