|Voice||Male, automated, with Russian accent|
|Emission mode||USB + carrier|
|Known counterpart stations||E17, G06, S06, V06, V23, M14, M24|
E06 is run by the Russian Main Intelligence Directorate (GRU).
Null format: (rarely heard)
|3-figure transmission ID|
|Repeated for 4 minutes|
|460||597||123||33038 33038 71495 71495 71036 71036 ... 08047 08047||597||123||00000|
|3-figure transmission ID||3-figure group, purpose unknown||Amount of 5-figure groups in the message||5-figure paired groups||3-figure group, purpose unknown||Amount of 5-figure groups in the message|
|Repeated for 4 minutes||Repeated twice||Repeated twice||Repeated twice||Repeated twice|
If more than one message is to be transmitted, then instead of "00000", the transmission ID is spoken again for one minute, then the standard message procedure follows for the next message.
E06 is mostly heard unscheduled, but there are a few regular transmissions. The formats of the schedules are highly varied:
- Different frequency every month, different ID every month, adjusts to summer time, repeats an hour later on a different frequency, and also 24 hours later at the same times and on the same frequencies, same message repeated entire month
- Different frequency every month, same ID every month, adjusts to summer time, repeats an hour later on a different frequency, and also 24 hours later at the same times and on the same frequencies, each week means a different message
- Seasonal frequency changes, same ID every month but changes yearly, does not adjust to summer time, repeats an hour later, then repeats a few days later at different times and on different frequencies
- No frequency changes, same ID every month, repeats a few hours later on a different frequency, does not repeat on a different day, each week means a different message
Most of the transmissions are preceded 5 to 20 minutes prior to the start by a long test tone, followed by the E06 voice giving the ID of the upcoming transmission once. Afterwards the carrier is either switched off, or kept silent up until the broadcast begins. The transmissions can occur at any 5-minute interval within an hour, but full and half hours are preferred.
The entire transmission process is handled using a computer running Windows 7, as evidenced by leaked sound effects. Prior to April 2014, Windows XP was used instead.
The E06 message groups themselves don't exhibit any non-randomness, except in training messages. The second 3-figure group in the header never uses digits from the transmission ID, except in invalid messages.
Two schedules, on first and third Thursday at 20:30 UTC, and the Fridays following the first and third Thursday at 21:30 UTC, are handled differently to the normal transmissions. The messages are non-random, the message length is fixed at 20 groups, and the messages are repeated for many months. While the transmissions use the same software as the regular transmissions for producing the numbers, the transmissions are started up manually, frequently late. All of these behaviors together suggest a training nature of these broadcasts.
Up until November 2013, the training messages were 15 groups long. This change was also made on the training schedules of E06's sister stations.
Up until April 2014, even the numbers being spoken were produced manually, presumably by an operator at a keyboard, as indicated by highly inconsistent tempo. The zeroes ending the transmissions were always noticeably spaced.
It is unknown when E06 was first noted, but it was going strong by the 1970s. Its operation habits, besides equipment upgrades, have not changed since then.
Many different voices have been used throughout E06's existence, sometimes only lasting a few days. The current one is in use since January 2001, but was used by E06 way before then, and was previously used by E07. The last time E06 used a different voice than the current one was in September 2003.
While initially reported using the full AM mode with two sidebands (A3E), E06 changed to the current USB + carrier mode (H3E) some time in late 1990s. On 11 June 2014 and 18/19 September 2014, E06 was noted sending in pure USB mode without carrier (J3E).