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Frequencies 18.1 kHz
Frequency Range 18.1 kHz - 18.1 kHz
Mode CW
Modulation FSK,CW-FSK
Emission Designator
Location Russia
Short Description RDL is a Russian VLF station located in Krasnodar. It is one of the few VLF stations that changes modes during routine transmissions.
I/Q Raw Recording
Audio Sample

RDL is one of the most interesting VLFVery Low Frequency (3-30 kHz) stations due to its variety of modes and intermittent, but frequent operation.

The station has two modes of operation:

  • Fast FSKFrequency-Shift Keying, used most of the time
  • Slow Morse FSKFrequency-Shift Keying, cleartext. Usually broadcasts the callsign, followed by some numbers, and finishing with the time of the transmission.

The transmissions will cease, or switch to a very low power when the message is sent. The duration of the transmission is very variable, from less than a minute to more than ten.

Decoding Software[edit]

When in CWContinuous Wave-FSKFrequency-Shift Keying mode:

Additional Links[edit]