diff --git a/CalPOCSAG.cpp b/CalPOCSAG.cpp
new file mode 100644
index 0000000..a449232
--- /dev/null
+++ b/CalPOCSAG.cpp
@@ -0,0 +1,66 @@
+/*
+ *   Copyright (C) 2018 by Florian Wolters DF2ET
+ *
+ *   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
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "Config.h"
+#include "Globals.h"
+#include "CalPOCSAG.h"
+
+// POCSAG 600 Hz Test Pattern
+
+CCalPOCSAG::CCalPOCSAG() :
+m_transmit(false),
+m_state(POCSAGCAL_IDLE),
+m_audioSeq(0U)
+{
+}
+
+void CCalPOCSAG::process()
+{
+  pocsagTX.process();
+
+  uint16_t space = pocsagTX.getSpace();
+  if (space < 1U)
+    return;
+
+  switch (m_state) {
+    case POCSAGCAL_TX:
+      //pocsagTX.writeData(POCSAG_CAL[m_audioSeq], POCSAG_FRAME_LENGTH_BYTES + 1U);
+      m_audioSeq = (m_audioSeq + 1U) % 4U;
+      if(!m_transmit)
+        m_state = POCSAGCAL_IDLE;
+      break;
+    default:
+        m_state = POCSAGCAL_IDLE;
+        m_audioSeq = 0U;
+      break;
+  }
+}
+
+uint8_t CCalPOCSAG::write(const uint8_t* data, uint8_t length)
+{
+  if (length != 1U)
+    return 4U;
+
+  m_transmit = data[0U] == 1U;
+
+  if(m_transmit && m_state == POCSAGCAL_IDLE)
+    m_state = POCSAGCAL_TX;
+
+  return 0U;
+}
+
diff --git a/CalPOCSAG.h b/CalPOCSAG.h
new file mode 100644
index 0000000..7d4abab
--- /dev/null
+++ b/CalPOCSAG.h
@@ -0,0 +1,44 @@
+/*
+ *   Copyright (C) 2019 by Florian Wolters DF2ET
+ *
+ *   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
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(CALPOCSAG_H)
+#define  CALPOCSAG_H
+
+#include "Config.h"
+
+enum POCSAGCAL {
+  POCSAGCAL_IDLE,
+  POCSAGCAL_TX
+};
+
+class CCalPOCSAG {
+public:
+  CCalPOCSAG();
+
+  void process();
+
+  uint8_t write(const uint8_t* data, uint8_t length);
+
+private:
+  bool      m_transmit;
+  POCSAGCAL m_state;
+  uint8_t   m_audioSeq;
+};
+
+#endif
+
diff --git a/Globals.h b/Globals.h
index c082d60..b52074f 100644
--- a/Globals.h
+++ b/Globals.h
@@ -60,7 +60,9 @@ enum MMDVM_STATE {
   STATE_RSSICAL   = 96,
   STATE_CWID      = 97,
   STATE_DMRCAL    = 98,
-  STATE_DSTARCAL  = 99
+  STATE_DSTARCAL  = 99,
+  STATE_INTCAL    = 100,
+  STATE_POCSAGCAL = 101
 };
 
 #include "SerialPort.h"
@@ -83,6 +85,7 @@ enum MMDVM_STATE {
 #include "CalDMR.h"
 #include "CalP25.h"
 #include "CalNXDN.h"
+#include "CalPOCSAG.h"
 #include "CalRSSI.h"
 #include "CWIdTX.h"
 #include "Debug.h"
diff --git a/MMDVM.cpp b/MMDVM.cpp
index 6fd894c..306cdcd 100644
--- a/MMDVM.cpp
+++ b/MMDVM.cpp
@@ -64,6 +64,7 @@ CCalDStarTX calDStarTX;
 CCalDMR     calDMR;
 CCalP25     calP25;
 CCalNXDN    calNXDN;
+CCalPOCSAG  calPOCSAG;
 CCalRSSI    calRSSI;
 
 CCWIdTX cwIdTX;
@@ -117,6 +118,9 @@ void loop()
   if (m_modemState == STATE_NXDNCAL1K)
     calNXDN.process();
 
+  if (m_modemState == STATE_POCSAGCAL)
+    calPOCSAG.process();
+
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }
diff --git a/MMDVM.ino b/MMDVM.ino
index ff392e1..dcb1fcf 100644
--- a/MMDVM.ino
+++ b/MMDVM.ino
@@ -61,6 +61,7 @@ CCalDStarTX calDStarTX;
 CCalDMR     calDMR;
 CCalP25     calP25;
 CCalNXDN    calNXDN;
+CCalPOCSAG  calPOCSAG;
 CCalRSSI    calRSSI;
 
 CCWIdTX cwIdTX;
@@ -114,6 +115,9 @@ void loop()
   if (m_modemState == STATE_NXDNCAL1K)
     calNXDN.process();
 
+  if (m_modemState == STATE_POCSAGCAL)
+    calPOCSAG.process();
+
   if (m_modemState == STATE_IDLE)
     cwIdTX.process();
 }