|Known counterpart stations|
M39 was run by the Czech military intelligence. It used the same frequencies as M10. However, it didn't transmit conventional 5-figure group messages.
The transmission format is given below. Standard five dashes were used for zero.
|3-figure ID||5-figure group|
|Repeated for 2 minutes||Repeated for 15 seconds|
|Repeated with different 5-figure group|
M39 had no specific outro, it simply ended following the last series of dashes.
[Based on ENIGMA 2000 Morse Profiles List]