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G14

Enigma ID G14

Name DFC37/DFD21
Frequencies 3370 (DFC37), 4010 (DFD21)
Status Inactive
Voice Female, automated, the last digit in the groups was inflected (the same as G15 and G16)
Emission mode AM, USB
Location West Germany
Activity pages

Known counterpart stations

G14 was operated by (West) German Federal Intelligence Service (BND), ceased in early 1990s, operated since late 1950s. The callsigns DFC37 and DFD21, and their frequencies of 3370 and 4010 kHz were both ITU-allocated, making them one of very few legitimately operating number stations.

The designator G14 refers to the post-1988 format of the transmissions, which involved an automated voice; refer to the G14a for the old variant.

Preamble Message
"Delta Foxtrot Delta Zwo Eins" or "Delta Foxtrot Charlie Drei Sieben" Random electronic melody Es folgen Mitteilungen für 278 278 24 gruppen Achtung 278 278 24 gruppen 624-78 624-78 038-18 038-18 ... Ende
Repeated twice
  "Messages are following for" 3-figure recipient ID Amount of 5-figure groups in the message   3-figure recipient ID Amount of 5-figure groups in the message 5-figure paired groups, with a break after the third digit.  
Repeated for 5 minutes   Repeated as necessary with different data for multiple messages For each message

DFC37 and DFD21 were transmitted every day from 15:00 until 22:00 UTC. The messages were first transmitted at the top of the hour in AM mode, and then repeated at half hour in USB mode. DFC37 and DFD21 used their own recipient ID's, not shared with any other BND station.

The voice used standard German military radio pronuncation of "2", "5" and "9", being rendered as "zwo", "fünnef" and "neuen", respectively.

The following were the recipient ID's used by DFC37 and DFD21. They were shared by both the stations.

  1 2 3 4 5 6 7 8 9
2 107 204 316 400   619 735 811 904
12 114 211 323 411   623 784 817 914
20 116 225 330 413   641 792 821 925
36 117 229 336 414   644   823 934
44 121 236 354 423   651   827 991
47 129 237 356 426   680   832  
62 130 251 387 428       840  
65 134 259 397 431       846  
69 147 261   435       851  
74 154 273   450       852  
79 157 278   471       867  
83   291   483       872  
85   295   490       880  
94               890  
95                  

Details on encryption and decryption of the messages can be found in this declassified Polish counter-intelligence document.

[ID's were taken from Simon Mason's 1991 book Secret Signals]

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