diff --git a/ADF7021.cpp b/ADF7021.cpp
index 1f78a23..4def500 100644
--- a/ADF7021.cpp
+++ b/ADF7021.cpp
@@ -20,7 +20,7 @@
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
- 
+
 #include "Config.h"
 
 #if defined(ENABLE_ADF7021)
@@ -283,7 +283,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
   m_RX_F_divider = floor(divider + 0.5);
 
   ADF7021_RX_REG0  = (uint32_t) 0b0000;
-  
+
 #if defined(BIDIR_DATA_PIN)
   ADF7021_RX_REG0 |= (uint32_t) 0b01001   << 27;   // mux regulator/receive
 #else
@@ -292,7 +292,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
 
   ADF7021_RX_REG0 |= (uint32_t) m_RX_N_divider << 19;   // frequency;
   ADF7021_RX_REG0 |= (uint32_t) m_RX_F_divider << 4;    // frequency;
-  
+
   if( div2 == 1U )
     divider = m_frequency_tx / (ADF7021_PFD / 2U);
   else
@@ -369,7 +369,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
 
       ADF7021_REG3 = ADF7021_REG3_DSTAR;
       ADF7021_REG10 = ADF7021_REG10_DSTAR;
-    
+
       // K=32
       ADF7021_REG4  = (uint32_t) 0b0100                    << 0;   // register 4
       ADF7021_REG4 |= (uint32_t) 0b001                     << 4;   // mode, GMSK
@@ -386,10 +386,10 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
       ADF7021_REG2 |= (uint32_t) (m_dstarDev / div2)       << 19;  // deviation
       ADF7021_REG2 |= (uint32_t) 0b001                     << 4;   // modulation (GMSK)
       break;
-      
+
     case STATE_DMR:
       // Dev: +1 symb 648 Hz, symb rate = 4800
-    
+
       ADF7021_REG3 = ADF7021_REG3_DMR;
       ADF7021_REG10 = ADF7021_REG10_DMR;
 
@@ -413,7 +413,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
 #endif
       break;
-      
+
     case STATE_YSF:
       // Dev: +1 symb 900 Hz, symb rate = 4800
 
@@ -440,7 +440,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
 #endif
       break;
-      
+
     case STATE_P25:
       // Dev: +1 symb 600 Hz, symb rate = 4800
 
@@ -467,7 +467,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
 #endif
       break;
-      
+
     case STATE_NXDN:
       // Dev: +1 symb 350 Hz, symb rate = 2400
 
@@ -494,7 +494,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
 #endif
       break;
-      
+
     default:
       break;
   }
@@ -531,7 +531,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
   ADF7021_REG2 |= (uint32_t) 0b110001      << 7;   // PA  
   AD7021_control_word = ADF7021_REG2;
   Send_AD7021_control();
- 
+
   // TEST DAC (14)
 #if defined(TEST_DAC)
   AD7021_control_word = 0x0000001E;
@@ -567,7 +567,7 @@ void CIO::ifConf(MMDVM_STATE modemState, bool reset)
   // 3FSK/4FSK DEMOD (13)
   AD7021_control_word = ADF7021_REG13;
   Send_AD7021_control();
-  
+
 #if defined(TEST_TX)
   PTT_pin(HIGH); 
   AD7021_control_word = ADF7021_TX_REG0;
@@ -607,7 +607,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
 
       ADF7021_REG3 = ADF7021_REG3_DSTAR;
       ADF7021_REG10 = ADF7021_REG10_DSTAR;
-    
+
       // K=32
       ADF7021_REG4  = (uint32_t) 0b0100                    << 0;   // register 4
       ADF7021_REG4 |= (uint32_t) 0b001                     << 4;   // mode, GMSK
@@ -624,10 +624,10 @@ void CIO::ifConf2(MMDVM_STATE modemState)
       ADF7021_REG2 |= (uint32_t) (m_dstarDev / div2)<< 19;  // deviation
       ADF7021_REG2 |= (uint32_t) 0b001                     << 4;   // modulation (GMSK)
       break;
-      
+
     case STATE_DMR:
       // Dev: +1 symb 648 Hz, symb rate = 4800
-    
+
       ADF7021_REG3 = ADF7021_REG3_DMR;
       ADF7021_REG10 = ADF7021_REG10_DMR;
 
@@ -647,7 +647,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
       ADF7021_REG2 |= (uint32_t) (m_dmrDev / div2)  << 19;  // deviation
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
       break;
-      
+
     case STATE_YSF:
       // Dev: +1 symb 900 Hz, symb rate = 4800
 
