First discovered in 1981, E21 is a numbers station that’s very similar to that of E05, using almost the same format for the messages. The majority of the time the station used 4-figure groups instead of the usual 5. In some rare instances it did use 5 digit groups. The station ceased operations in March 1995.
It’s voice is also another version of E05’s, with a higher pitch and tempo.
4 Digit Groups Recording
5 Digit Groups Recording
E21 Station Format
|430 430 430||1234567890||Ten 1 kHz beeps play||Count 120||1098 5131 …||Repeat||Count 125||4052 7201 …||End|
|3-figure ID||Counting||Group count||4-figure single groups||Group count||4-figure single groups|
|Repeated for 10 minutes||Repeated 2x||Repeated 2x
Numbers Station Summary
Nickname: 4F Counting
Emission Mode: USB, USB + Carrier
Voice Summary: Automated woman’s voice with an American accent. Another version of E05’s voice with higher pitch and tempo.
Believed Country of Origin: USA
Counterpart stations: E05, V05, G05