Added CRC checks to 2,3 and 4 block PDU messages. Enforcing message validation via the message processor. Updated the P25 Activity Summary to show frequencies in megahertz and to add site aliasing to the summary text.

src/decode/p25/message/pdu/osp/data/GroupDataChannelGrantExtended.java

@@ -2,6 +2,7 @@ package decode.p25.message.pdu.osp.data;
 
 import java.util.Date;
 
+import crc.CRCP25;
 import alias.AliasList;
 import bits.BitSetBuffer;
 import decode.p25.message.pdu.PDUMessage;
@@ -42,6 +43,10 @@ public class GroupDataChannelGrantExtended extends PDUMessage
             DataUnitID duid, AliasList aliasList )
     {
 	    super( message, duid, aliasList );
+	    
+	    /* Header block is already error detected/corrected - perform error
+	     * detection correction on the intermediate and final data blocks */
+	    mCRC[ 1 ] = CRCP25.correctPDU1( mMessage );
     }
 
     @Override