diff --git a/csdr.c b/csdr.c
index 98ce304..c1e4b59 100755
--- a/csdr.c
+++ b/csdr.c
@@ -2807,6 +2807,7 @@ int main(int argc, char *argv[])
 
         bpsk_costas_loop_state_t state;
         init_bpsk_costas_loop_cc(&state, decision_directed, damping_factor, loop_bandwidth);
+        errhead(); fprintf(stderr, "alpha = %f, beta = %f\n", state.alpha, state.beta);
 
         if(!initialize_buffers()) return -2;
         sendbufsize(the_bufsize);
diff --git a/grc_tests/test_bpsk_costas_loop.grc b/grc_tests/test_bpsk_costas_loop.grc
index 2aacc7f..6a6ec5d 100644
--- a/grc_tests/test_bpsk_costas_loop.grc
+++ b/grc_tests/test_bpsk_costas_loop.grc
@@ -693,7 +693,7 @@
     </param>
     <param>
       <key>commandline</key>
-      <value>tee /s/costas_input | csdr bpsk_costas_loop_cc 0.01 0.707 --dd --output_combined /s/costas_error /s/costas_dphase /s/costas_nco | tee /s/costas_output</value>
+      <value>tee /s/costas_input | csdr bpsk_costas_loop_cc 0.1 0.707 --output_combined /s/costas_error /s/costas_dphase /s/costas_nco | tee /s/costas_output</value>
     </param>
     <param>
       <key>comment</key>
diff --git a/grc_tests/test_bpsk_costas_loop_convertwavs.sh b/grc_tests/test_bpsk_costas_loop_convertwavs.sh
new file mode 100755
index 0000000..d7c08f0
--- /dev/null
+++ b/grc_tests/test_bpsk_costas_loop_convertwavs.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+sox -r 48k -t f32 -c 2 /s/costas_nco -t wav -e floating-point /s/costas_nco.wav 
+sox -r 48k -t f32 -c 1 /s/costas_error -t wav -e floating-point /s/costas_error.wav 
+sox -r 48k -t f32 -c 1 /s/costas_dphase -t wav -e floating-point /s/costas_dphase.wav 
+sox -r 48k -t f32 -c 2 /s/costas_input -t wav -e floating-point /s/costas_input.wav 
+sox -r 48k -t f32 -c 2 /s/costas_output -t wav -e floating-point /s/costas_output.wav 
+
+
+
diff --git a/libcsdr.c b/libcsdr.c
index 5a0a600..bc3eef5 100755
--- a/libcsdr.c
+++ b/libcsdr.c
@@ -2078,8 +2078,9 @@ char* timing_recovery_get_string_from_algorithm(timing_recovery_algorithm_t algo
 
 void init_bpsk_costas_loop_cc(bpsk_costas_loop_state_t* s, int decision_directed, float damping_factor, float bandwidth)
 {
+    //fprintf(stderr, "init_bpsk_costas_loop_cc: bandwidth = %f, damping_factor = %f\n", bandwidth, damping_factor);
     //based on: http://gnuradio.squarespace.com/blog/2011/8/13/control-loop-gain-values.html
-    float bandwidth_omega = 2*M_PI*bandwidth; //so that the bandwidth should be around 0.01 by default (2pi/100), and the damping_factor should be default 0.707
+    float bandwidth_omega = 2*PI*bandwidth; //so that the bandwidth should be around 0.01 by default (2pi/100), and the damping_factor should be default 0.707
     float denomiator = 1+2*damping_factor*bandwidth_omega+bandwidth_omega*bandwidth_omega;
     s->alpha = (4*damping_factor*bandwidth_omega)/denomiator;
     s->beta = (4*bandwidth_omega*bandwidth_omega)/denomiator;
@@ -2091,9 +2092,9 @@ void bpsk_costas_loop_cc(complexf* input, complexf* output, int input_size, floa
     for(int i=0;i<input_size;i++)
     {
         complexf nco_sample;
-        e_powj(&nco_sample, -s->nco_phase);
-        if(output_nco) output_nco[i]=nco_sample;
+        e_powj(&nco_sample, s->nco_phase);
         cmult(&output[i], &input[i], &nco_sample);
+        if(output_nco) output_nco[i]=nco_sample;
         float error = 0;
         if(s->decision_directed)
         {