diff --git a/Conf.cpp b/Conf.cpp
index a8201b8..94fd7bd 100644
--- a/Conf.cpp
+++ b/Conf.cpp
@@ -115,6 +115,7 @@ m_dmrSlot2TGWhiteList(),
 m_dmrCallHang(3U),
 m_dmrTXHang(4U),
 m_fusionEnabled(false),
+m_fusionLowDeviation(false),
 m_fusionRemoteGateway(false),
 m_p25Enabled(false),
 m_p25NAC(0x293U),
@@ -428,6 +429,8 @@ bool CConf::read()
 	} else if (section == SECTION_FUSION) {
 		if (::strcmp(key, "Enable") == 0)
 			m_fusionEnabled = ::atoi(value) == 1;
+		else if (::strcmp(key, "LowDeviation") == 0)
+			m_fusionLowDeviation = ::atoi(value) == 1;
 		else if (::strcmp(key, "RemoteGateway") == 0)
 			m_fusionRemoteGateway = ::atoi(value) == 1;
 	} else if (section == SECTION_P25) {
@@ -867,6 +870,11 @@ bool CConf::getFusionEnabled() const
 	return m_fusionEnabled;
 }
 
+bool CConf::getFusionLowDeviation() const
+{
+	return m_fusionLowDeviation;
+}
+
 bool CConf::getFusionRemoteGateway() const
 {
 	return m_fusionRemoteGateway;
diff --git a/Conf.h b/Conf.h
index 57401e2..f3804e3 100644
--- a/Conf.h
+++ b/Conf.h
@@ -110,6 +110,7 @@ public:
 
   // The System Fusion section
   bool         getFusionEnabled() const;
+  bool         getFusionLowDeviation() const;
   bool         getFusionRemoteGateway() const;
 
   // The P25 section
@@ -258,6 +259,7 @@ private:
   unsigned int m_dmrTXHang;
 
   bool         m_fusionEnabled;
+  bool         m_fusionLowDeviation;
   bool         m_fusionRemoteGateway;
 
   bool         m_p25Enabled;
diff --git a/MMDVM.ini b/MMDVM.ini
index d7a24fb..08b2dec 100644
--- a/MMDVM.ini
+++ b/MMDVM.ini
@@ -80,6 +80,7 @@ TXHang=4
 
 [System Fusion]
 Enable=1
+LowDeviation=0
 RemoteGateway=0
 
 [P25]
diff --git a/MMDVMHost.cpp b/MMDVMHost.cpp
index ce3e515..7f0c584 100644
--- a/MMDVMHost.cpp
+++ b/MMDVMHost.cpp
@@ -395,12 +395,14 @@ int CMMDVMHost::run()
 
 	CYSFControl* ysf = NULL;
 	if (m_ysfEnabled) {
+		bool lowDeviation  = m_conf.getFusionLowDeviation();
 		bool remoteGateway = m_conf.getFusionRemoteGateway();
 
 		LogInfo("YSF Parameters");
+		LogInfo("    Low Deviation: %s", lowDeviation ? "yes" : "no");
 		LogInfo("    Remote Gateway: %s", remoteGateway ? "yes" : "no");
 
-		ysf = new CYSFControl(m_callsign, m_ysfNetwork, m_display, m_timeout, m_duplex, remoteGateway, rssi);
+		ysf = new CYSFControl(m_callsign, m_ysfNetwork, m_display, m_timeout, m_duplex, lowDeviation, remoteGateway, rssi);
 	}
 
 	CP25Control* p25 = NULL;
@@ -800,6 +802,7 @@ bool CMMDVMHost::createModem()
 	unsigned int p25TXLevel   = m_conf.getModemP25TXLevel();
 	bool debug                = m_conf.getModemDebug();
 	unsigned int colorCode    = m_conf.getDMRColorCode();
+	bool lowDeviation         = m_conf.getFusionLowDeviation();
 	unsigned int rxFrequency  = m_conf.getRxFrequency();
 	unsigned int txFrequency  = m_conf.getTxFrequency();
 	std::string samplesDir    = m_conf.getModemSamplesDir();
@@ -825,6 +828,7 @@ bool CMMDVMHost::createModem()
 	m_modem->setLevels(rxLevel, cwIdTXLevel, dstarTXLevel, dmrTXLevel, ysfTXLevel, p25TXLevel);
 	m_modem->setRFParams(rxFrequency, txFrequency);
 	m_modem->setDMRParams(colorCode);
+	m_modem->setYSFParams(lowDeviation);
 
