priyom.org

Pacific Weekdays Network

Status: inactive

This network consists of a group of transmissions over the Pacific area taking place on every weekday, each transmission spaced one hour apart, involving several stations of the Russian 6 operator, representing all of its digital, voice and Morse modes. They follow this schedule:

Week Day UTC Station Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Group count
Every Monday
Tuesday
Wednesday
Thursday
Friday
00:00 F01
Weekdays
17471 245
01:00 14421
02:00 F06 ID
60146
16321
03:00 14881
04:00 S06 ID 480 15721 50, 55 or 60
05:00 M14 ID 952 18041

Each station sends one, different, new message every day (F01 and F06 repeat their respective messages one hour after in the second transmission). They always use the same group counts: 245 for digital modes F01 and F06, and either 50, 55 or 60 for analog modes S06 and M14.

This network is believed to be transmitted from a site in the Russian Far East. The transmissions span over several hours during the daytime over the Pacific area, on frequencies that are compatible with propagation over it. The same set of frequencies is always used, all year round. This network transmits through the daytime from Monday to Friday, but doesn't transmit during at least these Russian holidays, and associated bridge holidays:

  • All days from January 1 to January 8 inclusive
  • February 23 (Defender of the Fatherland Day)
  • March 8 (Women's Day)
  • May 1 (Labor Day)
  • May 9 (Victory Day)
  • June 12 (Russia Day)
  • November 4 (Unity Day)

Moreover, this network doesn't follow some operational habits of this family, such as next-day message retransmission scheduling, or occasional slight frequency changes to avoid interfering signals (in particular for S06 ID 480, transmitting in the 19m broadcast band); as well, F06 ID 60146 diverges from normal F06 metadata behaviors, and its headers suggest atypical message encryption. Combined with the amount and spread of the traffic, these specificities could point to an unknown particular purpose for this network, with possibilities ranging from some kind of utility broadcast network, to dummy operations.

Starting on March 12, 2019, it was noticed that messages with slightly different group counts than normal were being sent on this network. Then two weeks later, all transmissions on this network stopped. The last transmissions were observed on March 26, 2019.

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