@@ -670,7 +670,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
       ADF7021_REG2 |= (uint32_t) (m_ysfDev / div2)  << 19;  // deviation
       ADF7021_REG2 |= (uint32_t) 0b111                     << 4;   // modulation (RC 4FSK)
       break;
-      
+
     case STATE_P25:
       // Dev: +1 symb 600 Hz, symb rate = 4800
 
@@ -740,7 +740,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
   // IF coarse cal (5)
   AD7021_control_word = ADF7021_REG5;
   Send_AD7021_control2();
-  
+
   // Delay for coarse IF filter calibration
   delay_IFcal();
 
@@ -754,7 +754,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
   ADF7021_REG2 |= (uint32_t) 0b110001         << 7;   // PA  
   AD7021_control_word = ADF7021_REG2;
   Send_AD7021_control2();
- 
+
   // TEST DAC (14)
   AD7021_control_word = 0x0000000E;
   Send_AD7021_control2();
@@ -778,7 +778,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
   // 3FSK/4FSK DEMOD (13)
   AD7021_control_word = ADF7021_REG13;
   Send_AD7021_control2();
-  
+
   // TEST MODE (disabled) (15)
   AD7021_control_word = 0x000E000F;
   Send_AD7021_control2();
@@ -788,7 +788,7 @@ void CIO::ifConf2(MMDVM_STATE modemState)
 void CIO::interrupt()
 {
   uint8_t bit = 0U;
-  
+
   if (!m_started)
     return;
 
@@ -850,7 +850,7 @@ void CIO::interrupt()
       even = ADF7021_EVEN_BIT;
     }
   }
-  
+
   // we sample the RX bit at rising TXD clock edge, so TXD must be 1 and we are not in tx mode
   if (!m_tx && clk == 1U && !m_duplex) {
     if(RXD_pin())
@@ -860,7 +860,7 @@ void CIO::interrupt()
 
     m_rxBuffer.put(bit, m_control);
   }
-  
+
   if (torx_request == true && even == ADF7021_EVEN_BIT && m_tx && clk == 0U) { 
       // that is absolutely crucial in 4FSK, see datasheet:
       // enable sle after 1/4 tBit == 26uS when sending MSB (even == false) and clock is low 
@@ -881,14 +881,15 @@ void CIO::interrupt()
       // last tranmittted bit is always the even bit
       // since the current bit is a transitional "don't care" bit, never transmitted
       even = !ADF7021_EVEN_BIT;
-  }  
+  }
 
   m_watchdog++;
   m_modeTimerCnt++;
+  m_int1counter++;
 
   if(m_scanPauseCnt >= SCAN_PAUSE)
     m_scanPauseCnt = 0U;
-  
+
   if(m_scanPauseCnt != 0U)
     m_scanPauseCnt++;
 }
@@ -897,7 +898,7 @@ void CIO::interrupt()
 void CIO::interrupt2()
 {
   uint8_t bit = 0U;
-  
+
   if(m_duplex) {
     if(RXD2_pin())
       bit = 1U;
@@ -906,6 +907,8 @@ void CIO::interrupt2()
 
     m_rxBuffer.put(bit, m_control);
   }
+
+  m_int2counter++;
 }
 #endif
 
diff --git a/CalDMR.cpp b/CalDMR.cpp
index 8977b22..d952eb1 100644
--- a/CalDMR.cpp
+++ b/CalDMR.cpp
@@ -53,7 +53,8 @@ CCalDMR::CCalDMR() :
 m_transmit(false),
 m_state(DMRCAL1K_IDLE),
 m_dmr1k(),
-m_audioSeq(0)
+m_audioSeq(0),
+m_count(0)
 {
   ::memcpy(m_dmr1k, VOICE_1K, DMR_FRAME_LENGTH_BYTES + 1U);
 }
@@ -72,6 +73,17 @@ void CCalDMR::process()
     case STATE_DMRDMO1K:
       dmrdmo1k();
       break;
+    case STATE_INTCAL:
+      // Simple interrupt counter for board diagnostics (TCXO, connections, etc)
+      // Not intended for precise interrupt frequency measurements
+      m_count++;
+      if (m_count >= CAL_DLY_LOOP) {
+        m_count = 0U;
+        uint16_t int1, int2;
+        io.getIntCounter(int1, int2);
+        DEBUG3("Counter INT1/INT2:", int1 >> 1U, int2);
+      }
+      break;
     default:
       break;
   }
diff --git a/CalDMR.h b/CalDMR.h
index 33fec17..8748093 100644
--- a/CalDMR.h
+++ b/CalDMR.h
@@ -47,6 +47,7 @@ class CCalDMR {
   DMRCAL1K  m_state;
   uint8_t   m_dmr1k[DMR_FRAME_LENGTH_BYTES + 1U];
   uint8_t   m_audioSeq;
+  uint32_t  m_count;
 };
 
