diff --git a/src/common/Defines.h b/src/common/Defines.h
index 60040731..9ac96a2b 100644
--- a/src/common/Defines.h
+++ b/src/common/Defines.h
@@ -109,7 +109,7 @@ typedef unsigned long long  ulong64_t;
 #define __PROG_NAME__ ""
 #define __NET_NAME__ "DVM_DMR_P25"
 #define __EXE_NAME__ ""
-#define __VER__ "D03.60.00-alpha (" __GIT_VER__ ")"
+#define __VER__ "D03.60.00 (" __GIT_VER__ ")"
 #define __BUILD__ __DATE__ " " __TIME__
 
 #define HOST_SW_API
diff --git a/src/host/calibrate/HostCal.cpp b/src/host/calibrate/HostCal.cpp
index f2d968f3..0146ea9e 100644
--- a/src/host/calibrate/HostCal.cpp
+++ b/src/host/calibrate/HostCal.cpp
@@ -93,7 +93,7 @@ int HostCal::run(int argc, char **argv)
     ::LogInfo(">> Modem Calibration");
 
     yaml::Node systemConf = m_conf["system"];
-    m_duplex = systemConf["duplex"].as<bool>(true);
+    m_startupDuplex = m_duplex = systemConf["duplex"].as<bool>(true);
 
     // try to load bandplan identity table
     std::string idenLookupFile = systemConf["iden_table"]["file"].as<std::string>();
@@ -428,6 +428,13 @@ int HostCal::run(int argc, char **argv)
         }
         break;
 
+        case ')':
+        {
+            m_duplex = !m_duplex;
+            writeConfig();
+        }
+        break;
+
         /** Mode Commands */
         case 'Z':
         {
@@ -549,7 +556,6 @@ int HostCal::run(int argc, char **argv)
         break;
         case 'B':
         case 'J':
-        case ')':
         {
             m_mode = STATE_DMR;
             if (c == 'J') {
@@ -560,11 +566,8 @@ int HostCal::run(int argc, char **argv)
                 m_modeStr = DMR_FEC_STR;
                 m_dmrRx1K = false;
             }
-            if (c == ')') {
-                m_duplex = true;
-            } else {
-                m_duplex = false;
-            }
+
+            m_duplex = m_startupDuplex;
             m_dmrEnabled = true;
             m_p25Enabled = false;
             m_nxdnEnabled = false;
@@ -585,7 +588,8 @@ int HostCal::run(int argc, char **argv)
                 m_modeStr = P25_FEC_STR;
                 m_p25Rx1K = false;
             }
-            m_duplex = false;
+
+            m_duplex = m_startupDuplex;
             m_dmrEnabled = false;
             m_p25Enabled = true;
             m_p25TduTest = false;
@@ -601,7 +605,8 @@ int HostCal::run(int argc, char **argv)
             if (m_modem->getVersion() >= 3U) {
                 m_mode = STATE_NXDN;
                 m_modeStr = NXDN_FEC_STR;
-                m_duplex = false;
+
+                m_duplex = m_startupDuplex;
                 m_dmrEnabled = false;
                 m_p25Enabled = false;
                 m_p25Rx1K = false;
@@ -620,6 +625,7 @@ int HostCal::run(int argc, char **argv)
         {
             m_mode = STATE_RSSI_CAL;
             m_modeStr = RSSI_CAL_STR;
+
             m_duplex = true;
             m_dmrEnabled = false;
             m_dmrRx1K = false;
@@ -720,6 +726,7 @@ void HostCal::displayHelp()
     if (!m_modem->m_flashDisabled) {
         LogMessage(LOG_CAL, "    U        Read modem configuration area and reset local configuration");
     }
+    LogMessage(LOG_CAL, "    )        Swap Duplex Flag (depending on mode this will enable/disable duplex)");
     LogMessage(LOG_CAL, "    Q/q      Quit");
     LogMessage(LOG_CAL, "Level Adjustment Commands:");
     if (!m_isHotspot) {
diff --git a/src/host/setup/HostSetup.cpp b/src/host/setup/HostSetup.cpp
index b84edd09..1233c3d4 100644
--- a/src/host/setup/HostSetup.cpp
+++ b/src/host/setup/HostSetup.cpp
@@ -66,21 +66,21 @@ using namespace lookups;
 
