|Enigma ID||X06, X06a, X06b, X06c||
|Emission mode||USB + carrier, USB, AM|
|Known counterpart stations|
Mazielka is a calling system used by the Russian Ministry of Foreign Affairs.
Usually transmitted in USB mode with a carrier, it consists of a roughly 2-second string of 6 tones in succession, 333 ms per tone, followed by a 1380 ms pause, repeated over and over. The tones have the following approximate frequencies, in hertz:
In normal operation, strings of only unique digits are used, allowing 720 different combinations, although far fewer than that are actually allocated. Each sequence corresponds to a single Russian diplomatic mission (in most cases an embassy), and has its own set of multiple HF frequencies assigned to it.
Normal Mazielka activity is always associated with two-way contacts. In most cases, it indicates that such a contact has just taken place and is about to resume briefly elsewhere. The two-way modes associated with Mazielka are "Perelivt" and Serdolik.
The vast majority of Mazielka activity is associated with regularly scheduled contacts that take place twice monthly during weekday daytime. Mazielka calls are occasionally made at nighttime, although this is very uncommon, and typically associated with special world events.
When not in normal operation, Mazielka can be heard using various non-unique digit strings, such as 123456, 111666, 121212, and 111111. In one particular case, the sequence 111666 can be heard about an hour before European E07, M12, XPA, and XPA2 schedules, on the frequencies these schedules are going to use, in ascending order (regardless of the order used on the schedule). It is unknown to what degree Mazielka is related to the Russian 7 operator.