diff --git a/DMRDefines.h b/DMRDefines.h
index 5335a03..1bbeff0 100644
--- a/DMRDefines.h
+++ b/DMRDefines.h
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2016 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2009-2017 by Jonathan Naylor G4KLX
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -19,7 +19,7 @@
 #if !defined(DMRDEFINES_H)
 #define  DMRDEFINES_H
 
-const unsigned int DMR_RADIO_SYMBOL_LENGTH = 5U;      // At 24 kHz sample rate
+const unsigned int DMR_RADIO_SYMBOL_LENGTH = 10U;      // At 48 kHz sample rate
 
 const unsigned int DMR_FRAME_LENGTH_BYTES   = 33U;
 const unsigned int DMR_FRAME_LENGTH_BITS    = DMR_FRAME_LENGTH_BYTES * 8U;
diff --git a/DStarDefines.h b/DStarDefines.h
index 2983c9e..0d5637d 100644
--- a/DStarDefines.h
+++ b/DStarDefines.h
@@ -19,7 +19,7 @@
 #if !defined(DSTARDEFINES_H)
 #define  DSTARDEFINES_H
 
-const unsigned int DSTAR_RADIO_SYMBOL_LENGTH = 5U;      // At 24 kHz sample rate
+const unsigned int DSTAR_RADIO_SYMBOL_LENGTH = 10U;      // At 48 kHz sample rate
 
 const unsigned int DSTAR_HEADER_LENGTH_BYTES   = 41U;
 
diff --git a/IO.cpp b/IO.cpp
index 64a7e23..ae18e90 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -27,8 +27,8 @@ static q31_t   DC_FILTER[] = {3367972, 0, 3367972, 0, 2140747704, 0}; // {b0, 0,
 const uint32_t DC_FILTER_STAGES = 1U; // One Biquad stage
 
 // One symbol boxcar filter
-static q15_t   BOXCAR_FILTER[] = {12000, 12000, 12000, 12000, 12000, 0};
-const uint16_t BOXCAR_FILTER_LEN = 6U;
+static q15_t   BOXCAR_FILTER[] = {6000, 6000, 6000, 6000, 6000, 6000, 6000, 6000, 6000, 6000, 0, 0};
+const uint16_t BOXCAR_FILTER_LEN = 12U;
 
 const uint16_t DC_OFFSET = 2048U;
 
diff --git a/P25Defines.h b/P25Defines.h
index 9aede9e..2bfd73d 100644
--- a/P25Defines.h
+++ b/P25Defines.h
@@ -19,7 +19,7 @@
 #if !defined(P25DEFINES_H)
 #define  P25DEFINES_H
 
-const unsigned int P25_RADIO_SYMBOL_LENGTH = 5U;      // At 24 kHz sample rate
+const unsigned int P25_RADIO_SYMBOL_LENGTH = 10U;      // At 48 kHz sample rate
 
 const unsigned int P25_HDR_FRAME_LENGTH_BYTES      = 99U;
 const unsigned int P25_HDR_FRAME_LENGTH_BITS       = P25_HDR_FRAME_LENGTH_BYTES * 8U;
diff --git a/TODO.txt b/TODO.txt
new file mode 100644
index 0000000..5c4971e
--- /dev/null
+++ b/TODO.txt
@@ -0,0 +1,40 @@
+Jobs To Do
+----------
+
+1.  DC Offset coefficients
+2.  TX Filters:
+	 D-Star
+	 DMR
+	 YSF
+	 P25
+3.  TX Filter workspaces and clearing:
+	 D-Star
+	 DMR
+	 YSF
+	 P25
+4.  CW Id sine wave, silence and construction
+5.  RX Filters
+6.  RX Filter workspaces and clearing:
+	 D-Star
+	 DMR
+	 YSF
+	 P25
+7.  Sample ring buffer sizing
+	 RX
+	 TX
+8.  TX symbols.
+9.  DC Offset workspace and clearing.
+10. Hardware sample rates:
+	 Due
+	 STM32
+	 Teensy
+
+Jobs Done
+---------
+
+1.  Boxcar coefficients
+2.  Symbols lengths for:
+	 D-Star
+	 DMR
+	 YSF
+	 P25
diff --git a/YSFDefines.h b/YSFDefines.h
index c05f426..4dc73b6 100644
--- a/YSFDefines.h
+++ b/YSFDefines.h
@@ -19,7 +19,7 @@
 #if !defined(YSFDEFINES_H)
 #define  YSFDEFINES_H
 
-const unsigned int YSF_RADIO_SYMBOL_LENGTH = 5U;      // At 24 kHz sample rate
+const unsigned int YSF_RADIO_SYMBOL_LENGTH = 10U;      // At 48 kHz sample rate
 
 const unsigned int YSF_FRAME_LENGTH_BYTES   = 120U;
 const unsigned int YSF_FRAME_LENGTH_BITS    = YSF_FRAME_LENGTH_BYTES * 8U;