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 Ref   Call          Preamble           Message          Ending
 M3    044/00 (R5)*                    No Message       = = 000
 M3    044/54 (R5)*    = =               54x5F          = = 000
 M3A   552/111/00(R5)*                 No Message       = = 000

Morse is sent at about 17 WPM except for 503 which
is very slow at 5 WPM. That transmission is normally on 10721. Some
transmissions sent in MCW.
M3A is not sent very often and the meaning of it is not known could
possibly be confirmation of receipt of message.Only triplets of 111 and 333
have been noted.
When M3 send a message after the 54x5F groups the ID is sent again 6 times
then the message is repeated as 54x5f groups. 54 single groups
Is Usually on between 0700 and 1200 on the hour and the half hour.Messages
are usually between 50 and 59 groups, possibly so they fit in the 30
minutes transmission time.Repeat transmissions are usual.