diff --git a/Source/Transmitter.cpp b/Source/Transmitter.cpp
index a0b2d7d..2ff9798 100644
--- a/Source/Transmitter.cpp
+++ b/Source/Transmitter.cpp
@@ -1,5 +1,5 @@
 #include "Transmitter.hpp"
-
+#include <cpp/radio/DeSymbolizer.hpp>
 
 Transmitter::Transmitter(void)
 	: Thread("Transmitter")
@@ -116,11 +116,38 @@ void Transmitter::paramChanged()
 	m_firUp.init(m_upsampleFactor, m_pCoeffRCF, n_mf);
 	m_duc.init(m_carrierFreq/m_samplerate, 0);
 
-	symbol_t sync_syms[4]; // 4 Corners
-	sync_syms[0] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(+1,+1)));
-	sync_syms[1] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(-1,+1)));
-	sync_syms[2] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(-1,-1)));
-	sync_syms[3] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(+1,-1)));
+	/****************************************************************/
+	/* Setup AGC sync
+	/****************************************************************/
+	const size_t NUM_SYNC_SYMS = 5;
+	symbol_t sync_syms[NUM_SYNC_SYMS]; // 4 Corners
+	size_t i=0;
+	sync_syms[i++] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(+1,-1)));
+	sync_syms[i++] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(+1,+1)));
+	sync_syms[i++] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(-1,+1)));
+	sync_syms[i++] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(-1,-1)));
+	sync_syms[i++] = SymMapDemap(&m_symbolMapper, toCpx(ComplexScalar(+1,-1)));
+
+	for (i=0; i < NUM_SYNC_SYMS; i++)
+	{
+		sync_syms[i] = m_symbolizer.differentialEncode(sync_syms[i]);
+	}
+
+	DeSymbolizer desym;
+	sync_t sync;
+
+	memset(sync.data, 0, sizeof(sync.data));
+
+	desym.setNumBitsPerSymbol(m_numBitPerSymbol);
+	size_t total = 0;
+	for (size_t i=0; i < NUM_SYNC_SYMS; i++)
+	{
+		size_t written = desym.sym2bytes(sync_syms[i], &sync.data[total]);
+		total += written;
+	}
+
+	m_formatter.setSyncData(sync);
+	/****************************************************************/
 }
 
 void Transmitter::bufferResize(uint32_t size)