|Emission mode||USB; Single-tone BPSK/QPSK on a +1000 Hz subcarrier|
|Known counterpart stations||E11, G11, S11, S11a, M03, F11, F03|
The designator P03 refers to the single-tone BPSK and QPSK modes. At least the following variants are known to exist:
|Variant||Modulation||Baud||Block size [bit]||Sample|
All P03 schedules are twice weekly, follow year-round UTC (no DST adjustments), and use up to three different frequencies depending on the month - one from November to February, another from May to August, and yet another for the remaining months. Each P03 transmission is followed by an identical repeat 5 minutes later.
F03 and P03 have been active since at least 2014, gradually replacing the older digital mode F11 over the next four years.