diff --git a/Configuration.cpp b/Configuration.cpp
index 95499f7..e484772 100644
--- a/Configuration.cpp
+++ b/Configuration.cpp
@@ -196,11 +196,11 @@ namespace
   int const combo_box_item_disabled (0);
 
 //  QRegExp message_alphabet {"[- A-Za-z0-9+./?]*"};
-  QRegExp message_alphabet {"[- @A-Za-z0-9+./?#<>]*"};
+  QRegExp message_alphabet {"[^\\x00-\\x1F]*"};
 
   // Magic numbers for file validation
   constexpr quint32 qrg_magic {0xadbccbdb};
-  constexpr quint32 qrg_version {100}; // M.mm
+  constexpr quint32 qrg_version {101}; // M.mm
 }
 
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index cb1a749..6da5dc7 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -163,7 +163,7 @@ QVector<QColor> g_ColorTbl;
 namespace
 {
   Radio::Frequency constexpr default_frequency {14074000};
-  QRegExp message_alphabet {"[- A-Za-z0-9+./?:!]*"}; // base alphabet supported by FT8
+  QRegExp message_alphabet {"[^\\x00-\\x1F]*"}; // base alphabet supported by FT8CALL
   // grid exact match excluding RR73
   QRegularExpression grid_regexp {"\\A(?![Rr]{2}73)[A-Ra-r]{2}[0-9]{2}([A-Xa-x]{2}){0,1}\\z"};