G12 and the other NNN format number stations are a network determined to have been run by the Austrian Army Intelligence Office (HNA). This station was first spotted on April 23rd, 1984 on 4031 kHz at 03:00 UTC. There were a few different automated voices it used, and one of them was able to determine that the station was run by the HNA.
One of the alternate voices distinctly sounded like Austrian German. Before Peter H from Germany and Pango in Australia wrote to Simon Mason, the voice was possibly thought to be Yiddish.
Message Recording
Schedule
These are the known times and frequencies of G12 in the early 1990’s and on.
| UTC | Frequency |
| 05:00 | 4021 kHz |
| 18:00 | 5880 kHz |
| 20:00 | 4054, 4545, 5425, 6765 kHz |
| 21:00 | 4021, 4054, 4545, 4925, 5177 kHz |
| 22:00 | 4021, 4545 kHz |
Message Format
| Preamble | Message | Outro | |
| “N” | Gruppen 54 | 57709 57709 71462 71462 … |
Ende |
| Sent in Morse code | Group count | 5-Figure paired groups | |
| Repeated for 5 minutes | Repeated 2x | ||
Numbers Station Summary
Nickname: NNN
Activity: Inactive
Emission mode: AM, All NNN Stations emited in AM
Voice Summary: Automated woman’s voice. Very monotone and read the numbers very slowly.
Believed Country of Origin: Possibly Austria
Counterpart Stations: E12, V12, V18, M02
Station Family: (Possibly) Family 4 “NNN”
Sources
The Conet Project G12 Recording
Simon Mason’s Website NNN Sign On Page
ENIGMA Newsletter Issue #1 (1993), Page 3
