CIS MFSK-16 XPA2

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CIS MFSK-16 XPA2
XPA2.png
Frequencies 3 MHz,30 MHz
Frequency Range 3 MHz - 30 MHz
Mode USB
Modulation MFSK
ACF
Bandwidth 250 Hz
Location Russia
Short Description Enigma Designation XPA2, also known as MFSK-16, CIS MFSK-14, and CIS MFSK-16, is a 14-tone MFSK signal said to have origin from Russian Intelligence and Foreign Ministry stations.
I/Q Raw Recording
Audio Sample

Enigma Designation XPA2, also known as MFSKMultiple Frequency Shift-Keying-16, CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-14, and CISCommonwealth of Independent States (CIS), the former Soviet Republic MFSKMultiple Frequency Shift-Keying-16, is a 14-tone MFSKMultiple Frequency Shift-Keying signal said to have origin from Russian Intelligence and Foreign Ministry stations.

XPA2 has a very unique preamble sequence, and a lower "sync" tone every 5 tones (numbers) that other MFSKMultiple Frequency Shift-Keying systems don't have. The preamble sequence can go on for a very long time before the actual message starts. XPA2 transmits 5 number groups of unknown meaning. XPA2 uses 7.5 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. and uses 15 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shifts between tones occupying 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). of bandwidth. XPA2 was first seen on May 2006 and has been active ever since.


Although XPA2 uses 14 tones, its spacing suggests 16 possible tones, but two tones are always unused.


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