 	bool ret = m_modem->open();
 	if (!ret) {
diff --git a/Modem.cpp b/Modem.cpp
index 0c818a6..db38322 100644
--- a/Modem.cpp
+++ b/Modem.cpp
@@ -87,7 +87,8 @@ const unsigned int BUFFER_LENGTH = 2000U;
 
 CModem::CModem(const std::string& port, bool duplex, bool rxInvert, bool txInvert, bool pttInvert, unsigned int txDelay, unsigned int dmrDelay, const std::string& samplesDir, bool debug) :
 m_port(port),
-m_colorCode(0U),
+m_dmrColorCode(0U),
+m_ysfLoDev(false),
 m_duplex(duplex),
 m_rxInvert(rxInvert),
 m_txInvert(txInvert),
@@ -174,7 +175,12 @@ void CModem::setDMRParams(unsigned int colorCode)
 {
 	assert(colorCode < 16U);
 
-	m_colorCode = colorCode;
+	m_dmrColorCode = colorCode;
+}
+
+void CModem::setYSFParams(bool loDev)
+{
+	m_ysfLoDev = loDev;
 }
 
 bool CModem::open()
@@ -954,6 +960,8 @@ bool CModem::setConfig()
 		buffer[3U] |= 0x02U;
 	if (m_pttInvert)
 		buffer[3U] |= 0x04U;
+	if (m_ysfLoDev)
+		buffer[3U] |= 0x08U;
 	if (!m_duplex)
 		buffer[3U] |= 0x80U;
 
@@ -975,7 +983,7 @@ bool CModem::setConfig()
 
 	buffer[8U] = (m_cwIdTXLevel * 255U) / 100U;
 
-	buffer[9U] = m_colorCode;
+	buffer[9U] = m_dmrColorCode;
 
 	buffer[10U] = m_dmrDelay;
 
diff --git a/Modem.h b/Modem.h
index 1ab6b38..d38e1f7 100644
--- a/Modem.h
+++ b/Modem.h
@@ -41,6 +41,7 @@ public:
 	void setModeParams(bool dstarEnabled, bool dmrEnabled, bool ysfEnabled, bool p25Enabled);
 	void setLevels(unsigned int rxLevel, unsigned int cwIdTXLevel, unsigned int dstarTXLevel, unsigned int dmrTXLevel, unsigned int ysfTXLevel, unsigned int p25Enabled);
 	void setDMRParams(unsigned int colorCode);
+	void setYSFParams(bool loDev);
 
 	bool open();
 
@@ -88,7 +89,8 @@ public:
 
 private:
 	std::string                m_port;
-	unsigned int               m_colorCode;
+	unsigned int               m_dmrColorCode;
+	bool                       m_ysfLoDev;
 	bool                       m_duplex;
 	bool                       m_rxInvert;
 	bool                       m_txInvert;
diff --git a/YSFControl.cpp b/YSFControl.cpp
index 44abb4f..5c999a3 100644
--- a/YSFControl.cpp
+++ b/YSFControl.cpp
@@ -24,11 +24,12 @@
 
 // #define	DUMP_YSF
 
-CYSFControl::CYSFControl(const std::string& callsign, CYSFNetwork* network, CDisplay* display, unsigned int timeout, bool duplex, bool remoteGateway, CRSSIInterpolator* rssiMapper) :
+CYSFControl::CYSFControl(const std::string& callsign, CYSFNetwork* network, CDisplay* display, unsigned int timeout, bool duplex, bool lowDeviation, bool remoteGateway, CRSSIInterpolator* rssiMapper) :
 m_callsign(NULL),
 m_network(network),
 m_display(display),
 m_duplex(duplex),
+m_lowDeviation(lowDeviation),
 m_remoteGateway(remoteGateway),
 m_queue(5000U, "YSF Control"),
 m_rfState(RS_RF_LISTENING),
@@ -217,6 +218,7 @@ bool CYSFControl::writeModem(unsigned char *data, unsigned int len)
 
