diff --git a/lib/ldpc/jtmode_codes/compare.lab b/lib/ldpc/jtmode_codes/compare.lab
index a90fc637e..51a6ef5ef 100644
--- a/lib/ldpc/jtmode_codes/compare.lab
+++ b/lib/ldpc/jtmode_codes/compare.lab
@@ -1,4 +1,5 @@
-3.9 0.15   "(198,72) JTMSK" 
-2.7 0.003  "(174,87) LDPC"
-5.6 0.00003  "(160,80) LDPC"
-5.6 0.00008   "(140,80) LDPC"
+5.7 0.0002   "CC/CRC15" 
+5.5 0.0001   "(128,82)" 
+5.7 0.0004   "(128,82)/20" 
+5.6 0.002    "(128,82)/5" 
+5.5 0.000007   "(160,80)"
diff --git a/lib/ldpc/jtmode_codes/fig_compare.gnuplot b/lib/ldpc/jtmode_codes/fig_compare.gnuplot
index 8ef39c12e..4fd4d9400 100644
--- a/lib/ldpc/jtmode_codes/fig_compare.gnuplot
+++ b/lib/ldpc/jtmode_codes/fig_compare.gnuplot
@@ -13,15 +13,17 @@ set mytics 10
 set grid
 set logscale y
 plot [-1:6] [1e-6:1] \
+   "jtmskcode.results" using 1:(100000-$2)/100000 with linespoints lt 1 lw 2 pt 1, \
+   "jtmskcode.results" using 1:($5/1000000) with linespoints lt 1 lw 2 pt 1, \
    "160-80-sf4.results" using 1:(1000000-$2)/1000000 with linespoints lt 2 lw 2 pt 2, \
    "160-80-sf4.results" using 1:($3/1000000) with linespoints lt 2 lw 2 pt 2, \
-   "jtmskcode.results" using 1:(100000-$2)/100000 with linespoints lt 1 lw 2 pt 7, \
-   "jtmskcode.results" using 1:($5/1000000) with linespoints lt 1 lw 2 pt 7, \
-   "140-80-sf5.results" using 1:(100000-$2)/100000 with linespoints lt 4 lw 2 pt 4, \
-   "140-80-sf5.results" using 1:($3/100000) with linespoints lt 4 lw 2 pt 4, \
-   "174-87-sf6.results" using 1:(1000000-$2)/1000000 with linespoints lt 5 lw 2 pt 5, \
-   "174-87-sf6.results" using 1:($3/1000000) with linespoints lt 5 lw 2 pt 5, \
+   "128-82-sf10.results" using 1:(1000000-$2)/1000000 with linespoints lt 3 lw 2 pt 3, \
+   "128-82-sf10.results" using 1:($3/1000000) with linespoints lt 3 lw 2 pt 3, \
+   "128-82-sf11.results" using 1:(1000000-$2)/1000000 with linespoints lt 4 lw 2 pt 4, \
+   "128-82-sf11.results" using 1:($3/1000000) with linespoints lt 4 lw 2 pt 4, \
+   "128-82-sf11.results" using 1:(1000000-$4)/1000000 with linespoints lt 4 lw 2 pt 4, \
+   "128-82-sf11.results" using 1:($5/1000000) with linespoints lt 4 lw 2 pt 4, \
+   "128-64.results" using 1:(1000000-$2)/1000000 with linespoints lt 5 lw 2 pt 5, \
+   "128-64.results" using 1:($3/1000000) with linespoints lt 5 lw 2 pt 5, \
    "compare.lab" with labels
 exit
-#   "160-80-sf4.results" using 1:(1000000-$4)/1000000 with linespoints lt 3 lw 2 pt 4, \
-#   "160-80-sf4.results" using 1:($5/1000000) with linespoints lt 2 lw 3 pt 4, \
diff --git a/lib/ldpc/jtmode_codes/ldpc-search b/lib/ldpc/jtmode_codes/ldpc-search
index bdbd7caf7..5591c3adb 100755
--- a/lib/ldpc/jtmode_codes/ldpc-search
+++ b/lib/ldpc/jtmode_codes/ldpc-search
@@ -1,22 +1,24 @@
 #!/bin/sh
 # search for a good code
-n=160
-k=72
+#  make-ldpc ldpc.pchk $m $n $seed evenboth 2x3/8x4 no4cycle
+n=128
+k=80
 m=$((n-k))
+niterations=5
 
