M03 was the Morse code mode of the Polish 11 operator. Retired in February 2016.
|3 minutes and 10 seconds|
|437||/||00||= = 0 0 0|
|3 minutes and 10 seconds||45 seconds|
|877||/||38||= =||33542 33542 ... 85649 85649||= =||877||/||38||= =||33542 26316 ... 12829 85649||= = 0 0 0|
|3-digit ID||Group count||5-digit paired groups,
with pauses every 10 pairs
|3-digit ID||Group count||5-digit single groups,
with pauses every 10 groups
Zero was sent as "T" - a single dash. On some schedules, null messages were sent slower than the traffic.
All M03 schedules were twice weekly, followed year-round UTC (no daylight saving), and used one of three different frequencies depending on the month - one from November to February, another from May to August, and yet another for the remaining months.
On each schedule, only null messages were broadcast for the majority of the time. However, traffic was sent at least once every month, on a seemingly random week. The standard group count range was 30 to 38 groups inclusive.