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Old 03-30-2020, 10:26 AM   #4
Join Date: Oct 2013
Location: Wales
Posts: 4
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The procedure in real life for starting a Morse code transmission is: AA AA AA (each set is transmitted as a single letter).
There is also the International Code of Signals which had 3-letter code for many, many situations.

Here is an old version of the International Code of Signals for anyone interested:
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