 set -e  # Stop if an error occurs
 
-rand-src  ldpc.src 2 "$k"x1000000
+rand-src  ldpc.src 2 "$k"x100000
 
-for i in `seq 1 1000`
+for i in `seq 1000 2000`
 do
   seed=$i
   echo seed $seed
-  make-ldpc ldpc.pchk $m $n $seed evenboth 2x3/8x4 no4cycle
+  make-ldpc ldpc.pchk $m $n $seed evenboth 120x3/8x4 no4cycle
   make-gen  ldpc.pchk ldpc.gen dense
   encode    ldpc.pchk ldpc.gen ldpc.src ldpc.enc
-  transmit ldpc.enc ldpc.rec 1 awgn 0.8
-  decode   ldpc.pchk ldpc.rec ldpc.dec awgn 0.80 prprp 250
+  transmit ldpc.enc ldpc.rec 1 awgn 0.7
+  decode   ldpc.pchk ldpc.rec ldpc.dec awgn 0.70 prprp $niterations
   verify   ldpc.pchk ldpc.dec ldpc.gen ldpc.src
 done
 
diff --git a/lib/ldpc/jtmode_codes/ldpc-waterfall b/lib/ldpc/jtmode_codes/ldpc-waterfall
index 75388d8be..502eb0bc6 100755
--- a/lib/ldpc/jtmode_codes/ldpc-waterfall
+++ b/lib/ldpc/jtmode_codes/ldpc-waterfall
@@ -1,24 +1,27 @@
 #!/bin/sh
 # this script characterizes a single code over a range of Eb/N0
+# a baseband signal with mean power = 1 
 # note relationship between noise standard deviation, sigma, and Eb/No:
 # Eb/No = 1/(2*R*sigma^2)
 # If R=1/2, then Eb/No = 1/sigma^2 
+# make-ldpc ldpc.pchk "$m" "$n" $seed evenboth 2x3/8x4 no4cycle
 
 set -e  # Stop if an error occurs
 #set -v  # Echo commands as they are read
 
-n=174
-k=87
+n=128
+k=82
 m=$((n-k))
-seed=4
-ntrials=1000000
+seed=182
+ntrials=10000
+niterations=10
 
 rate=$(echo "scale=5; $k/$n" | bc)
 echo n=$n k=$k rate=$rate m=$m
 
-make-ldpc ldpc.pchk "$m" "$n" $seed evenboth 2x3/8x4 no4cycle
+make-ldpc ldpc.pchk "$m" "$n" $seed evenboth 9x3/1x4 no4cycle
 
-make-gen  ldpc.pchk ldpc.gen dense
+make-gen  ldpc.pchk ldpc.gen sparse
 rand-src  ldpc.src 1 "$k"x"$ntrials"
 encode    ldpc.pchk ldpc.gen ldpc.src ldpc.enc
 
@@ -30,9 +33,6 @@ do
   echo db $db ebno $ebno sigma $sigma
 
   transmit ldpc.enc ldpc.rec 1 awgn $sigma
-  decode   ldpc.pchk ldpc.rec ldpc.dec awgn $sigma\
-         prprp 250
-  verify   ldpc.pchk ldpc.dec ldpc.gen \
-         ldpc.src 
-
+  decode   ldpc.pchk ldpc.rec ldpc.dec awgn $sigma prprp $niterations 
+  verify   ldpc.pchk ldpc.dec ldpc.gen ldpc.src
 done