No audio sample available yet
First heard 3 May 2006, ceased 2 June 2006 then
re-appeared Dec 06
See NL 35 July 2006 for full initial report.[P36 to 39]
Narrow bandwidth, 15Hz tonal separation.
Operates at 3 differing speeds and can be mistaken for another
system, it is essential to
confirm tonal values.
The construction of the tonal sequences clearly indicate this is
another system designed for
automated reception however the limited samples preclude, for the
time being, the
establishment of possible tonal secondary functions. However the
nature of the transmissions
together with the wide range of frequencies used lead us to
believe that this is probably of a
This is another MFSK data system with Russian origin. It's
similar to XPA but has few differences:
Result of the tone investigation made by danix111 in June 2011
Please keep in mind that those tone values are different on
Each transmission starts with two-tone intro, lower and longer
tone is space tone (995 Hz), meanwhile higher and shorter one is
fig 9 (1235 Hz). It's exactly 2 minutes long.
Immediately after it 7-tone synchronisation segment follows:
6262626. Latter part consists of alternating repeat (1075 Hz) and
start tones (1035 Hz), both repeated 10 times. After both parts
long start pulse follows, which is also 995 Hz.
Messages are 5 figure groups. First 3 groups are, paded with
zeroes in the beginning when needed:
Regarding decode keys, they depend on a schedule. The most of
them currently reported are usually starting with 1 or 7. There
seems to be relation between them that needs analysis.
The rest of message is obvious - encrypted content. Everything
ends with alternating fig 0 (1085 Hz) and end (1055 Hz) tones, also
repeated 10 times. After them transmission is done.
Null messages take format 0xxxx 00001 00000 10140.
If next message is going to be broadcasted, 00000 00000 part
appears then 2nd message follows.
XPA2 is very active, changing schedules all the time. Usual for
them is 10 minute delay between repeats. Some got 20 minute delay,
they are believed to contain transmissions longer than 9 minutes
that can occur sent when needed. Some schedules are reported
regularly every month, some can go one month then just vanish from
Known regular XPA2 schedules include (up to date frequencies are
given in Priyom.org's 2011 schedule):
Tuesday, Thursday - 19:30/19:50/20:10
Tuesday, Sunday - 21:00/21:20/21:40
Thursday, Friday - 22:00/22:10/22:20
XPA2 is still on search, not all schedules are known.
Enigma 2000 has triangulated XPA2 and it's reportedly located
south of Moscow.
priyom.org by Priyom web team is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. Based on a work at priyom.org.