|Enigma ID||M42 (catch-all MFA Moscow designator)||
|Emission mode||8PSK, 3000 Bd; 66-tone MFSK, 46.875 Bd, 46.875 Hz + 8PSK, 9000 Bd; 128-tone OFDM, 20.(979020) Bd, 23.4375 Hz; 128-tone OFDM, 41.(958041) Bd, 46.875 Hz|
|Known counterpart stations|
Perelivt[a] is a proprietary full duplex HF communication system, used exclusively by the Russian diplomatic service.
To establish a link, Perelivt automatically scans 3 channels in succession, emitting bursts of the 3000 Bd 8PSK waveform while simultaneously awaiting the other station's response; in case none is heard, the next channel is tried instead. Once a link is established, the system uses one of three different waveforms: MFSK, narrowband OFDM, or wideband OFDM.
Perelivt was introduced on the Russian diplomatic links around 2014, gradually replacing the previously used Serdolik through 2019.
Despite the ~3 kHz bandwidth of most waveforms, the emission mode is not USB on a -2 kHz offset. The signal is formed around the center frequency, occupying between 1.5 and 5.1 kHz on each side; the spectrograms provided here are to scale.
|3000 Bd 8PSK|
|128-tone OFDM (narrow)|
|128-tone OFDM (wide)|
- Perelivt is a code name created by Priyom to unambiguously refer to all four waveforms as part of a single system. Like "serdolik" (сердолик), "perelivt" (переливт) is a cryptocrystalline mineral. The actual name of the system is unknown.