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S06s is ran by Foreign Intelligence Service of Ukraine (SZRU).
For the current times and frequencies, refer to our number station
Note that the zeroes at the end are always spaced.
S06s follows the same transmission format as the Russian GRU
possibly it runs on equipment donated by that agency. However,
its operation habits are radically different from S06.
S06s has a specific protocol for its messages. It sends the same
message for the first two weeks of the month, then changes to
another one for the next two weeks. On the fifth week, only null
messages are ever sent, though repeats of messages from the
previous weeks have been noted, presumably as a mistake. The
messages itself are believed to be composed out of instructions
from a code book, as the same groups and strings are seen very
frequently in messages spanning several years, sometimes even with
only one digit changed. The first digits of each transmission
before the message (the ID, the 3-figure group, the amount of
groups) are always unique. Most of the messages are 5 to 9 groups
long, rarely 10 or even more.
S06s runs on schedules with two sendings each, the second always
follows 10 minutes after the transmission (the sole exception is ID
374 on Tuesday, which repeats 15 minutes later). The
repeat frequency is either higher or lower. The frequencies are
usually changed seasonally - one frequency is used from November to
February, another from May to August, and yet another for the
remaining months - though some schedules with the same frequencies
all year round are being noted. The frequencies are normally reused
on a yearly basis, but rarely they have been seen shifting
The S06s transmissions usually start a few seconds early or a
few seconds late, and this changes over time, presumably they're
started up manually. S06s has two main transmitters, which differ
by the way the lower sideband is suppressed. On the first, the LSB
is heavily suppressed, but can still be noticed if the signal is
strong enough. The other one has only about -10 dB suppression.
S06s also has a third transmitter, with perfect A3E modulation,
which is used for backup only. The audio is usually heavily
S06s runs off a computer running Windows XP, as on Friday,
October 10th, 2014, S06s was followed by the Windows XP USB
S06s started in May 2004. S06s at the time
was reportedly using the same male voice as S06, but it also had a
female voice, which was provided by the same person who also voiced
the sister station E17z.
Up until July 2004, S06s repeated one message for the entire
month, then it was changed to send messages only for the first two
weeks of the month, then null messages afterwards,
but has later reverted to the previous behavior.
The current voice started in October 2005.
In May 2009, the current message protocol
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