|Name||Russian Man "Control"|
|Frequencies||Various (Mainly 13883)|
|Voice||Male, automated (the same as S06)|
|Emission mode||USB + carrier|
|Known counterpart stations|
S25 is run by Russian Main Intelligence Directorate (GRU).
The standard a format is given below. The outro is sometimes preceded by a quintuple group repeated for several minutes.
|Section #1||Section #2||Outro|
|3-figure ID||5-figure group, purpose unknown||3-figure ID||5-figure group, purpose unknown|
|Repeated for 4 minutes||Repeated for 4 minutes|
Nowadays S25 is inactive. Until December 2017 it ran only one consistent schedule, which transmitted at half hour and had a slightly different format. Both sections were sent on the same frequency, and then the transmission was repeated 10 minutes later on a different, random frequency.
In the 1990s S25 had a daily schedule at 08:00 UTC, for the first 20 minutes on 14890kHz, then for the remaining 20 minutes on 11270kHz. Each transmission had four sections, repeated for 10 minutes each. The ID was always 615. The ending was "615 615 615 000". In 1998, its operation was changed to weekly on Monday only, then disappeared completely in 1999.
In September 2004, the current format was introduced. S25 can have years long breaks in operation - it was unheard in 2004-2007, 2007-2012, 2012-2014.
Since at least 2014, S25 revived with a new weekly schedule and frequencies, which finally ceased in December 2017.