|Emission mode||USB + carrier|
M01b was a Russian number station. Last heard on May 29, 2020.
|815||631 631||45 45||= =||19836 19836 ... 83788 83788||= =||631||45||000|
|3-digit ID||3-digit group
|5-digit paired groups||3-digit group
Zero was sent as "T" - a single dash.
All M01b schedules transmitted the same message, with each schedule using a different 3-digit ID. The messages were always between 30 and 50 groups long, and replaced monthly on the 1st of the month.
M01b was keyed semi-automatically by an operator using a computer running Microsoft Windows. Windows XP was used as of 2014, later upgraded to Windows 7 by 2019, as indicated by leaked sound effects:
M01b with the Windows XP shutdown sound (at 14:05)
M01b with the Windows 7 shutdown sound (at 1:29)