Nickname: None
Inactive, since 2000
Emission mode: AM
Voice Summary:
Believed Country of Origin:
Czech Republic[2]

Station Structure

See Summary

Station Summary

S31 was a military station used by the Czech Republic that sent test counts.  The call-up had 9 tones that sounded like a telephone ringing.[1]  Then, a short pause and a message was sent, followed by counting from 50-59.  The numbers of cycles that S31 counted from 50-59 varied from 9-19 times.  Counts also did not always start at 50 or end at 90.[2]


1.)        “Czech Station 2136.” Nineteenth Edition of the N&O Column / Spooks Newsletter.
                     N.p., 3 Nov. 199. Web. 31 Oct. 2014.
2.)        “S31 New Designation.” ENIGMA Newsletter 18 (Jan. 2000): 15. Print.

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