Russian MFSK-OFDM-chirp hybrid modem
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| Frequencies | 12.176 MHz,16.257 MHz,16.259 MHz |
| Frequency Range | 12.176 MHz - 16.259 MHz |
| Mode | USB |
| Modulation | FM,FMCW,MFSK,OFDM |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 24 kHz,48 kHz,3 kHz,12 kHz,96 kHz |
| Location | Russia, Worldwide |
| Short Description | A supposedly Russian HF data mode with MFSK, OFDM and frequency sweeps, resulting in an interesting spectrogram and sound. |
| I/Q Raw Recording | Download file |
| Audio Sample | |
This is an interesting data mode that is believed to be used by Russian military or other agencies. The official name, purpose and equipment used to transmit this signal are not known, and there doesn't seem to be a commonly agreed name among amateur listeners.
The signal is transmitted in bursts. Each bursts starts with a pilot tone and a couple of irregular frequency sweeps, then follows a short MFSKMultiple Frequency Shift-Keying part and then a data transmission which apparently consists of OFDMOrthogonal Frequency-Division Multiplexing blocks and which is periodically interrupted by upward frequency sweeps, two in this case. The burst ends with a series of frequency sweeps. Frequency sweeps may also be transmitted before the OFDMOrthogonal Frequency-Division Multiplexing part begins.
Purpose of the different modulation techniques is not known. In this sample case there is also a continuous carrier slightly below the burst transmission. It's not always seen and it may or may not belong to this transmission.
Samples[edit]
Frequencies[edit]
The examples presented here were observed on the following frequencies, but the complete frequency range is likely much broader.
- 12176 kHzKiloHertz (kHz) 10^3 Hz
- 16257 kHzKiloHertz (kHz) 10^3 Hz
- 16259 kHzKiloHertz (kHz) 10^3 Hz
Video Examples[edit]
Additional Links[edit]
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