I have some interference in the neighborhood, and it's every +/- 80 kHz starting at 1684 kHz. It's 20-30 khz wide and every other blip is really strong. The third signal falls on 1844 kHz, which is an FT8 frequency on 160 meters. The interference disappears around 7000 kHz. Since I've been watching it, it hasn't shut off.
The K9AY loops and the MFJ-1026 can't really reduce it much when I'm pointed right at it. It's very strong when the loop is favoring southwest, so the 1026 really struggles with it. I can null it out when I point northeast.
I walked around the neighborhood with a portable (antenna retracted and atten on), and it appears to be coming from a residence about a 150 yards away, but I'm not walking to the door without backup. Ha...