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G02

Enigma ID G02

Name Swedish Rhapsody
Frequencies
Status Inactive
Voice Female, automated, often mistaken for a child's voice
Emission mode AM, DSB
Location Poland
Activity pages

Download audio sample

Known counterpart stations M04

G02 was first ran by the Polish State Security[1] (SB), then by the Office for State Protection (UOP). Last heard on 9 April 1998.

Triple message format:

Intro Preamble Message #1 Message #2 Message #3
First few bars of "Luxembourg Polka", played from a music box 23087 23087 73322 73322 08958 08958 Achtung 23087 23087 Achtung 61085 61085 09498 09498 ... Ende Achtung 73322 73322 Achtung 54395 54395 90834 90834 ... Ende Achtung 08958 08958 Achtung 83667 83667 69741 69741 ... Ende
  Three 5-figure message headers First header Fixed-length message of 100 5-figure paired groups   Second header Fixed-length message of 100 5-figure paired groups   Third header Fixed-length message of 50 5-figure paired groups  
Repeated for 5 minutes Repeated thrice                  

Single message format:

Intro Preamble Message Outro
First few bars of "Luxembourg Polka", played from a music box Achtung 68003 68003 Achtung 89630 89630 45975 45975 ... Ende
Repeated for 5 minutes 5-figure message header Fixed-length message of 100 5-figure paired groups  

There was a variant to the usual intro, designated "G02a", which was the music box played thrice, followed by "12345 67890 12345 67890", altogether repeated for 5 minutes.

Full transmissions with three messages always took roughly 38 minutes, and those with one message - about 17 minutes. 10 minutes prior to the start, a 1000 Hz test tone, lasting 0.5 seconds, would have been emitted every 3 seconds. The transmissions ran on up to three frequencies in parallel.

While the piece of music is frequently described as "Swedish Rhapsody No. 1" (composed by Hugo Alfvén, completed in 1900s), declassified documents[1] reveal the title of the piece of music actually being used as "Luxembourg Polka" (composed by Emile Reissdorf, completed in 1950s). However, the portions used by G02 are identical in both works.

History

G02 was first reported in early 1960s, but it's possible it had been transmitting even since late 1950s. G02 was noted for very professional operation, with transmissions starting always on time, and with very few mistakes observed.[2]

Prior to 1988, only the 3-message format was being noted. However, in 1988, some of the schedules started sending only one message, and some started including counting during the intro.

G02 had a very complex schedule. The schedules only took place on selected weeks, and the counting of the weeks started on the first Saturday of the month. The fifth week extended into the first week of the next month. One message was repeated across many time slots, up to even 15 times in a single month. The following is G02's schedule that was known in 1996:[2]

Day UTC Freq Mode Messages G02a? Week 1 Week 2 Week 3 Week 4 Week 5
Saturday 09:00 8188 DSB 3   x x   x x
Saturday 11:00 8488 AM 3           x
Saturday 12:00 8488 DSB 3   x     x  
Saturday 20:00 3825 AM ?       x    
Saturday 21:00 4779 AM 1     x      
Saturday 22:00 3825 DSB 1?       x    
Saturday 22:30 3825 DSB 1?       x    
Saturday 23:00 5340 AM 1     x      
                     
Sunday 00:00 4779 AM     x      
Sunday 01:00 5748 DSB     x x    
Sunday 10:00 8188 DSB 3   x x x x  
Sunday 11:00 8188 AM 3         x  
Sunday 12:00 8488 DSB 3   x x x x x
Sunday 20:00 3825 DSB 3   x x x x  
Sunday 21:00 5340 AM 1     x      
Sunday 22:00 4832 DSB 1 x x        
Sunday 22:00 3825 AM 1 x       x  
                     
Monday 13:00 6200 AM 1 x x   x    
Monday 17:00 6200 AM 1 x x   x    
Monday 17:30 6200 AM 1 x x   x    
Monday 22:00 6200 AM 1 x x   x    
Monday 22:30 6200 AM 1 x x   x    
Monday 23:00 6200 AM 1 x x   x    
Monday 23:30 6200 AM 1 x x   x    
                     
Tuesday 18:00 4195 DSB ?     x   x  
Tuesday 21:00 4572 DSB 1   x        
Tuesday 21:00 5340 AM 1 x x x      
Tuesday 21:30 5340 AM 1 x x x      
Tuesday 23:00 3825 DSB 3         x  
                     
Wednesday 13:00 6200 AM 1 x x   x    
Wednesday 17:00 6200 AM 1 x x   x    
Wednesday 17:30 6200 AM 1 x x   x    
Wednesday 20:00 5340 AM 3         x  
Wednesday 21:00 5340 AM 3         x  
Wednesday 22:00 6200 AM 1 x x   x    
Wednesday 22:00 5340 DSB 3         x  
Wednesday 22:30 6200 AM 1 x x   x    
Wednesday 23:00 6200 AM 1 x x   x    
Wednesday 23:30 6200 AM 1 x x   x    
                     
Thursday 18:00 4195 DSB 3     x      
Thursday 20:00 5340 AM 3     x      
Thursday 21:00 5340 AM 3     x      
Thursday 22:00 5340 AM 3     x      
Thursday 23:00 4779 AM 1   x        
Thursday 23:00 3825 DSB ?         x x

On 1 April 1998, the schedules above were fully replaced, leaving only a few transmissions, mostly during European office hours. The schedules listed below were all of the G02a intro format, all were in USB mode, and all contained three messages. The same three messages would have been repeated throughout the entire week. The counting of the weeks still started on the first Saturday of the month. Note that the start times were not rigid, and could start as early as :47. All frequencies kHz.[3]

Monday, Wednesday, Thursday
Week 07:57 09:57 11:57 12:57
1st   6507 8188 5340
2nd See M04
3rd 4832 6200 8188 6507
4th 5340 8188 7250  

However, G02 was finally shut down on 20 April 1998, when E23 took over its schedules.

References

  1. Numbers & Oddities #200 (May 2014) [accessed August 30th, 2014]
  2. ENIGMA Newsletter #10 (January 1996), p. 7-8 - read a scanned version here
  3. Simon Mason, G2/E23 [accessed September 13th, 2014]

Recording courtesy of Numbers & Oddities

Notes from the Conet Project booklet

G2: 'The Swedish Rhapsody' Repeated tone for ten minutes * I.S. (first few bars of "Swedish Rhapsody" played on a
musical box -R5) 66252 66252 11850 11850 93888 93888 (R x3) ACHTUNG! 66252 66252 ACHTUNG! (100 x 5F pairs)
= 76766 13000 78361 .... (2nd message block follows in same way - always 100 paired groups, after which 3rd msg
block follows, but this time always 50 pairs. Ends: 'ENDE')