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

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	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]

	1	2	3	4	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

	1	2	3	4	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

	1	2	3	4	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