diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72 b/lib/ldpc/jtmode_codes/ldpc-144-72
index df0b8faac..8c0adaa3b 100755
--- a/lib/ldpc/jtmode_codes/ldpc-144-72
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72
@@ -10,7 +10,8 @@ set -v  # Echo commands as they are read
 #make-ldpc ldpc-144-72.pchk 80 160 12 evenboth 6x3/4x4 no4cycle
 #make-ldpc ldpc-144-72.pchk 72 144 33 evenboth 6x3/4x4 no4cycle
 #make-ldpc ldpc-144-72.pchk 72 144 8 evenboth 3 no4cycle
-cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
+make-ldpc ldpc-144-72.pchk 72 144 1087 evenboth 3x3/7x4 no4cycle
+#cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
 make-gen  ldpc-144-72.pchk ldpc-144-72.gen dense
 rand-src  ldpc-144-72.src 1 72x1000000
 encode    ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk b/lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk
new file mode 100644
index 000000000..6dbb8f8f9
Binary files /dev/null and b/lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk differ
diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-search b/lib/ldpc/jtmode_codes/ldpc-144-72-search
index 812ed0d86..72674febc 100755
--- a/lib/ldpc/jtmode_codes/ldpc-144-72-search
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72-search
@@ -11,11 +11,11 @@
 set -e  # Stop if an error occurs
 set -v  # Echo commands as they are read
 
-for i in `seq 1 1000`;
+for i in `seq 1000 2000`;
 do
   seed=$i
   echo seed $seed
-make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 6x3/4x4 no4cycle
+make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 5x3/5x4 no4cycle
 make-gen  ldpc-144-72.pchk ldpc-144-72.gen dense
 rand-src  ldpc-144-72.src 2 72x100000
 encode    ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
@@ -31,4 +31,4 @@ verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
          ldpc-144-72.src 
 
 
-done
\ No newline at end of file
+done
diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt b/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt
new file mode 100644
index 000000000..36fa99be9
--- /dev/null
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt
@@ -0,0 +1,74 @@
+make-ldpc ldpc-144-72.pchk 72 144 1087 evenboth 3x3/7x4 no4cycle
+Eliminated 259 cycles of length four by moving checks within column
+#cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
+make-gen  ldpc-144-72.pchk ldpc-144-72.gen dense
+Number of 1s per check in Inv(A) X B is 30.9
+rand-src  ldpc-144-72.src 1 72x1000000
+encode    ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
+          ldpc-144-72.enc
+Encoded 1000000 blocks, source block size 72, encoded block size 144
+
+# NOISE STANDARD DEVIATION 0.75, Eb/N0 = 2.50 dB
+
+transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.75
+Transmitted 144000000 bits
+decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.75\
+         prprp 250
+Decoded 1000000 blocks, 873685 valid.  Average 37.9 iterations, 9% bit changes
+verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
+         ldpc-144-72.src 
+Block counts: tot 1000000, with chk errs 126315, with src errs 126105, both 126091
+Total good frames: 873671  Total undetected errors: 14
+Bit error rate (on message bits only): 1.259e-02
+
+# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB
+
+transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.80
+Transmitted 144000000 bits
+decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.80\
+         prprp 250
+Decoded 1000000 blocks, 676606 valid.  Average 86.8 iterations, 9% bit changes
+verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
+         ldpc-144-72.src 
+Block counts: tot 1000000, with chk errs 323394, with src errs 322911, both 322888
+Total good frames: 676583  Total undetected errors: 23
+Bit error rate (on message bits only): 3.303e-02
+
+# NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dB
+
+transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.85
+Transmitted 144000000 bits
+decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.85\
+         prprp 250
+Decoded 1000000 blocks, 429243 valid.  Average 147.1 iterations, 9% bit changes
+verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
+         ldpc-144-72.src 
+Block counts: tot 1000000, with chk errs 570757, with src errs 569982, both 569956
+Total good frames: 429217  Total undetected errors: 26
+Bit error rate (on message bits only): 6.138e-02
+
+# NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dB
+
+transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.90
+Transmitted 144000000 bits
+decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.90\
+         prprp 250
+Decoded 1000000 blocks, 219252 valid.  Average 197.8 iterations, 8% bit changes
+verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
+         ldpc-144-72.src 
+Block counts: tot 1000000, with chk errs 780748, with src errs 779961, both 779939
+Total good frames: 219230  Total undetected errors: 22
+Bit error rate (on message bits only): 9.086e-02
+
+# NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dB
+
+transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.95
+Transmitted 144000000 bits
+decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.95\
+         prprp 250
+Decoded 1000000 blocks, 89468 valid.  Average 228.9 iterations, 7% bit changes
+verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
+         ldpc-144-72.src
+Block counts: tot 1000000, with chk errs 910532, with src errs 909905, both 909896
+Total good frames: 89459  Total undetected errors: 9
+Bit error rate (on message bits only): 1.167e-01
\ No newline at end of file