|Voice||Female, automated, with Polish accent|
|Known counterpart stations||E11b, M03c, POL FSK|
S11b refers to S11a messages which began and ended with "77777 77777", which were included in the amount of groups given in the intro. Active in years 2006 - 2009.
S11a schedules, i.e. those that send null messages, sent a 30 to 39 groups long E11b message one week of a month, each schedule on a different one. Since March 2009 the same procedure of sending messages is being followed, but "77777" groups are gone - however similar groups are still present in S11a's digital counterpart, POL FSK.