 #endif
diff --git a/CalRSSI.cpp b/CalRSSI.cpp
index 0859cf4..11af51d 100644
--- a/CalRSSI.cpp
+++ b/CalRSSI.cpp
@@ -51,7 +51,7 @@ void CCalRSSI::process()
 
     if (m_navg >= 6U) {
       uint16_t ave = m_accum / 6U;
-      
+
       uint8_t buffer[6U];
       buffer[0U] = (m_max >> 8) & 0xFFU;
       buffer[1U] = (m_max >> 0) & 0xFFU;
diff --git a/Debug.h b/Debug.h
index c98da19..445e11a 100644
--- a/Debug.h
+++ b/Debug.h
@@ -36,7 +36,7 @@
 #define  DEBUG1(a)
 #define  DEBUG2(a,b)
 #define  DEBUG2I(a,b)
-#define  DEBUG3(a,b,c)
+#define  DEBUG3(a,b,c)      serial.writeDebug((a),(b),(c))
 #define  DEBUG4(a,b,c,d)
 #define  DEBUG5(a,b,c,d,e)
 
diff --git a/Globals.h b/Globals.h
index 419417c..8bfacd2 100644
--- a/Globals.h
+++ b/Globals.h
@@ -47,7 +47,8 @@ enum MMDVM_STATE {
   STATE_RSSICAL   = 96,
   STATE_CWID      = 97,
   STATE_DMRCAL    = 98,
-  STATE_DSTARCAL  = 99
+  STATE_DSTARCAL  = 99,
+  STATE_INTCAL    = 100
 };
 
 const uint8_t  MARK_SLOT1 = 0x08U;
diff --git a/IO.cpp b/IO.cpp
index 53d689b..00521aa 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -17,7 +17,7 @@
  *   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 "IO.h"
@@ -37,10 +37,12 @@ m_scanEnable(false),
 m_scanPauseCnt(0U),
 m_scanPos(0U),
 m_ledValue(true),
-m_watchdog(0U)
+m_watchdog(0U),
+m_int1counter(0U),
+m_int2counter(0U)
 {
   Init();
-  
+
   CE_pin(HIGH);
   LED_pin(HIGH);
   PTT_pin(LOW);
@@ -165,7 +167,7 @@ void CIO::process()
     }
     setRX(false);
   }
-  
+
   if(m_modemState_prev == STATE_DSTAR)
     scantime = SCAN_TIME;
   else if(m_modemState_prev == STATE_DMR)
@@ -402,3 +404,11 @@ uint32_t CIO::getWatchdog()
 {
   return m_watchdog;
 }
+
+void CIO::getIntCounter(uint16_t &int1, uint16_t &int2)
+{
+  int1 = m_int1counter;
+  int2 = m_int2counter;
+  m_int1counter = 0U;
+  m_int2counter = 0U;
+}
diff --git a/IO.h b/IO.h
index 0159184..b8e5a7e 100644
--- a/IO.h
+++ b/IO.h
@@ -47,6 +47,12 @@
 #define SCAN_TIME  1920
 #define SCAN_PAUSE 20000
 
+#if defined(DUPLEX)
+#define CAL_DLY_LOOP 96100U
+#else
+#define CAL_DLY_LOOP 106000U
+#endif
+
 extern uint32_t  m_frequency_rx;
 extern uint32_t  m_frequency_tx;
 extern uint32_t  m_pocsag_freq_tx;
@@ -70,7 +76,7 @@ class CIO {
   void      CE_pin(bool on);
   bool      RXD_pin(void);
   bool      CLK_pin(void);
-  
+
 #if defined(BIDIR_DATA_PIN)
   void      RXD_pin_write(bool on);
 #endif
@@ -90,7 +96,7 @@ class CIO {
 #if defined(DUPLEX)
   void      interrupt2(void);
 #endif
-  
+
 #if defined(BIDIR_DATA_PIN)
   void      Data_dir_out(bool dir);
 #endif
@@ -108,6 +114,7 @@ class CIO {
   void      setLoDevYSF(bool ysfLoDev);
   void      resetWatchdog(void);
   uint32_t  getWatchdog(void);
+  void      getIntCounter(uint16_t &int1, uint16_t &int2);
   void      selfTest(void);
 
   // RF interface API
@@ -162,6 +169,8 @@ class CIO {
   MMDVM_STATE        m_Modes[5];
   bool               m_ledValue;
   volatile uint32_t  m_watchdog;
+  volatile uint16_t  m_int1counter;
+  volatile uint16_t  m_int2counter;
 
