Enigma ID M42 (catch-all MFA Moscow designator)
Name Perelivt
Status Active
Voice N/A
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
Location Worldwide
Activity pages

Perelivt[a] is a proprietary communication system used exclusively by the Russian diplomatic service.

Perelivt links are established using the 3000 Bd 8PSK waveform in one of two different ways:

  • By alternating between two channels, calling for 60 seconds on each.
  • By scanning three channels in succession, calling for 15 seconds on each.

By default, links are established using the MFSK waveform. Perelivt also offers narrowband and wideband OFDM modes, which may be used only after the link has been terminated and re-established from scratch.


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

66-tone MFSK

128-tone OFDM (narrow)

128-tone OFDM (wide)


  1. 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.