 // Voice LC MS Header, CC: 1, srcID: 1, dstID: TG9
 const uint8_t VH_DMO1K[] = {
-        0x00U, 0x20U, 0x08U, 0x08U, 0x02U, 0x38U, 0x15U, 0x00U, 0x2CU, 0xA0U, 0x14U,
-        0x60U, 0x84U, 0x6DU, 0x5DU, 0x7FU, 0x77U, 0xFDU, 0x75U, 0x7EU, 0x30U, 0x30U,
-        0x01U, 0x10U, 0x01U, 0x40U, 0x03U, 0xC0U, 0x13U, 0xC1U, 0x1EU, 0x80U, 0x6FU };
+    0x00U, 0x20U, 0x08U, 0x08U, 0x02U, 0x38U, 0x15U, 0x00U, 0x2CU, 0xA0U, 0x14U,
+    0x60U, 0x84U, 0x6DU, 0x5DU, 0x7FU, 0x77U, 0xFDU, 0x75U, 0x7EU, 0x30U, 0x30U,
+    0x01U, 0x10U, 0x01U, 0x40U, 0x03U, 0xC0U, 0x13U, 0xC1U, 0x1EU, 0x80U, 0x6FU };
 
 // Voice Term MS with LC, CC: 1, srcID: 1, dstID: TG9
 const uint8_t VT_DMO1K[] = {
-        0x00U, 0x4FU, 0x08U, 0xDCU, 0x02U, 0x88U, 0x15U, 0x78U, 0x2CU, 0xD0U, 0x14U,
-        0xC0U, 0x84U, 0xADU, 0x5DU, 0x7FU, 0x77U, 0xFDU, 0x75U, 0x79U, 0x65U, 0x24U,
-        0x02U, 0x28U, 0x06U, 0x20U, 0x0FU, 0x80U, 0x1BU, 0xC1U, 0x07U, 0x80U, 0x5CU };
+    0x00U, 0x4FU, 0x08U, 0xDCU, 0x02U, 0x88U, 0x15U, 0x78U, 0x2CU, 0xD0U, 0x14U,
+    0xC0U, 0x84U, 0xADU, 0x5DU, 0x7FU, 0x77U, 0xFDU, 0x75U, 0x79U, 0x65U, 0x24U,
+    0x02U, 0x28U, 0x06U, 0x20U, 0x0FU, 0x80U, 0x1BU, 0xC1U, 0x07U, 0x80U, 0x5CU };
 
 // Voice coding data + FEC, 1031 Hz Test Pattern
 const uint8_t VOICE_1K[] = {
-        0xCEU, 0xA8U, 0xFEU, 0x83U, 0xACU, 0xC4U, 0x58U, 0x20U, 0x0AU, 0xCEU, 0xA8U,
-        0xFEU, 0x83U, 0xA0U, 0x00U, 0x00U, 0x00U, 0x00U, 0x00U, 0x0CU, 0xC4U, 0x58U,
-        0x20U, 0x0AU, 0xCEU, 0xA8U, 0xFEU, 0x83U, 0xACU, 0xC4U, 0x58U, 0x20U, 0x0AU };
+    0xCEU, 0xA8U, 0xFEU, 0x83U, 0xACU, 0xC4U, 0x58U, 0x20U, 0x0AU, 0xCEU, 0xA8U,
+    0xFEU, 0x83U, 0xA0U, 0x00U, 0x00U, 0x00U, 0x00U, 0x00U, 0x0CU, 0xC4U, 0x58U,
+    0x20U, 0x0AU, 0xCEU, 0xA8U, 0xFEU, 0x83U, 0xACU, 0xC4U, 0x58U, 0x20U, 0x0AU };
 
 // Recommended 1011 Hz test pattern for P25 Phase 1 (ANSI/TIA-102.CAAA)
 // NAC: 0x293, srcID: 1, dstID: TG1
@@ -211,8 +211,7 @@ int HostSetup::run(int argc, char** argv)
     yaml::Node logConf = m_conf["log"];
     yaml::Node systemConf = m_conf["system"];
     yaml::Node modemConfig = systemConf["modem"];
-    m_duplex = systemConf["duplex"].as<bool>(true);
-    m_startupDuplex = m_duplex;
+    m_startupDuplex = m_duplex = systemConf["duplex"].as<bool>(true);
 
