Activity: Inactive, since 2000
Emission mode: AM
Voice Summary: Female
Believed Country of Origin: Czech Republic
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. 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.