E11 / E11a is a very active numbers station operated by Polish AW which has existed since the early 80’s. It was nicknamed Oblique since the station uses “Oblique” for a dash “/” in its format. E11 is the ID given when there is a null transmission. E11a is the ID given when the station sends a message.
E11a Message Sample
During a random time of the month this station sends at least one message, and E11a is used as the identifier for messages. Although E11 is the designation for a null message, a scheduled E11 can send a message instead of a null sometimes.
E11a usually sends messages around 20 to 40 groups long. Most of the time, the station sends null transmissions though. E11 has a lot of IDs that are never used when sending actual messages.
E11/E11a is sent through a computer operating on windows XP and sounds from the OS can occasionally be heard during broadcasts.
Schedule
E11 transmits null messages daily year-round. Frequencies commonly change depending on the month. They switch during the periods of November to February, May to August, and the other months have their own schedule as well. The first two digit ID is used to identify which schedule is active.
Variants
There are 2 variants to this number station, the first being E11b which appeared in 2003 and then E11c in 2010.
E11b
E11b is an E11 variant first reported in 2003 and ceasing in 2009. This type of transmission always sent 30+ groups beginning and ending with a 77777 stutter group, pausing every 10 groups. Emitted in USB like all transmissions and could possibly return in the future.
E11c
E11c is a variant of E11 first reported in 2010 and last logged in 2013. It could possibly return. This was a counterpart to the Morse STRICH station.
Message Format
| Preamble | Message | Repeat | Outro | ||||
| 824 | Oblique | 33 | Attention | 53434 53434 60249 60249 … |
Attention | 53434 60249 … | Out |
| 3-digit ID (###) |
“/” | Group count | 5-digit paired groups, pauses every 10 pairs |
5-digit single groups, pauses every 10 groups |
|||
| Repeats for about 3 minutes | |||||||
Null Format
| 942 | Oblique | 00 | Out |
| 3-digit ID (###) | “/” | ||
| Repeats for about 3 minutes | |||
Numbers Station Summary
Nickname: Oblique
Activity: Active
Emission Mode: USB
Voice Summary: Automated female voice with Eastern European accent. Odd pronunciations of the numbers.
Location: Poland
Family Relatives: G11, S11, S11a, M3, G10, S26, M20
Station Family: Family 3 “Strich”
Sources
Simon Mason’s E11 Page (Archived)