     // try to load bandplan identity table
     std::string idenLookupFile = systemConf["iden_table"]["file"].as<std::string>();
@@ -1508,6 +1507,7 @@ bool HostSetup::writeConfig(uint8_t modeOverride)
         buffer[3U] |= 0x04U;
     if (m_debug)
         buffer[3U] |= 0x10U;
+    buffer[3U] |= 0x40U; // force DMO for calibration
     if (!m_duplex)
         buffer[3U] |= 0x80U;
 
diff --git a/src/host/setup/SetupMainWnd.h b/src/host/setup/SetupMainWnd.h
index 3db87ea5..b4fc39d6 100644
--- a/src/host/setup/SetupMainWnd.h
+++ b/src/host/setup/SetupMainWnd.h
@@ -121,6 +121,7 @@ public:
         // calibrate menu
         m_calibrateMenuSeparator1.setSeparator();
         m_calibrateMenuSeparator2.setSeparator();
+        m_calibrateMenuSeparator3.setSeparator();
         m_dmrCal.addCallback("toggled", [&]() {
             m_setup->m_mode = STATE_DMR_CAL;
             m_setup->m_modeStr = DMR_CAL_STR;
@@ -132,6 +133,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -148,6 +150,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -164,6 +167,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -180,6 +184,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -196,6 +201,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -212,6 +218,7 @@ public:
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -226,6 +233,7 @@ public:
             m_setup->m_p25TduTest = true;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd();
 
             m_setup->m_queue.clear();
@@ -246,6 +254,7 @@ public:
                 m_setup->m_p25TduTest = false;
                 m_setup->m_nxdnEnabled = false;
 
+                updateDuplexState();
                 resetBERWnd();
 
                 LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -259,18 +268,12 @@ public:
             m_setup->m_mode = STATE_DMR;
             m_setup->m_modeStr = DMR_FEC_STR;
             m_setup->m_dmrRx1K = false;
-/*
-            if (c == ')') {
-                m_setup->m_duplex = true;
-            } else {
-                m_setup->m_duplex = false;
-            }
-*/
-            m_setup->m_duplex = false;
+            m_setup->m_duplex = m_setup->m_startupDuplex;
             m_setup->m_dmrEnabled = true;
             m_setup->m_p25Enabled = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd(true);
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -280,18 +283,12 @@ public:
             m_setup->m_mode = STATE_DMR;
             m_setup->m_modeStr = DMR_FEC_1K_STR;
             m_setup->m_dmrRx1K = true;
-/*
-            if (c == ')') {
-                m_setup->m_duplex = true;
-            } else {
-                m_setup->m_duplex = false;
-            }
-*/
-            m_setup->m_duplex = false;
+            m_setup->m_duplex = m_setup->m_startupDuplex;
             m_setup->m_dmrEnabled = true;
             m_setup->m_p25Enabled = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd(true);
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -301,12 +298,13 @@ public:
             m_setup->m_mode = STATE_P25;
             m_setup->m_modeStr = P25_FEC_STR;
             m_setup->m_p25Rx1K = false;
-            m_setup->m_duplex = false;
+            m_setup->m_duplex = m_setup->m_startupDuplex;
             m_setup->m_dmrEnabled = false;
             m_setup->m_p25Enabled = true;
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd(true);
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -316,12 +314,13 @@ public:
             m_setup->m_mode = STATE_P25;
             m_setup->m_modeStr = P25_FEC_1K_STR;
             m_setup->m_p25Rx1K = true;
-            m_setup->m_duplex = false;
+            m_setup->m_duplex = m_setup->m_startupDuplex;
             m_setup->m_dmrEnabled = false;
             m_setup->m_p25Enabled = true;
             m_setup->m_p25TduTest = false;
             m_setup->m_nxdnEnabled = false;
 
+            updateDuplexState();
             resetBERWnd(true);
 
             LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -332,13 +331,14 @@ public:
             if (m_setup->m_modem->getVersion() >= 3U) {
                 m_setup->m_mode = STATE_NXDN;
                 m_setup->m_modeStr = NXDN_FEC_STR;
-                m_setup->m_duplex = false;
+                m_setup->m_duplex = m_setup->m_startupDuplex;
                 m_setup->m_dmrEnabled = false;
                 m_setup->m_p25Enabled = false;
                 m_setup->m_p25Rx1K = false;
                 m_setup->m_p25TduTest = false;
                 m_setup->m_nxdnEnabled = true;
 
+                updateDuplexState();
                 resetBERWnd(true);
 
