diff --git a/NXDNTX.cpp b/NXDNTX.cpp
index 9792af2..326a8cc 100644
--- a/NXDNTX.cpp
+++ b/NXDNTX.cpp
@@ -27,7 +27,7 @@ const uint8_t NXDN_PREAMBLE[] = {0x57U, 0x75U, 0xFDU};
 const uint8_t NXDN_SYNC = 0x5FU;
 
 CNXDNTX::CNXDNTX() :
-m_buffer(2500U),
+m_buffer(2000U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
diff --git a/P25TX.cpp b/P25TX.cpp
index 96cc355..81f98f1 100644
--- a/P25TX.cpp
+++ b/P25TX.cpp
@@ -26,7 +26,7 @@
 const uint8_t P25_START_SYNC = 0x77U;
 
 CP25TX::CP25TX() :
-m_buffer(2500U),
+m_buffer(2000U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
diff --git a/SerialRB.h b/SerialRB.h
index 79b3c5c..e0022ab 100644
--- a/SerialRB.h
+++ b/SerialRB.h
@@ -31,7 +31,7 @@ Boston, MA  02110-1301, USA.
 #include <Arduino.h>
 #endif
 
-const uint16_t SERIAL_RINGBUFFER_SIZE = 2000U;
+const uint16_t SERIAL_RINGBUFFER_SIZE = 1000U;
 
 class CSerialRB {
 public:
diff --git a/YSFTX.cpp b/YSFTX.cpp
index 1b88e75..b50d014 100644
--- a/YSFTX.cpp
+++ b/YSFTX.cpp
@@ -27,7 +27,7 @@ const uint8_t YSF_START_SYNC = 0x77U;
 const uint8_t YSF_END_SYNC   = 0xFFU;
 
 CYSFTX::CYSFTX() :
-m_buffer(2500U),
+m_buffer(2000U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),