7600 Hz wideband signals from (only!) Kiwi ArcticSDR and using single tone QAM-64 modulation at a symbol rate of 7200Bd. The signals seem to have specular positions of a "supposed" reference/pilot tone. Most likely, the signals "leak" out of wired high-voltage lines (PLC) running close the Bjarne's KiwiSDR.
https://yadi.sk/d/P_r6r69SqVf_3g