 };
 
diff --git a/MMDVM_HS.cpp b/MMDVM_HS.cpp
index cf15140..3c08431 100644
--- a/MMDVM_HS.cpp
+++ b/MMDVM_HS.cpp
@@ -123,7 +123,7 @@ void loop()
   if (m_pocsagEnable && (m_modemState == STATE_POCSAG || pocsagTX.busy()))
     pocsagTX.process();
 
-  if (m_calState == STATE_DMRCAL || m_calState == STATE_DMRDMO1K)
+  if (m_calState == STATE_DMRCAL || m_calState == STATE_DMRDMO1K || m_calState == STATE_INTCAL)
     calDMR.process();
 
 #if defined(SEND_RSSI_DATA)
diff --git a/MMDVM_HS.ino b/MMDVM_HS.ino
index ebf4adc..7d55012 100644
--- a/MMDVM_HS.ino
+++ b/MMDVM_HS.ino
@@ -118,7 +118,7 @@ void loop()
   if (m_pocsagEnable && (m_modemState == STATE_POCSAG || pocsagTX.busy()))
     pocsagTX.process();
 
-  if (m_calState == STATE_DMRCAL || m_calState == STATE_DMRDMO1K)
+  if (m_calState == STATE_DMRCAL || m_calState == STATE_DMRDMO1K || m_calState == STATE_INTCAL)
     calDMR.process();
 
 #if defined(SEND_RSSI_DATA)
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 335c72c..e6738a0 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -212,7 +212,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 {
   if (length < 13U)
     return 4U;
-    
+
   bool ysfLoDev  = (data[0U] & 0x08U) == 0x08U;
   bool simplex   = (data[0U] & 0x80U) == 0x80U;
 
@@ -231,7 +231,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 
   MMDVM_STATE modemState = MMDVM_STATE(data[3U]);
 
-  if (modemState != STATE_IDLE && modemState != STATE_DSTAR && modemState != STATE_DMR && modemState != STATE_YSF && modemState != STATE_P25 && modemState != STATE_NXDN && modemState != STATE_POCSAG && modemState != STATE_DSTARCAL && modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_RSSICAL)
+  if (modemState != STATE_IDLE && modemState != STATE_DSTAR && modemState != STATE_DMR && modemState != STATE_YSF && modemState != STATE_P25 && modemState != STATE_NXDN && modemState != STATE_POCSAG && modemState != STATE_DSTARCAL && modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_INTCAL && modemState != STATE_RSSICAL)
     return 4U;
   if (modemState == STATE_DSTAR && !dstarEnable)
     return 4U;
@@ -278,7 +278,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   m_nxdnEnable   = nxdnEnable;
   m_pocsagEnable = pocsagEnable;
 
-  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL) {
+  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL || modemState == STATE_INTCAL) {
     m_dmrEnable = true;
     m_modemState = STATE_DMR;
     m_calState = modemState;
@@ -319,7 +319,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
 
   io.setLoDevYSF(ysfLoDev);
 
-  if (!m_firstCal || (modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_RSSICAL)) {
+  if (!m_firstCal || (modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_RSSICAL && modemState != STATE_INTCAL)) {
     if(m_dstarEnable)
       io.ifConf(STATE_DSTAR, true);
     else if(m_dmrEnable)
@@ -339,7 +339,7 @@ uint8_t CSerialPort::setConfig(const uint8_t* data, uint8_t length)
   io.printConf();
 #endif
 
-  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL)
+  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL || modemState == STATE_INTCAL)
     m_firstCal = true;
 
   return 0U;
@@ -356,7 +356,7 @@ uint8_t CSerialPort::setMode(const uint8_t* data, uint8_t length)
   if (modemState == m_modemState)
     return 0U;
 
-  if (modemState != STATE_IDLE && modemState != STATE_DSTAR && modemState != STATE_DMR && modemState != STATE_YSF && modemState != STATE_P25 && modemState != STATE_NXDN && modemState != STATE_POCSAG && modemState != STATE_DSTARCAL && modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_RSSICAL)
+  if (modemState != STATE_IDLE && modemState != STATE_DSTAR && modemState != STATE_DMR && modemState != STATE_YSF && modemState != STATE_P25 && modemState != STATE_NXDN && modemState != STATE_POCSAG && modemState != STATE_DSTARCAL && modemState != STATE_DMRCAL && modemState != STATE_DMRDMO1K && modemState != STATE_RSSICAL && modemState != STATE_INTCAL)
     return 4U;
   if (modemState == STATE_DSTAR && !m_dstarEnable)
     return 4U;
@@ -371,7 +371,7 @@ uint8_t CSerialPort::setMode(const uint8_t* data, uint8_t length)
   if (modemState == STATE_POCSAG && !m_pocsagEnable)
     return 4U;
 
