diff --git a/IO.cpp b/IO.cpp
index 8b77f85..ea69377 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -48,6 +48,7 @@ m_dstarTXLevel(128 * 128),
 m_dmrTXLevel(128 * 128),
 m_ysfTXLevel(128 * 128),
 m_p25TXLevel(128 * 128),
+m_txDCOffset(DC_OFFSET),
 m_ledCount(0U),
 m_ledValue(true),
 m_detect(false),
@@ -246,7 +247,7 @@ void CIO::write(MMDVM_STATE mode, q15_t* samples, uint16_t length, const uint8_t
   for (uint16_t i = 0U; i < length; i++) {
     q31_t res1 = samples[i] * txLevel;
     q15_t res2 = q15_t(__SSAT((res1 >> 15), 16));
-    uint16_t res3 = uint16_t(res2 + DC_OFFSET);
+    uint16_t res3 = uint16_t(res2 + m_txDCOffset);
 
     // Detect DAC overflow
     if (res3 > 4095U)
@@ -287,7 +288,7 @@ void CIO::setMode()
 #endif
 }
 
-void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel)
+void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, int16_t txDCOffset)
 {
   m_pttInvert = pttInvert;
 
@@ -297,6 +298,8 @@ void CIO::setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rx
   m_dmrTXLevel   = q15_t(dmrTXLevel * 128);
   m_ysfTXLevel   = q15_t(ysfTXLevel * 128);
   m_p25TXLevel   = q15_t(p25TXLevel * 128);
+
+  m_txDCOffset   = DC_OFFSET + txDCOffset;
   
   if (rxInvert)
     m_rxLevel = -m_rxLevel;
diff --git a/IO.h b/IO.h
index 4c0c727..ba7bbfa 100644
--- a/IO.h
+++ b/IO.h
@@ -42,7 +42,7 @@ public:
   
   void interrupt();
 
-  void setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel);
+  void setParameters(bool rxInvert, bool txInvert, bool pttInvert, uint8_t rxLevel, uint8_t cwIdTXLevel, uint8_t dstarTXLevel, uint8_t dmrTXLevel, uint8_t ysfTXLevel, uint8_t p25TXLevel, int16_t txDCOffset);
 
   void getOverflow(bool& adcOverflow, bool& dacOverflow);
 
@@ -74,6 +74,8 @@ private:
   q15_t                m_ysfTXLevel;
   q15_t                m_p25TXLevel;
 
+  uint16_t             m_txDCOffset;
+
   uint32_t             m_ledCount;
   bool                 m_ledValue;
 
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 3ee2f21..235257d 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -221,7 +221,7 @@ void CSerialPort::getVersion()
 
 uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 {
-  if (length < 13U)
+  if (length < 14U)
     return 4U;
 
   bool rxInvert  = (data[0U] & 0x01U) == 0x01U;
@@ -268,6 +268,8 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   uint8_t ysfTXLevel   = data[11U];
   uint8_t p25TXLevel   = data[12U];
 
+  int16_t txDCOffset = int16_t(data[13U]) - 128;
+
   m_modemState  = modemState;
 
   m_dstarEnable = dstarEnable;
@@ -289,7 +291,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 
   ysfTX.setLoDev(ysfLoDev);
 
-  io.setParameters(rxInvert, txInvert, pttInvert, rxLevel, cwIdTXLevel, dstarTXLevel, dmrTXLevel, ysfTXLevel, p25TXLevel);
+  io.setParameters(rxInvert, txInvert, pttInvert, rxLevel, cwIdTXLevel, dstarTXLevel, dmrTXLevel, ysfTXLevel, p25TXLevel, txDCOffset);
 
   io.start();