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E03

Enigma ID E03

Name Lincolnshire Poacher
Frequencies 5422, 5746, 6485, 6900, 6959, 7337, 7755, 8464, 9251, 10426, 11545, 12603, 13375, 14487, 15682, 16084, 16475
Status Inactive
Voice Female, automated, with British accent, the last digit in the groups was inflected
Emission mode USB
Location Akrotiri, Cyprus
Activity pages

Known counterpart stations E03a

Last heard on July 2, 2008.[1]

Format:

Preamble Message Outro
First two bars of "The Lincolnshire Poacher", rendered electronically 87383 6 chimes 69410 69410 03932 03932 42175 42175 ... 46367 46367 6 chimes First two bars of "The Lincolnshire Poacher", rendered electronically
  5-figure message header   Fixed-length message of 200 5-figure paired groups    
Repeated 12 times Repeated 10 times       Repeated 6 times
Repeated for 10 minutes

No null message format existed, each broadcast carried a message. Full transmissions always took 45 minutes, and always took place on three frequencies in parallel. The transmissions were made daily, 12 hours a day, on the following times and frequencies:[2] (UTC and kHz)

Monday Tuesday Wednesday Thursday Friday
12:00 14487 15682 16084 12:00 14487 15682 16084 12:00 14487 15682 16084 12:00 14487 15682 16084 12:00 14487 15682 16084
13:00 14487 15682 16084 13:00 14487 15682 16084 13:00 14487 15682 16084 13:00 14487 15682 16084 13:00 14487 15682 16084
14:00 10426 12603 14487 14:00 16314 14487 12603 14:00 14487 15682 16084 14:00 14487 15682 16084 14:00 14487 15682 16084
15:00 11545 13375 15682 15:00 7755 8464 10426 15:00 11545 14487 16084 15:00 11545 12603 13375 15:00 11545 12603 13375
16:00 11545 12603 13375 16:00 11545 13375 15682 16:00 6485 7755 10425 16:00 8464 12603 14487 16:00 11545 12603 13375
17:00 6959 8486 11545 17:00 11545 12603 13375 17:00 12603 14487 16475 17:00 5422 6465 8464 17:00 11545 13375 16084
18:00 7337 9251 12603 18:00 5746 6959 9251 18:00 6959 9251 11545 18:00 12603 14487 16475 18:00 5422 6485 8464
19:00 7337 9251 12603 19:00 6959 9251 11545 19:00 5746 6485 8464 19:00 6959 9251 11545 19:00 11545 13375 16084
20:00 6959 9251 11545 20:00 7337 9251 12603 20:00 6959 9251 11545 20:00 6959 9251 11545 20:00 6959 9251 11545
21:00 6959 9251 11545 21:00 7337 9251 12603 21:00 7337 9251 12603 21:00 5746 6959 9251 21:00 6959 9251 11545
22:00 6959 10426 11545 22:00 6959 9251 12603 22:00 7337 9251 12603 22:00 7337 9251 12603 22:00 5746 6959 9251
Saturday Sunday
12:00 14487 15682 16084 12:00 14487 15682 16084
13:00 14487 15682 16084 13:00 14487 15682 16084
14:00 10426 11545 14487 14:00 11545 14487 16084
15:00 11545 12603 13375 15:00 11545 12603 13375
16:00 11545 12603 13375 16:00 8464 10426 11545
17:00 11545 12603 13375 17:00 11545 12603 13375
18:00 11545 13375 8464 18:00 7337 9251 12603
19:00 5422 6485 8464 19:00 6959 9251 11545
20:00 6900 10462 11545 20:00 6959 9251 11545
21:00 6959 9251 11545 21:00 5746 6959 9251
22:00 5746 6959 9251 22:00 5422 6485 8464

Despite a large amount of schedules, there actually only were 18 messages a month, sent throughout each week in a specific pattern. There were two sets of messages each month, the former for the first 14 days of the month, and the latter for the remainder. Assuming the messages are assigned letters A to I, the pattern was the following:

UTC Mon Tue Wed Thu Fri Sat Sun UTC
12:00 A A A A A A A 12:00
13:00 B B B B B B B 13:00
14:00 C D E F A G H 14:00
15:00 H C D E F A I 15:00
16:00 I H C D E F G 16:00
17:00 G I H C D E A 17:00
18:00 A G I H C D E 18:00
19:00 E B G B H C B 19:00
20:00 B A B I B H E 20:00
21:00 E F A G I B D 21:00
22:00 D E F A G I C 22:00

E03 started in the current format in 1988. However, its origins can be traced back to the 1970s, when it was transmitting in AM mode, with male voice, and non-electronic rendition of the intro tune. The transmitter site at the time was Her Majesty's Government Communications Centre, in Gawcott near Buckinghamshire.[2]

E03's operation habits have never changed. It had very few mistakes during its lifetime. E03 was frequently a target of Iranian jammers.

There initially were twelve transmissions a day, hourly from 10:00 to 22:00 UTC. However, the 10:00 and 11:00 transmissions were discontinued in 1998.[3] These used the same frequencies as 12:00 and 13:00 transmissions.

Radio direction finding efforts in 2000, conducted by radio enthusiasts from Cyprus traced the source of the signal to the 12th Signals Unit of the Royal Air Force base near Akrotiri. Pictures of the site can be found here.

References

  1. Numbers & Oddities #130 (June 2008) [accessed August 28th, 2014]
  2. Simon Mason's website [accessed August 28th, 2014]
  3. ENIGMA Newsletter #16 (January 1999), p. 70 - read a scanned version here
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