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Reference   Call     Preamble           Message          Ending
 M1        197 R4   381 381 40 40 = =    40x5F   = = 381 381 40 40 000

M1 is hand sent, using short zero, in the A network and the messages have a
usual group count of 40 groups.Although just recently group counts have
been varying between 33 and 48. The last group is now always the date the
message was compiled and the group count minus one. For example a message
of 40 groups compiled on the 10th of the month, the last group would be
10039. This also applies to the M1 B network.
Type of transmission is MCW using low modulation of 2 audio tones. Sent at
about 17 WPM although this can vary depending on the operator