So, RFI from similar equipment on both coasts, or some peculiar
communications mode?
Some more info...
The screen shots, and audio recordings the fellow provided came from
SDRs several miles from his house on the east coast, so the noise is
wide-spread at his location. It is also heard centered on 3 different
military HF frequencies, which is why he thought jamming. The
frequencies are: 8992, 11175, and 15016 kHz.
Information on the frequencies, who uses them, and how, to an extent,
can be read here:
https://en.wikipedia.org/wiki/High_Frequency_Global_Communications_System
Kurt
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