Polish Intelligence 100bd 625Hz FSK

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Polish Intelligence 100bd/625Hz FSK
F11.png
Frequencies 4 MHz,20 MHz
Frequency Range 4 MHz - 20 MHz
Mode USB
Modulation FSK
ACF 160 ms, 960 ms.
Bandwidth 3.5 kHz
Location Poland
Short Description One-way broadcast system, used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules.
I/Q Raw Recording
Audio Sample

One-way broadcast system, used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules.

This mode has very close ties to the analogue broadcasts from the same agency, known by their ENIGMA codes E11, S11a, and M03. It always sends 15/20 minutes before them, delivering the same message that would later be sent by analogue means, on a nearby frequency. The digital broadcast also repeats 5 minutes after the first one, on the same frequency.

However, not every analogue schedule has a digital equivalent.

Samples[edit]

Null message:

Traffic:

Decoding Software[edit]

Hobby Level Software

Additional Links[edit]