diff --git a/Main.pas b/Main.pas
index 4e67822..56d2393 100644
--- a/Main.pas
+++ b/Main.pas
@@ -62,8 +62,8 @@   TFieldDefinition = record
     (C: 'Zone';       R: '[0-9]*';                         L: 4;  T:Ord(etItuZone)),
     (C: 'Age';        R: '[0-9][0-9]';                     L: 2;  T:Ord(etAge)),
     (C: 'Power';      R: '([0-9]*)|(K)|(KW)|([0-9A]*[OTN]*)'; L: 4; T:Ord(etPower)),
-    (C: 'Number';     R: '([0-9]*)([LMHP])';                  L: 4; T:Ord(etJaPref)),
-    (C: 'Number';     R: '([0-9]*)([LMHP])';                  L: 7; T:Ord(etJaCity))
+    (C: 'Number';     R: '([0-9AOTN]*)([LMHP])';           L: 4; T:Ord(etJaPref)),
+    (C: 'Number';     R: '([0-9AOTN]*)([LMHP])';           L: 7; T:Ord(etJaCity))
   );
 
 type
diff --git a/Station.pas b/Station.pas
index 9d6793e..d931bc3 100644
--- a/Station.pas
+++ b/Station.pas
@@ -350,6 +350,23 @@ function TStation.NrAsText: string;
     if Random < 0.97
       then Result := StringReplace(Result, '9', 'N', [rfReplaceAll]);
     end;
+
+  // for JARL ALLJA, ACAG contest
+  // The probability is adjusted to the domestic CW situation
+  if (Ini.RunMode <> rmHst) and (SentExchTypes.Exch2 in
+    [etJaPref, etJaCity]) and
+    (MyCall <> Ini.Call) then
+    begin
+    if Random < 0.4 then begin
+      Result := StringReplace(Result, '0', 'O', [rfReplaceAll]);
+      Result := StringReplace(Result, '00', 'TT', [rfReplaceAll]);
+    end
+    else if Random < 0.8
+      then Result := StringReplace(Result, '0', 'T', [rfReplaceAll]);
+
+    if Random < 0.1
+      then Result := StringReplace(Result, '9', 'N', [rfReplaceAll]);
+    end;
 end;