diff --git a/groundstation/pacsat.sh b/groundstation/pacsat.sh
index b9b2b398..08fe543e 100755
--- a/groundstation/pacsat.sh
+++ b/groundstation/pacsat.sh
@@ -325,7 +325,7 @@ else
 
         echo "8: Using Sound Card for Receive and Transmit"
         ADEVICE="ADEVICE plughw:CARD=Device,DEV=0" 
-        PTT="PTT GPIOD gpiochip0 17" 
+        PTT="PTT /dev/ttyUSB0 RTS" 
         
        fi
     fi