S06s is the Russian language mode of the Ukrainian sz operator. It has brutally ceased all operations since the night of February 24, 2022, when the large-scale military invasion of Ukraine by Russia began.

Null format:

Traffic format:

All S06s schedules are weekly and consist of 2 identical transmissions 10 minutes apart. Each transmission uses one of three different frequencies depending on the month - one from November to February, another from May to August, and yet another for the remaining months. The 3-digit ID identifies a particular schedule.

Tests are performed prior to each transmission: 10 minutes before the first, and 2 minutes before the second. They consist of a long 1200 Hz tone, followed by the 3-digit ID of the upcoming transmission spoken once.

Each schedule carries two messages during a month - one on weeks 1 & 2, and another on weeks 3 & 4; no message is ever sent on week 5. Typically, not a single digit is repeated within the preamble, while the 3-digit groups begins only with 2, 4, 5, 8, or 9. All messages are at least 5 groups long, and entire strings of groups are frequently re-used.