Re https://mediumwave.info/2023/09/17/russia-118/
78 kHz is being used for a cable based radio network.
https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D0%B2%
D0%BE%D0%B4%D0%BD%D0%BE%D0%B5_%D0%B2%D0%B5%D
1%89%D0%B0%D0%BD%D0%B8%D0%B5
Maybe they connected that to the SDR.
Marco (2023-09-18)