Polish Intelligence 100bd 625Hz FSK
From Signal Identification Wiki
 | |
|---|---|
| Frequencies | 4 MHz,20 MHz |
| Frequency Range | 4 MHz - 20 MHz |
| Mode | USB |
| Modulation | FSK |
| ACF | Primary: 960 ms, Secondary: 160 ms |
| Emission Designator | — |
| Bandwidth | 3.5 kHz |
| Location | Poland |
| Short Description | Also known as F11, this is a one-way broadcast system that was used by one of Polish intelligence agencies for delivery of messages to their operatives abroad on fixed schedules. |
| I/Q Raw Recording | — |
| Audio Sample | |
Also known as F11, this is a one-way broadcast system that was used by "Polish 11", one of Polish intelligence agencies, for delivery of messages to their operatives abroad on fixed schedules. This mode has not been active since 2018. Its successors are F03 and P03.
This mode has very close ties to the analogue broadcasts from the same agency, known by their ENIGMA codes E11, S11a, and M03. It was always sent 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 used to repeat 5 minutes after the first one, on the same frequency.
However, not every analogue schedule had a digital equivalent.
Samples[edit]
Null message:
Traffic:
