CIS MFSK-21-13
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| Frequencies | 4.834 MHz,16.292 MHz |
| Frequency Range | 4.834 MHz - 16.292 MHz |
| Mode | USB |
| Modulation | MFSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 3.3 kHz |
| Location | Russia, Worldwide |
| Short Description | An MFSK data mode that is believed to originate from Russian sources. Changes between MFSK-21, MFSK-13 and different speeds. |
| I/Q Raw Recording | — |
| Audio Sample | |
This is an MFSKMultiple Frequency Shift-Keying signal that is believed to originate from Russian sources. Transmission changes between 21-tone MFSKMultiple Frequency Shift-Keying with 125 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). tone spacing and 13-tone MFSKMultiple Frequency Shift-Keying with 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). tone spacing, and different speeds. Sometimes only some of these modes may be used. The purpose of and the equipment used to transmit this signal are unknown.
The MFSKMultiple Frequency Shift-Keying-21 mode occupies about 2600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). and the MFSKMultiple Frequency Shift-Keying-13 mode about 3000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). of bandwidth. Total bandwidth is slightly more, about 3300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., if the designated transmission frequencies are assumed to hit integer kHzKiloHertz (kHz) 10^3 Hz.
Samples[edit]
In these examples, transmission starts as 21-tone MFSKMultiple Frequency Shift-Keying, then changes to 13-tone MFSKMultiple Frequency Shift-Keying and finally to faster 13-tone MFSKMultiple Frequency Shift-Keying. Other transmissions may or may not follow this format.| MFSKMultiple Frequency Shift-Keying-21 | MFSKMultiple Frequency Shift-Keying-13 slow | MFSKMultiple Frequency Shift-Keying-13 fast | Complete transmission |
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Frequencies[edit]
This mode has been observed on the following frequencies at least:
4834 kHzKiloHertz (kHz) 10^3 Hz
4896 kHzKiloHertz (kHz) 10^3 Hz
5192 kHzKiloHertz (kHz) 10^3 Hz
5207 kHzKiloHertz (kHz) 10^3 Hz
5215 kHzKiloHertz (kHz) 10^3 Hz
5467 kHzKiloHertz (kHz) 10^3 Hz
5477 kHzKiloHertz (kHz) 10^3 Hz
5789 kHzKiloHertz (kHz) 10^3 Hz
5948 kHzKiloHertz (kHz) 10^3 Hz
7817 kHzKiloHertz (kHz) 10^3 Hz
8136 kHzKiloHertz (kHz) 10^3 Hz
9059 kHzKiloHertz (kHz) 10^3 Hz
9280 kHzKiloHertz (kHz) 10^3 Hz
12138.8 kHzKiloHertz (kHz) 10^3 Hz
Video Examples[edit]
16292 KHz USB Unid 13 & 21 tones MFSK 31Aug23 2200z
Additional Links[edit]
Analysis of CIS-21-13 by i56578-swl
Additional Images[edit]
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