diff --git a/lib/fer b/lib/fer
index a13b185f5..7a74bf2a6 100755
--- a/lib/fer
+++ b/lib/fer
@@ -5,21 +5,24 @@
 # For better performance, copy this script and jt65, jt65sim
 # executables to a ramdisk and run from there.
 
+mode=C
+spread=4.0
+
+for i in `seq 0 21`;
+do
 nruns=0
 ndecodes=0
 ngood=0
 nbad=0
-snr=-26.0
-
+snr=$((-25+$i))
 #while [ $[ $nruns - $ngood ] -lt 200 ] 
 #while [ $ngood -lt 200 ] 
-while [ $nruns -lt 20000 ] 
-
+while [ $nruns -lt 1000 ] 
 do
   rm 000000_0001.wav
-  ./jt65sim -n 1 -d 0.0 -s \\$snr > /dev/null
+  ./jt65sim -m $mode -n 1 -d $spread -s \\$snr > /dev/null
   rm decoded.txt
-  ./jt65 -a 10 -f 1500 -n 10 -s 000000_0001.wav > decoded.txt
+  ./jt65 -m $mode -a 10 -f 1500 -n 1000 -s 000000_0001.wav > decoded.txt
   if [ -e decoded.txt ]; then
     nd=$( wc -l < decoded.txt )
     ng=$( grep "K1ABC" decoded.txt | wc -l )
@@ -35,4 +38,4 @@ do
   echo -en snr: $snr nruns: $nruns ndecodes: $ndecodes ngood: $ngood nbad: $nbad nmissed: $nmissed wer: $pe success: $ps"\r"
 done
 echo snr: $snr nruns: $nruns ndecodes: $ndecodes ngood: $ngood nbad: $nbad nmissed: $nmissed wer: $pe success: $ps
-
+done