Some kind of propagation sounder maybe?
I rather doubt a sounder of some kind. In general there needs to be some kind of modulation on a sounder or a swept rate that is known. A dead carrier jumping in 3 kHz steps would not be able to be distinguished from CW (honest CW here, not talking code) noise on the frequency, so there would be too much likelihood of false data.
I see you have the Chinese OTHR at the lower half of the waterfall, a sounder on about 6971 or so, but what is that on 6980? It looks too narrow to be a Chinese 4+4 modem.
T!