diff --git a/lib/radio/nco/src/tb_nco_cordic.vhd b/lib/radio/nco/src/tb_nco_cordic.vhd
index 78b31de..4292271 100644
--- a/lib/radio/nco/src/tb_nco_cordic.vhd
+++ b/lib/radio/nco/src/tb_nco_cordic.vhd
@@ -57,9 +57,9 @@ ARCHITECTURE behavior OF tb_nco IS
 	END COMPONENT;
 
 	--Constants
-	constant f : REAL := 15.0E6;
-	constant df : REAL := 10.0E3;
 	constant fa : REAL := 100.0E6;
+	constant f : REAL := 5.0*fa/24.0;
+	constant df : REAL := 10.0E3;
 	constant PERIOD : time := 10 ns;
 	constant nbits_wave_frac : integer := nbits_wave-2;
 	
diff --git a/lib/radio/nco/src/tb_nco_lut.vhd b/lib/radio/nco/src/tb_nco_lut.vhd
index 05f46b0..a829ea4 100644
--- a/lib/radio/nco/src/tb_nco_lut.vhd
+++ b/lib/radio/nco/src/tb_nco_lut.vhd
@@ -68,9 +68,9 @@ ARCHITECTURE behavior OF tb_nco IS
 	END COMPONENT;
 
 	--Constants
-	constant f : REAL := 15.0E6;
-	constant df : REAL := 10.0E3;
 	constant fa : REAL := 100.0E6;
+	constant f : REAL := 5.0*fa/24.0;
+	constant df : REAL := 10.0E3;
 	constant PERIOD : time := 10 ns;
 	constant nbits_wave_frac : integer := nbits_wave;