diff --git a/NXDNTX.cpp b/NXDNTX.cpp
index 326a8cc..0f3938c 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(2000U),
+m_buffer(1500U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
diff --git a/P25TX.cpp b/P25TX.cpp
index 81f98f1..48f688e 100644
--- a/P25TX.cpp
+++ b/P25TX.cpp
@@ -26,7 +26,7 @@
 const uint8_t P25_START_SYNC = 0x77U;
 
 CP25TX::CP25TX() :
-m_buffer(2000U),
+m_buffer(1500U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
diff --git a/YSFTX.cpp b/YSFTX.cpp
index b50d014..9e01f55 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(2000U),
+m_buffer(1500U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),