|Emission mode||USB; Various DBPSK and DQPSK modulations|
|Known counterpart stations||E11, G11, S11, S11a, M03, F11, F03|
The P03 designator refers to the DBPSK and DQPSK modes. Four different flavors have been spotted on the air so far:
P03a: DBPSK, 62.5Bd, Center +1000Hz, 304-bit blocks
P03b: DQPSK, 62.5Bd, Center +1000Hz, 304-bit blocks
DBPSK, 125Bd, Center +1000Hz, 448-bit blocks
DQPSK, 125Bd, Center +1000Hz, 448-bit blocks
However, only P03a and P03b have stable schedules that use those modes year round. The remaining two modes have only one schedule each, which 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.