CIS-48
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| Frequencies | 16.459 MHz,17.289 MHz,17.234 MHz,5.017 MHz |
| Frequency Range | 5.017 MHz - 17.289 MHz |
| Mode | USB |
| Modulation | PSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 2 MHz,3 MHz |
| Location | Russia |
| Short Description | CIS-48 is an interesting data mode with a unique format. It uses a 4 DBPSK Preamble with a constant tone and changing OFDM modes as it transmits data. Origin is suspected to be in Russia. |
| I/Q Raw Recording | Download file |
| Audio Sample | |
CISCommonwealth of Independent States (CIS), the former Soviet Republic-48 is an interesting data mode with a unique format. It uses a 4 DBPSK preamble with a constant tone and changing OFDMOrthogonal Frequency-Division Multiplexing modes as it transmits data. Origin is suspected to be in Russia.
The first part of the transmission, the "Channel marker/beacon", is comprised of 4 DBPSK carriers, each pair spaced 500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). apart, with 700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). spacing within the pair. Each DBPSK carrier runs at 50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., and usually has the tone interrupt up to two times during the transmission, possibly indicating a different type of data being transmitted or codeword. Sometimes this beacon repeats during the transmission, or it may solely repeat without any data.
If there is data, after the beacon it will start transmitting a series of OFDMOrthogonal Frequency-Division Multiplexing waveforms, each ~3440 msmilliseconds (.001 of a second) long, and often changing the OFDMOrthogonal Frequency-Division Multiplexing waveform. The bandwidth of these waveforms range from ~2 kHzKiloHertz (kHz) 10^3 Hz to ~3 kHzKiloHertz (kHz) 10^3 Hz, and between these waveforms is a constant sinusoid tone.
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