diff --git a/main.cpp b/main.cpp
index b3de449f6..43543ce59 100644
--- a/main.cpp
+++ b/main.cpp
@@ -373,13 +373,14 @@ int main(int argc, char *argv[])
             }
           if (!mem_jt9.attach ())
             {
-            if (!mem_jt9.create (sizeof (struct dec_data)))
+              if (!mem_jt9.create (sizeof (dec_data)))
               {
                 splash.hide ();
                 MessageBox::critical_message (nullptr, a.translate ("main", "Shared memory error"),
                                               a.translate ("main", "Unable to create shared memory segment"));
                 throw std::runtime_error {"Shared memory error"};
               }
+              qDebug () << "shmem size:" << mem_jt9.size ();
             }
           else
             {
diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index f18b9fd73..3a3bbd1ea 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -1343,13 +1343,15 @@ void MainWindow::fixStop()
   } else if (m_mode=="FT4") {
   m_hsymStop=21;
   } else if(m_mode=="FST240" or m_mode=="FST240W") {
-    int stop[] = {39,85,187,387,1003};
-    int stop_EME[] = {48,95,197,396,1012};
+    int stop[] = {39,85,187,387,1003,3107,6232};
+    int stop_EME[] = {48,95,197,396,1012,3107,6232};
     int i=0;
     if(m_TRperiod==30) i=1;
     if(m_TRperiod==60) i=2;
     if(m_TRperiod==120) i=3;
     if(m_TRperiod==300) i=4;
+    if(m_TRperiod==900) i=5;
+    if(m_TRperiod==1800) i=5;
     if(m_config.decode_at_52s()) {
       m_hsymStop=stop_EME[i];
     } else {