Unid (probably Russian) MFSK-17/125 125Bd burst transmission heard on 21292 kHz USB (15mt HAM band) USB at 0830 UTC.
Fig. 1 |
Fig. 2 |
The same waveform was already noted six years ago(!) and reported in this blog:
http://i56578-swl.blogspot.com/2017/07/russian-mfsk-17-125bd125hz-burst-system.html