priyom.org

XPA2

Enigma ID XPA2

Spectrum image xpa2

Name
Frequencies
Status Active
Voice N/A
Emission mode USB; MFSK-14, 7.8125Bd
Location Moscow, Russia
Activity pages

Download audio sample

Known counterpart stations E07, G07, S07, V07, M12, XP, XPA, XPH

XPA2 is a digital flavor of the Russian 7 operator. It utilizes a custom 14-tone MFSK mode.

Scheduling

XPA2 operates in regular schedules of three identical transmissions, spaced 20 minutes apart. The frequencies of the subsequent repeats usually decrease, sometimes increase, in most cases by about 1-2 MHz.

Message format

XPA2 messages consist entirely of 5-digit groups, beginning with a 3-group header. The purpose of the first and third groups are unknown, but the second group is the group count minus three. The first digit of the first group is always zero.

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