-  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL) {
+  if (modemState == STATE_DMRCAL || modemState == STATE_DMRDMO1K || modemState == STATE_RSSICAL || modemState == STATE_INTCAL) {
     m_dmrEnable = true;
     tmpState = STATE_DMR;
     m_calState = modemState;
@@ -589,7 +589,7 @@ void CSerialPort::process()
           case MMDVM_CAL_DATA:
             if (m_calState == STATE_DMRCAL || m_calState == STATE_DMRDMO1K) {
               err = calDMR.write(m_buffer + 3U, m_len - 3U);
-            } else if (m_calState == STATE_RSSICAL) {
+            } else if (m_calState == STATE_RSSICAL || m_calState == STATE_INTCAL) {
               err = 0U;
             }
             if (err == 0U) {
@@ -1129,12 +1129,11 @@ void CSerialPort::writeRSSIData(const uint8_t* data, uint8_t length)
 #endif
 
 #if defined(ENABLE_DEBUG)
-
 void CSerialPort::writeDebug(const char* text)
 {
   if (!m_debug)
     return;
-    
+
   uint8_t reply[130U];
 
   reply[0U] = MMDVM_FRAME_START;
@@ -1154,7 +1153,7 @@ void CSerialPort::writeDebugI(const char* text, int32_t n1)
 {
   if (!m_debug)
     return;
-    
+
   uint8_t reply[130U];
 
   reply[0U] = MMDVM_FRAME_START;
@@ -1180,7 +1179,7 @@ void CSerialPort::writeDebug(const char* text, int16_t n1)
 {
   if (!m_debug)
     return;
-    
+
   uint8_t reply[130U];
 
   reply[0U] = MMDVM_FRAME_START;
@@ -1198,12 +1197,13 @@ void CSerialPort::writeDebug(const char* text, int16_t n1)
 
   writeInt(1U, reply, count, true);
 }
+#endif
 
 void CSerialPort::writeDebug(const char* text, int16_t n1, int16_t n2)
 {
   if (!m_debug)
     return;
-    
+
   uint8_t reply[130U];
 
   reply[0U] = MMDVM_FRAME_START;
@@ -1225,11 +1225,12 @@ void CSerialPort::writeDebug(const char* text, int16_t n1, int16_t n2)
   writeInt(1U, reply, count, true);
 }
 
+#if defined(ENABLE_DEBUG)
 void CSerialPort::writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3)
 {
   if (!m_debug)
     return;
-    
+
   uint8_t reply[130U];
 
   reply[0U] = MMDVM_FRAME_START;
@@ -1285,6 +1286,4 @@ void CSerialPort::writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n
 
   writeInt(1U, reply, count, true);
 }
-
 #endif
-
diff --git a/SerialPort.h b/SerialPort.h
index bbfb7a6..b1fa6b7 100644
--- a/SerialPort.h
+++ b/SerialPort.h
@@ -56,10 +56,10 @@ class CSerialPort {
   void writeDebug(const char* text);
   void writeDebug(const char* text, int16_t n1);
   void writeDebugI(const char* text, int32_t n1);
-  void writeDebug(const char* text, int16_t n1, int16_t n2);
   void writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3);
   void writeDebug(const char* text, int16_t n1, int16_t n2, int16_t n3, int16_t n4);
 #endif
+  void writeDebug(const char* text, int16_t n1, int16_t n2);
 
 private:
   uint8_t m_buffer[256U];
@@ -76,7 +76,7 @@ class CSerialPort {
   uint8_t setMode(const uint8_t* data, uint8_t length);
   void    setMode(MMDVM_STATE modemState);
   uint8_t setFreq(const uint8_t* data, uint8_t length);
-  
+
   // Hardware versions
   void    beginInt(uint8_t n, int speed);
   int     availableInt(uint8_t n);
@@ -85,4 +85,3 @@ class CSerialPort {
 };
 
 #endif
-
diff --git a/version.h b/version.h
index 47dc04b..cdfedd9 100644
--- a/version.h
+++ b/version.h
@@ -24,8 +24,8 @@
 
 #define VER_MAJOR       "1"
 #define VER_MINOR       "4"
-#define VER_REV         "11"
-#define VERSION_DATE    "20181028"
+#define VER_REV         "12"
+#define VERSION_DATE    "20181104"
 
 #if defined(ZUMSPOT_ADF7021)
 #define BOARD_INFO      "ZUMspot"