priyom.org

REA4

Enigma ID n/a
Name REA4
Frequencies
Status Active
Voice N/A
Emission mode OOK (A1A); 1000 Hz FSK (F1A)
Location Dyagilevo air base, Ryazan Oblast; Belaya air base, Irkutsk Oblast; Khabarovsk, Khabarovsk Krai

Russian (icon)

Activity pages

REA4 is a station of the  Long-Range Aviation Command [ru] of the Russian Air Force. It broadcasts weather reports and "Monolith" messages using Morse code.

Frequencies

European Russia

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daytime 4649, 7314 4292, 5293 4835 4316 4649, 7314
Nighttime 2737, 4179 4379 4357 4379 2737, 4179

Asiatic Russia

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daytime 10981
10653
12337
?
10981
Dawn/Dusk 7785
7515
7402
?
7785
Nighttime 6087
5853
?
6087

Weather reports

Every hour at H+40, REA4 broadcasts a SYNOP report from one of the Long-Range Aviation airfields. These broadcasts consist of a series of 5-digit groups preceded by REA4 REA4 = and followed by = REA4 K. The following is an example message with a translation:

REA4 REA4 = 20100 99900 19150 27627 81997 21702 10014 21015 70300 82031 912// = REA4 K
  • 20100 - 20th of the month at 10:00
  • 99900 - Standard weather broadcast type
  • 19150 - Beginning of the observation period; here: 19th of the month at 15:00
  • 27627 - Airfield identifier
  • 81997 - Manned weather station, weather group included, cloudbase above 2500 m, visibility 10 km
  • 21702 - 2/8ths total cloud cover, 170° wind direction, 2 m/s windspeed
  • 10014 - +1.4°C temperature
  • 21015 - -1.5°C dewpoint
  • 70300 - Clouds developing from previously clear skies
  • 82031 - Mid-level altocumulus translucidous and high-level cirrus fibratus
  • 912// - Observation made during the 12th hour, minutes omitted

The airfield identifiers used are as follows:

It is commonplace for a single weather report to be rebroadcast for hours, with only the first group changing.

"Monolith" messages

REA4 also broadcasts standard "Monolith" messages to at least the following callsigns: 1QRF, 7XMF, HA57, JUE4, JZLB, L9XC, MJUR, MSK7, PABA, QMCK, REA4, RLO92.