diff --git a/DMRDMOTX.cpp b/DMRDMOTX.cpp
index ef0abab..e6b13c8 100644
--- a/DMRDMOTX.cpp
+++ b/DMRDMOTX.cpp
@@ -24,7 +24,7 @@
 const uint8_t DMR_SYNC = 0x5FU;
 
 CDMRDMOTX::CDMRDMOTX() :
-m_fifo(),
+m_fifo(875U),
 m_poBuffer(),
 m_poLen(0U),
 m_poPtr(0U),
diff --git a/Globals.h b/Globals.h
index 71de1ce..aa7c9c8 100644
--- a/Globals.h
+++ b/Globals.h
@@ -62,8 +62,8 @@ const uint8_t  MARK_NONE  = 0x00U;
 #include "Debug.h"
 #include "Utils.h"
 
-const uint16_t TX_RINGBUFFER_SIZE = 512U;
-const uint16_t RX_RINGBUFFER_SIZE = 512U;
+const uint16_t TX_RINGBUFFER_SIZE = 1024U;
+const uint16_t RX_RINGBUFFER_SIZE = 1024U;
 
 extern MMDVM_STATE m_modemState;
 extern MMDVM_STATE m_modemState_prev;