diff --git a/FM.cpp b/FM.cpp
index ee060b1..17e6462 100644
--- a/FM.cpp
+++ b/FM.cpp
@@ -21,23 +21,15 @@
 #include "FM.h"
 
 q15_t FILTER_COEFFS[] = {
-     -4,     0,     1,    -2,    -9,   -15,   -16,    -11,    -2,     4,     6,     1,    -7,   -15,
-    -17,    -9,     3,    16,    21,    14,     0,    -12,   -14,    -1,    21,    43,    51,    41,
-     19,    -1,    -5,    14,    50,    85,    98,     81,    44,     9,     0,    28,    80,   130,
-    147,   120,    60,     2,   -17,    16,    88,    157,   178,   132,    39,   -52,   -90,   -49,
-     46,   140,   166,    96,   -42,  -182,  -245,   -195,   -63,    67,   106,     7,  -194,  -399,
-   -496,  -429,  -238,   -41,    26,  -106,  -396,   -697,  -843,  -743,  -444,  -121,    12,  -165,
-   -603, -1084, -1329, -1163,  -629,    -6,   320,     67,  -759, -1803, -2474, -2204,  -739,  1695,
-   4421,  6556,  7363,  6556,  4421,  1695,  -739,  -2204, -2474, -1803,  -759,    67,   320,    -6,
-   -629, -1163, -1329, -1084,  -603,  -165,    12,   -121,  -444,  -743,  -843,  -697,  -396,  -106,
-     26,   -41,  -238,  -429,  -496,  -399,  -194,      7,   106,    67,   -63,  -195,  -245,  -182,
-    -42,    96,   166,   140,    46,   -49,   -90,    -52,    39,   132,   178,   157,    88,    16,
-    -17,     2,    60,   120,   147,   130,    80,     28,     0,     9,    44,    81,    98,    85,
-     50,    14,    -5,    -1,    19,    41,    51,     43,    21,    -1,   -14,   -12,     0,    14,
-     21,    16,     3,    -9,   -17,   -15,    -7,      1,     6,     4,    -2,   -11,   -16,   -15,
-     -9,    -2,     1,     0,    -4};
+     26,     19,      6,     -7,    -13,     -7,      8,     27,     35,     22,    -10,    -48,    -70,    -60,    -21,     24,
+     41,      3,    -84,   -185,   -243,   -222,   -129,    -23,     15,    -66,   -257,   -471,   -591,   -539,   -332,    -94,
+      9,   -134,   -503,   -926,  -1160,  -1035,   -570,     -5,    300,     64,   -728,  -1747,  -2418,  -2171,   -732,   1688,
+   4417,   6564,   7376,   6564,   4417,   1688,   -732,  -2171,  -2418,  -1747,   -728,     64,    300,     -5,   -570,  -1035,
+  -1160,   -926,   -503,   -134,      9,    -94,   -332,   -539,   -591,   -471,   -257,    -66,     15,    -23,   -129,   -222,
+   -243,   -185,    -84,      3,     41,     24,    -21,    -60,    -70,    -48,    -10,     22,     35,     27,      8,     -7,
+    -13,     -7,      6,     19,     26};
 
-const uint16_t FILTER_COEFFS_LEN = 201U;
+const uint16_t FILTER_COEFFS_LEN = 101U;
 
 CFM::CFM() :
 m_filter(),
diff --git a/FM.h b/FM.h
index 26d18d7..963f29b 100644
--- a/FM.h
+++ b/FM.h
@@ -53,7 +53,7 @@ public:
 
 private:
   arm_fir_instance_q15 m_filter;
-  q15_t                m_filterState[230U];           // NoTaps + BlockSize - 1, 201 + 20 - 1 plus some spare
+  q15_t                m_filterState[130U];           // NoTaps + BlockSize - 1, 101 + 20 - 1 plus some spare
   CFMKeyer             m_callsign;
   CFMKeyer             m_rfAck;
   CFMCTCSSRX           m_ctcssRX;
diff --git a/FMCTCSSRX.cpp b/FMCTCSSRX.cpp
index 728cc51..d6a529a 100644
--- a/FMCTCSSRX.cpp
+++ b/FMCTCSSRX.cpp
@@ -102,7 +102,7 @@ uint8_t CFMCTCSSRX::setParams(uint8_t frequency, uint8_t threshold)
   if (m_coeff == 0.0F)
     return 4U;
 
-  m_threshold = float32_t(threshold * threshold);
+  m_threshold = float32_t(threshold);
 
   return 0U;
 }
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 45624da..1490c8c 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -101,7 +101,7 @@ const uint8_t MMDVM_DEBUG5       = 0xF5U;
 #define	HW_TYPE	"MMDVM"
 #endif
 
-#define DESCRIPTION "20200418 (D-Star/DMR/System Fusion/P25/NXDN/POCSAG/FM)"
+#define DESCRIPTION "20200420 (D-Star/DMR/System Fusion/P25/NXDN/POCSAG/FM)"
 
 #if defined(GITVERSION)
 #define concat(h, a, b, c) h " " a " " b " GitID #" c ""