Unidientified (MFSK-13)

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Unidientified "MFSK-13"
Unid mfsk 13.PNG
Frequencies 4.871 MHz
Frequency Range 4.871 MHz - 4.871 MHz
Mode USB
Modulation MFSK
Bandwidth 3.2 kHz
Short Description Unidentified 13 tone MFSK signal, measures about 32 milliseconds per tone, looks like serdolik with less tones and slower. Possible russian diplomatic signal
I/Q Raw Recording
Audio Sample
Courtesy of user Fiber


Sample 1

Sample 2

Sample 3


4871 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables), ~3.2kHz bandwidth

Related signal?[edit]

2017-08-08 2205z 4511kHz begins with similar 13 tone pattern, but switches to 8? seems to be double the speed as well.

This signal seems to be similar, if not related