Possible Russian Marker "Airhorn" 4020kHz

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Possible Russian Marker "Airhorn" 4020kHz
Screen Shot 2017-02-03 at 7.26.06 PM.png
Frequencies 4020 kHzKiloHertz (kHz) 10^3 Hz4,020,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
4.02 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 4020000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).4,020 kHzKiloHertz (kHz) 10^3 Hz
4.02 MHzMegaHertz (MHz) 10^6 Hz
4020000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).4,020 kHzKiloHertz (kHz) 10^3 Hz
4.02 MHzMegaHertz (MHz) 10^6 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation
Bandwidth 2.8kHz2,800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0028 MHzMegaHertz (MHz) 10^6 Hz
2.8 kHzKiloHertz (kHz) 10^3 Hz
0.0028 MHzMegaHertz (MHz) 10^6 Hz
2.8 kHzKiloHertz (kHz) 10^3 Hz
0.0028 MHzMegaHertz (MHz) 10^6 Hz
Location Europe
Short Description Unknown signal that was recently discovered a few days ago on the uTwente webSDR. Features a suppressed lower sideband. Strong reception in Poland's webSDR.
I/Q Raw Recording
Audio Sample

This signal was discovered in the past week or so on uTwente's webSDR. This signal features a constant airhorn-like sound that is repeated. The sound is roughly .5 seconds with a .6 second pause. The signal also has a suppressed lower side-band, which is a feature on the Buzzer, and shares this characteristic with the Squeaky Wheel and Pip stations. I checked other SDR's that can tune to this frequency and it is best heard on Poland's SDR. Periodically, a RTTYRadio TeleTYpe source appears at 4020 kHzKiloHertz (kHz) 10^3 Hz, but through some research, the RTTYRadio TeleTYpe signal is not part of the broadcast signal.

Video ExamplesVideo Examples