diff --git a/CWIdTX.cpp b/CWIdTX.cpp
index 8f69311..97a2ce4 100644
--- a/CWIdTX.cpp
+++ b/CWIdTX.cpp
@@ -24,7 +24,7 @@
 #include "CWIdTX.h"
 
 q15_t TONE[] = {
-    0, 647, 1250, 1767, 2165, 2415, 2500, 2415, 2165, 1767, 1250, 647, 0, -647, -1250, -1767, -2165, -2415, -2500, -2415, -2165, -1767, -1250, -647};
+    0, 518, 1000, 1414, 1732, 1932, 2000, 1932, 1732, 1414, 1000, 518, 0, -518, -1000, -1414, -1732, -1932, -2000, -1932, -1732, -1414, -1000, -518};
 
 q15_t SILENCE[] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};