|Emission mode||USB + carrier|
|815||631||45||BT BT||19836 19836 66417 66417 ... 83788 83788||BT BT||631||45||000|
|3-figure ID||3-figure group, purpose unknown||Amount of 5-figure groups in the message||5-figure paired groups||3-figure group, purpose unknown||Amount of 5-figure groups in the message|
|Repeated for 4 minutes||Repeated twice||Repeated twice||Repeated twice||Repeated twice|
M01b uses the same format as M01, however it differs in scheduling habits. The message sent on each schedule remains the same for 4 weeks, then it is changed, and the cycle repeats.
Unlike M01, M01b uses both the two-tone CW modulation, and also an additional carrier. M01b has a consistent speed of 10 WPM, and uses a computer running Windows, with the numbers typed in manually by an operator. Zero is sent as "T" - a single dash.
Leaked Windows system sounds indicate that Windows XP was used as of 2014, while later either Windows Vista or 7 was used as of 2019.
M01b with Windows XP shutdown sound (at 14:05)
M01b ending with Windows Vista/7 shutdown sound (at 1:29)
M01b transmission times are adjusted along with DST in the CET timezone.