 		if (m_duplex) {
 			fich.setMR(m_remoteGateway ? YSF_MR_NOT_BUSY : YSF_MR_BUSY);
+			fich.setDev(m_lowDeviation);
 			fich.encode(data + 2U);
 			writeQueueRF(data);
 		}
@@ -242,6 +244,7 @@ bool CYSFControl::writeModem(unsigned char *data, unsigned int len)
 
 		if (m_duplex) {
 			fich.setMR(m_remoteGateway ? YSF_MR_NOT_BUSY : YSF_MR_BUSY);
+			fich.setDev(m_lowDeviation);
 			fich.encode(data + 2U);
 			writeQueueRF(data);
 		}
@@ -351,6 +354,7 @@ bool CYSFControl::writeModem(unsigned char *data, unsigned int len)
 
 		if (m_duplex) {
 			fich.setMR(m_remoteGateway ? YSF_MR_NOT_BUSY : YSF_MR_BUSY);
+			fich.setDev(m_lowDeviation);
 			fich.encode(data + 2U);
 			writeQueueRF(data);
 		}
@@ -523,6 +527,7 @@ void CYSFControl::writeNetwork()
 
 		fich.setVoIP(true);
 		fich.setMR(m_remoteGateway ? YSF_MR_NOT_BUSY : YSF_MR_BUSY);
+		fich.setDev(m_lowDeviation);
 		fich.encode(data + 35U);
 
 		m_lastMode = dt;
diff --git a/YSFControl.h b/YSFControl.h
index bc98146..8d2abc1 100644
--- a/YSFControl.h
+++ b/YSFControl.h
@@ -34,7 +34,7 @@
 
 class CYSFControl {
 public:
-	CYSFControl(const std::string& callsign, CYSFNetwork* network, CDisplay* display, unsigned int timeout, bool duplex, bool remoteGateway, CRSSIInterpolator* rssiMapper);
+	CYSFControl(const std::string& callsign, CYSFNetwork* network, CDisplay* display, unsigned int timeout, bool duplex, bool lowDeviation, bool remoteGateway, CRSSIInterpolator* rssiMapper);
 	~CYSFControl();
 
 	bool writeModem(unsigned char* data, unsigned int len);
@@ -48,6 +48,7 @@ private:
 	CYSFNetwork*               m_network;
 	CDisplay*                  m_display;
 	bool                       m_duplex;
+	bool                       m_lowDeviation;
 	bool                       m_remoteGateway;
 	CRingBuffer<unsigned char> m_queue;
 	RPT_RF_STATE               m_rfState;
diff --git a/YSFFICH.cpp b/YSFFICH.cpp
index 4ed9169..ae4fcce 100644
--- a/YSFFICH.cpp
+++ b/YSFFICH.cpp
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2009-2016 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016,2017 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
@@ -199,6 +199,11 @@ unsigned char CYSFFICH::getMR() const
 	return (m_fich[2U] >> 3) & 0x03U;
 }
 
+bool CYSFFICH::getDev() const
+{
+	return (m_fich[2U] & 0x40U) == 0x40U;
+}
+
 void CYSFFICH::setMR(unsigned char mr)
 {
 	m_fich[2U] &= 0xC7U;
@@ -212,3 +217,11 @@ void CYSFFICH::setVoIP(bool on)
 	else
 		m_fich[2U] &= 0xFBU;
 }
+
+void CYSFFICH::setDev(bool on)
+{
+	if (on)
+		m_fich[2U] |= 0x40U;
+	else
+		m_fich[2U] &= 0xBFU;
+}
diff --git a/YSFFICH.h b/YSFFICH.h
index 8b8d0bd..3837604 100644
--- a/YSFFICH.h
+++ b/YSFFICH.h
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2016,2017 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
@@ -36,9 +36,11 @@ public:
 	unsigned char getFT() const;
 	unsigned char getDT() const;
 	unsigned char getMR() const;
+	bool getDev() const;
 
 	void setMR(unsigned char mr);
 	void setVoIP(bool set);
+	void setDev(bool set);
 
 private:
 	unsigned char* m_fich;