RDL is one of the callsigns used on a Russian Armed Forces one-way strategic network widely heard on VLF and HF radio.

The network carries FSK Morse and BFSK data, with a shift of either 200Hz on HF, or 75Hz on VLF. It airs several kinds of broadcasts, all using FSK-modulated Russian Morse code unless noted otherwise:

  1. Messages consisting of two 5-digit groups repeated three times, e.g. RDL RDL RDL 36855 52267 36855 52267 36855 52267 K
  2. Longer 5-digit group messages, e.g. RDL RDL RDL 11111 97842 64537 ... 59306 18418 23077 K (in the last group, the first 2 digits are the day of the month, and the last 3 digits are the number of groups; the first group may also be 22222)
  3. "Monolith" type messages, typically using the circular callsign WEGI, but sometimes also others, e.g. XXX XXX WEGI WEGI 80637 KABELXQIK 6622 9778 K
  4. Digital 50Bd T-600 messages, sometimes preceded by hand-keyed FSK Morse "XXX XXX" ("Monolith" type message indicator)

The network is organized into two frequency clusters. One uses 18.1kHz as the VLF channel, while the other uses 21.1kHz. The HF simulcast list is not exhaustive.

18.1 10535, 11468, 12832, 14411, 14664, 16112, 17460, 19210, 22864
21.1 8130, 10164
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