diff --git a/groundstation/pacsat.sh b/groundstation/pacsat.sh
index 0a1e64da..7618eaa3 100755
--- a/groundstation/pacsat.sh
+++ b/groundstation/pacsat.sh
@@ -325,7 +325,7 @@ else
        else
 
         echo "8: Using USB Sound Card for Receive and Transmit with RTS PTT"
-        ADEVICE="ADEVICE plughw:CARD=Device,DEV=0" 
+        ADEVICE="ADEVICE shared_mic plughw:CARD=Device,DEV=0" 
         PTT="PTT /dev/ttyUSB0 RTS" 
         
        fi