                 LogMessage(LOG_CAL, " - %s", m_setup->m_modeStr.c_str());
@@ -392,6 +392,13 @@ public:
                 m_setup->writeConfig();
             }
         });
+        m_toggleDuplex.addCallback("toggled", this, [&]() {
+            if (m_setup->m_isHotspot && m_setup->m_isConnected) {
+                m_setup->m_duplex = !m_setup->m_duplex;
+                LogMessage(LOG_CAL, "Hotspot Rx: %s", m_setup->m_duplex ? "Rx Antenna" : "Tx Antenna");
+                m_setup->writeConfig();
+            }
+        });
 
         m_adjustLevel.addAccelerator(FKey::Meta_l); // Meta/Alt + L
         m_adjustLevel.addCallback("clicked", this, [&]() {
@@ -472,7 +479,7 @@ public:
             const FString line(2, UniChar::BoxDrawingsHorizontal);
             FMessageBox info("About", line + __PROG_NAME__ + line + L"\n\n"
                 L"Version " + __VER__ + L"\n\n"
-                L"Copyright (c) 2017-2023 Bryan Biedenkapp, N2PLL and DVMProject (https://github.com/dvmproject) Authors." + L"\n"
+                L"Copyright (c) 2017-2024 Bryan Biedenkapp, N2PLL and DVMProject (https://github.com/dvmproject) Authors." + L"\n"
                 L"Portions Copyright (c) 2015-2021 by Jonathan Naylor, G4KLX and others", 
                 FMessageBox::ButtonType::Ok, FMessageBox::ButtonType::Reject, FMessageBox::ButtonType::Reject, this);
             info.setCenterText();
@@ -506,9 +513,20 @@ public:
             m_toggleDCBlocker.setChecked();
         }
 
+        updateDuplexState();
         updateMenuStates();
     }
 
+    /// <summary>
+    /// Helper to update duplex toggle menu state.
+    /// </summary>
+    void updateDuplexState()
+    {
+        if (m_setup->m_duplex) {
+            m_toggleDuplex.setChecked();
+        }
+    }
+
     /// <summary>
     /// Helper to update menu states.
     /// </summary>
@@ -530,6 +548,8 @@ public:
                 m_togglePTTInvert.setDisable();
                 m_toggleDCBlocker.setDisable();
 
+                m_toggleDuplex.setEnable();
+
                 m_adjSymLevel.setDisable();
                 m_adjHSBandwidth.setEnable();
                 m_adjHSGain.setEnable();
@@ -540,6 +560,8 @@ public:
                 m_togglePTTInvert.setEnable();
                 m_toggleDCBlocker.setEnable();
 
+                m_toggleDuplex.setDisable();
+
                 m_adjSymLevel.setEnable();
                 m_adjHSBandwidth.setDisable();
                 m_adjHSGain.setDisable();
@@ -601,6 +623,8 @@ private:
     FCheckMenuItem m_togglePTTInvert{"PTT Invert", &m_calibrateMenu};
     FCheckMenuItem m_toggleDCBlocker{"DC Blocker", &m_calibrateMenu};
     FMenuItem m_calibrateMenuSeparator2{&m_calibrateMenu};
+    FCheckMenuItem m_toggleDuplex{"Rx on Hotspot Rx Antenna", &m_calibrateMenu};
+    FMenuItem m_calibrateMenuSeparator3{&m_calibrateMenu};
     FMenuItem m_adjustLevel{"&Level Adjustment", &m_calibrateMenu};
 
     FMenu m_engineeringMenu{"&Engineering", &m_menuBar};
@@ -678,6 +702,14 @@ private:
     void cb_connectToModemClick()
     {
         if (!m_setup->m_isConnected) {
+            bool modemDebugState = g_modemDebug;
+            if (g_modemDebug) {
+                g_modemDebug = false;
+            }
+
+            m_setup->m_debug = false;
+            m_setup->m_modem->m_debug = false;
+
             FMessageBox wait("Wait", L"Please wait...\nConnecting to modem...",
                 FMessageBox::ButtonType::Reject, FMessageBox::ButtonType::Reject, FMessageBox::ButtonType::Reject, this);
             wait.setCenterText();
@@ -727,6 +759,13 @@ private:
                 return;
             }
 
+            if (g_modemDebug != modemDebugState) {
+                g_modemDebug = modemDebugState;
+                m_setup->m_debug = g_modemDebug;
+                m_setup->m_modem->m_debug = g_modemDebug;
+                m_setup->writeConfig();
+            }
+
             m_setup->m_isConnected = true;
             m_connectToModemItem.setDisable();