priyom.org

F03 BPSK63 QPSK63 QPSK125

Enigma ID n/a

Name F03 BPSK63 QPSK63 QPSK125
Frequencies 4-22 MHz
Status Active
Voice N/A
Emission mode USB; BFSK ACF=896 - 100Bd/200Hz, 200Bd/400Hz, 400Bd/960Hz; BPSK63 ACF=608; QPSK63 ACF=304; QPSK125 ACF=448
Location Poland
Activity pages

Known counterpart stations

This is a collective of one-way broadcast modes believed to be members of the Polish 11 family. Their frequency pool is the same as Polish 11, signal strength observations suggest Central Europe as TX origin, all their schedules are repeated 5 minutes later, send twice a week, and use up to three different frequencies seasonally - characteristics all shown by the known Polish 11 digital mode F11.

They all use proprietary modems and cannot be decoded with general-purpose tools. The PSK modes are based on the respective ham modes, but were modified to use completely different binary encodings, not handled by regular decoders designed for their ham versions. F03 is a BFSK system, featuring several variants with different baud/shift configurations and minor protocol differences between each other:

  • F03a: 100 Bd with 200 Hz shift (most common mode)
  • F03b: 200 Bd with 400 Hz shift
  • F03c: 400 Bd with 960 Hz shift (transmissions only last less than 20 seconds)

All modes are modulated as audio in USB. All protocols are still at an early stage of study, but the different modes are believed to be similar transportation layers over a single common messaging protocol.

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