|Voice||Male and female, live|
|Known counterpart stations|
"The T Marker" is a Russian military commandment network. It broadcasts on 4182 kHz around the clock. It is mostly noticeable by its channel marker sending intermittent tone dashes, like the Morse code character "T".
Over the years, only very rare messages and test counts have been heard on it. The messages were of the "Monolith" format and used the callsign Osnova-48 (Russian: Основа-48).
|April 5th, 2018||15:57||
||Osnova-48 /Основа-48||17289||ILLYuSTRATOR 8708 7328||ИЛЛЮСТРАТОР 8708 7328|
The channel marker was first heard on 4524 kHz in July 2015. It disappeared later that year, only to return on the same frequency nearly two years later, on April 11, 2017. On April 4, 2018, it moved to 4182 kHz. Since then, on several instances, it temporarily moved to different frequencies, for a few days before returning to 4182 kHz.
- From July 26 to 30, 2018, it transmitted on 4593 kHz.
- From August 30 to September 12, 2018, it transmitted on 4593 kHz again.
- From October 27 to 29, 2018, it transmitted on 4223 kHz.
- From December 1 to 4, 2018, it transmitted on 4352 kHz.
- From December 19 to 21, 2018, it transmitted on 4280 kHz.
- From January 25 to 29, 2019, it transmitted on 4182.5 kHz.
In early January 2019, the marker signal was traced using multilateration to the Tver area. However, on January 18 that month, an operator chatter was leaked, which mentioned Naro-Fominsk as the transmitter location, also known to be used by the sister station The Buzzer. Since then, multilateration attempts on the marker signal have led to the Moscow area.