Enigma ID P03

Spectrum image P03a spectro

Name P03a, P03b
Status Active
Voice N/A
Emission mode USB; Various DBPSK and DQPSK modulations
Location Poland
Activity pages

Known counterpart stations E11, G11, S11, S11a, M03, F11, F03

F03/P03 is a Polish 11 modem that succeeded F11 in mid 2010s. It contains a number of different serial PSK and FSK waveforms, all of which use variations of the same protocol.

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.

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