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E06 is ran by the Russian Main Intelligence Directorate
Null format: (rarely heard)
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 has two rare variants: E06a, referring to
2-group messages commencing with "11111", and E06b, referring to
additional 5-figure group in the preamble.
E06 is mostly heard unscheduled, but there are a few regular
transmissions. The formats of the schedules are highly varied:
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. One schedule exists -
2nd Wednesday 19:20/20:20 UTC + following Sunday 11:20/12:20 UTC -
where the test is performed an hour before the transmission with
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
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
February 2001, but dates back to at least 1992, and was previously
used by E07.
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
voice 2: 821 (R5) * 704 704 42 42 = (42 pairs) 60083 53821 53933
.....23301 62657 31341 30833 14423 94069
88315 7630530346 63164 22476 13677 41846 36111 .... 10496 * 704
704 42 42 00000
voice 1: 341 (R5) * 269 269 37 37 = (37 pairs) 19881..... ending
as E6 voice 2
voice 3: pairs .....95978 03685 20719 16727.... format as E6 voice
null message format (voice 2): 897 897 897 00000 (R5)
Russian Intelligence. R 12/03/92
Tcp d2 17 english man irdial by The Conet
Russian Intelligence. Different voice. R 12/08/93
Tcp d2 23 english man irdial by The Conet
English Man Version 1
See Enigma signal list.
Tcp d3 05 english man version 1 irdial by The Conet
English Man Version 3
Note the 'zeeero'.
Tcp d3 06 english man version 3 irdial by The Conet
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