diff --git a/examples/qa_BasicTest_usrp.log b/examples/qa_BasicTest_usrp.log
index 0ca4ecc..6464258 100644
--- a/examples/qa_BasicTest_usrp.log
+++ b/examples/qa_BasicTest_usrp.log
@@ -1,4 +1,4 @@
--------- Test Results on 2017-08-23 17:19:43 ---------
+-------- Test Results on 2017-08-23 17:39:53 ---------
 Test serie   0: [u'01 23 45 67 89 ab cd ef'] * 10
     Test   1 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed  10 out of  10 (100.00%)
     Test   2 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   9 out of  10 ( 90.00%)
@@ -12,32 +12,32 @@ Test serie   0: [u'01 23 45 67 89 ab cd ef'] * 10
 Test serie   1: [u'11 11 11'] * 1
     Test   8 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   1 out of   1 (100.00%)
     Test   9 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   1 out of   1 (100.00%)
-    Test  10 :: cr4-5 bw125 sf12 crc1 pwr1 :: passed   1 out of   1 (100.00%)
+    Test  10 :: cr4-5 bw125 sf12 crc1 pwr1 :: passed   0 out of   1 (  0.00%)
     Test  11 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   1 out of   1 (100.00%)
     Test  12 :: cr4-7 bw125 sf7  crc1 pwr1 :: passed   1 out of   1 (100.00%)
     Test  13 :: cr4-6 bw125 sf6  crc1 pwr1 :: passed   0 out of   1 (  0.00%)
     Test  14 :: cr4-6 bw125 sf7  crc1 pwr1 :: passed   1 out of   1 (100.00%)
-  => Total passed: 6 out of 7  (85.71%)
+  => Total passed: 5 out of 7  (71.43%)
 
 Test serie   2: [u'11 11 11'] * 5
     Test  15 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   5 out of   5 (100.00%)
     Test  16 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   5 out of   5 (100.00%)
     Test  17 :: cr4-5 bw125 sf12 crc1 pwr1 :: passed   1 out of   5 ( 20.00%)
-    Test  18 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   4 out of   5 ( 80.00%)
+    Test  18 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   3 out of   5 ( 60.00%)
     Test  19 :: cr4-7 bw125 sf7  crc1 pwr1 :: passed   5 out of   5 (100.00%)
     Test  20 :: cr4-6 bw125 sf6  crc1 pwr1 :: passed   1 out of   5 ( 20.00%)
     Test  21 :: cr4-6 bw125 sf7  crc1 pwr1 :: passed   5 out of   5 (100.00%)
-  => Total passed: 26 out of 35  (74.29%)
+  => Total passed: 25 out of 35  (71.43%)
 
 Test serie   3: [u'aa aa aa aa'] * 3
     Test  22 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   3 out of   3 (100.00%)
     Test  23 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   3 out of   3 (100.00%)
     Test  24 :: cr4-5 bw125 sf12 crc1 pwr1 :: passed   0 out of   3 (  0.00%)
-    Test  25 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   0 out of   3 (  0.00%)
+    Test  25 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   2 out of   3 ( 66.67%)
     Test  26 :: cr4-7 bw125 sf7  crc1 pwr1 :: passed   3 out of   3 (100.00%)
     Test  27 :: cr4-6 bw125 sf6  crc1 pwr1 :: passed   0 out of   3 (  0.00%)
     Test  28 :: cr4-6 bw125 sf7  crc1 pwr1 :: passed   3 out of   3 (100.00%)
-  => Total passed: 12 out of 21  (57.14%)
+  => Total passed: 14 out of 21  (66.67%)
 
 Test serie   4: [u'ff ff ff ff'] * 1
     Test  29 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   1 out of   1 (100.00%)
@@ -51,13 +51,13 @@ Test serie   4: [u'ff ff ff ff'] * 1
 
 Test serie   5: [u'ff ff ff ff'] * 10
     Test  36 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   9 out of  10 ( 90.00%)
-    Test  37 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   9 out of  10 ( 90.00%)
+    Test  37 :: cr4-5 bw125 sf8  crc1 pwr1 :: passed   8 out of  10 ( 80.00%)
     Test  38 :: cr4-5 bw125 sf12 crc1 pwr1 :: passed   0 out of  10 (  0.00%)
     Test  39 :: cr4-7 bw125 sf6  crc1 pwr1 :: passed   0 out of  10 (  0.00%)
     Test  40 :: cr4-7 bw125 sf7  crc1 pwr1 :: passed  10 out of  10 (100.00%)
     Test  41 :: cr4-6 bw125 sf6  crc1 pwr1 :: passed   0 out of  10 (  0.00%)
     Test  42 :: cr4-6 bw125 sf7  crc1 pwr1 :: passed  10 out of  10 (100.00%)
-  => Total passed: 38 out of 70  (54.29%)
+  => Total passed: 37 out of 70  (52.86%)
 
 Test serie   6: [u'55 55 55 55'] * 3
     Test  43 :: cr4-5 bw125 sf7  crc1 pwr1 :: passed   3 out of   3 (100.00%)
@@ -110,5 +110,5 @@ Test serie  10: [u'88 88 88 88'] * 10
   => Total passed: 40 out of 70  (57.14%)
 
 
- ====== Total passed: 240 out of 413  (58.11%) ======
+ ====== Total passed: 239 out of 413  (57.87%) ======
 
diff --git a/lib/decoder_impl.cc b/lib/decoder_impl.cc
index 16de87f..699fe12 100644
--- a/lib/decoder_impl.cc
+++ b/lib/decoder_impl.cc
@@ -536,7 +536,7 @@ namespace gr {
 
             uint32_t bin_idx = this->max_frequency_gradient_idx(samples, is_header);
             fine_sync(samples, bin_idx);
-            if(d_fine_sync >= d_decim_factor)
+            if(abs(d_fine_sync) >= d_decim_factor-1)
                 d_fine_sync = 0;
             //uint32_t bin_idx = this->get_shift_fft(samples);
 
diff --git a/lib/decoder_impl.h b/lib/decoder_impl.h
index bd42f6e..5dbc46c 100644
--- a/lib/decoder_impl.h
+++ b/lib/decoder_impl.h
@@ -119,7 +119,7 @@ namespace gr {
 
                 float cross_correlate_ifreq_fast(const float *samples_ifreq, const float *ideal_chirp, const uint32_t window);
                 void fine_sync(const gr_complex* in_samples, uint32_t bin_idx);
-                uint32_t d_fine_sync;
+                int32_t d_fine_sync;
 
                 /**
                  *  \brief  Calculates the average energy from the given samples and returns whether its higher than the given threshold.