diff --git a/plugins/feature/simpleptt/simplepttgui.cpp b/plugins/feature/simpleptt/simplepttgui.cpp
index 51569ac49..c5ada8a9a 100644
--- a/plugins/feature/simpleptt/simplepttgui.cpp
+++ b/plugins/feature/simpleptt/simplepttgui.cpp
@@ -288,6 +288,8 @@ void SimplePTTGUI::updateDeviceSetLists()
 
     ui->rxDevice->clear();
     ui->txDevice->clear();
+    ui->rxDevice->addItem(tr("None"), -1);
+    ui->txDevice->addItem(tr("None"), -1);
     unsigned int deviceIndex = 0;
     unsigned int rxIndex = 0;
     unsigned int txIndex = 0;
@@ -296,6 +298,7 @@ void SimplePTTGUI::updateDeviceSetLists()
     {
         DSPDeviceSourceEngine *deviceSourceEngine =  (*it)->m_deviceSourceEngine;
         DSPDeviceSinkEngine *deviceSinkEngine = (*it)->m_deviceSinkEngine;
+        DSPDeviceMIMOEngine *deviceMIMOEngine = (*it)->m_deviceMIMOEngine;
 
         if (deviceSourceEngine)
         {
@@ -307,6 +310,14 @@ void SimplePTTGUI::updateDeviceSetLists()
             ui->txDevice->addItem(QString("T%1").arg(deviceIndex), deviceIndex);
             txIndex++;
         }
+        else if (deviceMIMOEngine)
+        {
+            QString text = QString("M%1").arg(deviceIndex);
+            ui->rxDevice->addItem(text, deviceIndex);
+            ui->txDevice->addItem(text, deviceIndex);
+            rxIndex++;
+            txIndex++;
+        }
     }
 
     int rxDeviceIndex;
@@ -314,11 +325,8 @@ void SimplePTTGUI::updateDeviceSetLists()
 
     if (rxIndex > 0)
     {
-        if (m_settings.m_rxDeviceSetIndex < 0) {
-            ui->rxDevice->setCurrentIndex(0);
-        } else {
-            ui->rxDevice->setCurrentIndex(m_settings.m_rxDeviceSetIndex);
-        }
+        int index = ui->rxDevice->findData(m_settings.m_rxDeviceSetIndex);
+        ui->rxDevice->setCurrentIndex(index == -1 ? 0 : index);
 
         rxDeviceIndex = ui->rxDevice->currentData().toInt();
     }
@@ -330,11 +338,8 @@ void SimplePTTGUI::updateDeviceSetLists()
 
     if (txIndex > 0)
     {
-        if (m_settings.m_txDeviceSetIndex < 0) {
-            ui->txDevice->setCurrentIndex(0);
-        } else {
-            ui->txDevice->setCurrentIndex(m_settings.m_txDeviceSetIndex);
-        }
+        int index = ui->txDevice->findData(m_settings.m_txDeviceSetIndex);
+        ui->txDevice->setCurrentIndex(index == -1 ? 0 : index);
 
         txDeviceIndex = ui->txDevice->currentData().toInt();
     }
@@ -425,7 +430,7 @@ void SimplePTTGUI::on_rxDevice_currentIndexChanged(int index)
 {
     if (index >= 0)
     {
-        m_settings.m_rxDeviceSetIndex = index;
+        m_settings.m_rxDeviceSetIndex = ui->rxDevice->currentData().toInt();
         m_settingsKeys.append("rxDeviceSetIndex");
         applySettings();
     }
@@ -435,7 +440,7 @@ void SimplePTTGUI::on_txDevice_currentIndexChanged(int index)
 {
     if (index >= 0)
     {
-        m_settings.m_txDeviceSetIndex = index;
+        m_settings.m_txDeviceSetIndex = ui->txDevice->currentData().toInt();
         m_settingsKeys.append("txDeviceSetIndex");
         applySettings();
     }
diff --git a/plugins/feature/simpleptt/simplepttworker.cpp b/plugins/feature/simpleptt/simplepttworker.cpp
index 311b9b0f4..5814bd272 100644
--- a/plugins/feature/simpleptt/simplepttworker.cpp
+++ b/plugins/feature/simpleptt/simplepttworker.cpp
@@ -23,6 +23,7 @@
 #include "SWGSuccessResponse.h"
 #include "SWGErrorResponse.h"
 
+#include "maincore.h"
 #include "webapi/webapiadapterinterface.h"
 #include "audio/audiodevicemanager.h"
 #include "dsp/dspengine.h"
@@ -242,13 +243,31 @@ bool SimplePTTWorker::turnDevice(bool on)
     SWGSDRangel::SWGDeviceState response;
     SWGSDRangel::SWGErrorResponse error;
     int httpCode;
-
+    unsigned int deviceSetIndex = m_tx ? m_settings.m_txDeviceSetIndex : m_settings.m_rxDeviceSetIndex;
+    MainCore *mainCore = MainCore::instance();
+    auto deviceSets = mainCore->getDeviceSets();
+    if (deviceSetIndex >= deviceSets.size()) 
+    {
+        qWarning("SimplePTTWorker::turnDevice: deviceSetIndex out of range");
+        return false;
+    }
+    bool isDeviceMIMO = mainCore->getDeviceSetTypeId(deviceSets[deviceSetIndex]) == 'M';
     if (on) {
-        httpCode = m_webAPIAdapterInterface->devicesetDeviceRunPost(
-            m_tx ? m_settings.m_txDeviceSetIndex : m_settings.m_rxDeviceSetIndex, response, error);
+        if (isDeviceMIMO) {
+            httpCode = m_webAPIAdapterInterface->devicesetDeviceSubsystemRunPost(
+                deviceSetIndex, m_tx ? 1 : 0, response, error);
+        } else {
+            httpCode = m_webAPIAdapterInterface->devicesetDeviceRunPost(
+                deviceSetIndex, response, error);
+        }
     } else {
-        httpCode = m_webAPIAdapterInterface->devicesetDeviceRunDelete(
-            m_tx ? m_settings.m_txDeviceSetIndex : m_settings.m_rxDeviceSetIndex, response, error);
+        if (isDeviceMIMO) {
+            httpCode = m_webAPIAdapterInterface->devicesetDeviceSubsystemRunDelete(
+                deviceSetIndex, m_tx ? 1 : 0, response, error);
+        } else {
+            httpCode = m_webAPIAdapterInterface->devicesetDeviceRunDelete(
+                deviceSetIndex, response, error);
+        }
     }
 
     if (httpCode/100 == 2)