diff --git a/NXDNTX.cpp b/NXDNTX.cpp
index 495a46f..905c502 100644
--- a/NXDNTX.cpp
+++ b/NXDNTX.cpp
@@ -45,7 +45,7 @@ const uint8_t NXDN_PREAMBLE[] = {0x57U, 0x75U, 0xFDU};
 const uint8_t NXDN_SYNC = 0x5FU;
 
 CNXDNTX::CNXDNTX() :
-m_buffer(1500U),
+m_buffer(2000U),
 m_modFilter(),
 m_sincFilter(),
 m_modState(),