diff --git a/AX25RX.cpp b/AX25RX.cpp
index 7a6b166..637bde0 100644
--- a/AX25RX.cpp
+++ b/AX25RX.cpp
@@ -63,7 +63,8 @@ m_state(),
 m_demod1(3),
 m_demod2(6),
 m_demod3(9),
-m_lastFCS(0U)
+m_lastFCS(0U),
+m_count(0U)
 {
   m_filter.numTaps = FILTER_LEN;
   m_filter.pState  = m_state;
@@ -75,28 +76,38 @@ void CAX25RX::samples(q15_t* samples, uint8_t length)
   q15_t output[RX_BLOCK_SIZE];
   ::arm_fir_fast_q15(&m_filter, samples, output, RX_BLOCK_SIZE);
 
-  m_lastFCS = 0U;
+  m_count++;
+
   CAX25Frame frame;
 
   bool ret = m_demod1.process(output, length, frame);
-  if (ret && frame.m_fcs != m_lastFCS) {
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
     DEBUG1("Decoder 1 reported");
-    m_lastFCS = frame.m_fcs;
-    serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
   }
 
   ret = m_demod2.process(output, length, frame);
-  if (ret && frame.m_fcs != m_lastFCS) {
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
     DEBUG1("Decoder 2 reported");
-    m_lastFCS = frame.m_fcs;
-    serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
   }
 
   ret = m_demod3.process(output, length, frame);
-  if (ret && frame.m_fcs != m_lastFCS) {
+  if (ret) {
+    if (frame.m_fcs != m_lastFCS || m_count > 2U) {
+      m_lastFCS = frame.m_fcs;
+      m_count   = 0U;
+      serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
+    }
     DEBUG1("Decoder 3 reported");
-    m_lastFCS = frame.m_fcs;
-    serial.writeAX25Data(frame.m_data, frame.m_length - 2U);
   }
 }
 
diff --git a/AX25RX.h b/AX25RX.h
index 3416b81..220d61d 100644
--- a/AX25RX.h
+++ b/AX25RX.h
@@ -38,6 +38,7 @@ private:
   CAX25Demodulator     m_demod2;
   CAX25Demodulator     m_demod3;
   uint16_t             m_lastFCS;
+  uint32_t             m_count;
 };
 
 #endif
diff --git a/AX25TX.cpp b/AX25TX.cpp
new file mode 100644
index 0000000..6f9ed5e
--- /dev/null
+++ b/AX25TX.cpp
@@ -0,0 +1,49 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   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 "AX25TX.h"
+
+
+CAX25TX::CAX25TX()
+{
+}
+
+void CAX25TX::process()
+{
+}
+
+uint8_t CAX25TX::writeData(const uint8_t* data, uint16_t length)
+{
+  return 0U;
+}
+
+void CAX25TX::setParams(int8_t twist)
+{
+}
+
+void CAX25TX::setTXDelay(uint8_t delay)
+{
+}
+
+uint8_t CAX25TX::getSpace() const
+{
+  return 0U;
+}
+
diff --git a/AX25TX.h b/AX25TX.h
index ffe31be..d89f77c 100644
--- a/AX25TX.h
+++ b/AX25TX.h
@@ -21,6 +21,8 @@
 
 #include "Config.h"
 
+#include "SerialRB.h"
+
 class CAX25TX {
 public:
   CAX25TX();