|Emission mode||USB; Various BPSK and QPSK waveforms|
|Known counterpart stations||E11, G11, S11, S11a, M03, F11, F03|
The P03 designator refers to the BPSK and QPSK modes. The following flavors have been spotted on the air so far, all of which are centered at +1000 Hz within the sideband:
P03a: BPSK, 62.5 Bd, 304-bit blocks
P03b: QPSK, 62.5 Bd, 304-bit blocks
BPSK, 125 Bd, 448-bit blocks
QPSK, 125 Bd, 448-bit blocks
QPSK, 200 Bd, 496-bit blocks
However, only P03a and P03b have stable schedules that use those modes year round. The remaining modes' schedules tend to shuffle to different F03/P03 modes along with seasonal frequency changes.
All P03 schedules are twice weekly, follow year-round UTC (no DST adjustments), and use one of three different frequencies depending on the month - one from November to February, another from May to August, and yet another one for the remaining months. There are always two identical broadcasts 5 minutes apart.
Each weekday typically carries a different message, which appears at the beginning of the month and is repeated throughout it; sometimes, both weekdays carry the same message, and sometimes a new message arrives in the middle of the month. Every week, the message is rescrambled, retaining only the headers and the length.