6728 USB vs 6731.5 LSB vs. 6731.6 AM Messy 0600 UTC 13 April 2017

[R4002]

Two QSOs going on at once and causing terrible QRM, both appear to be in Portuguese but its hard to tell for sure. One on 6728 USB is slightly stronger. Another QSO going on at the same time on 6731.5 LSB, and further complicating matters is a carrier sitting on 6731.57 kHz (rounding up to 6731.6 kHz).  The carrier has very weak modulation, with progressively weaker tones showing up on the waterfall at 200 Hz intervals.  That is, a strong carrier with 5 weaker "carriers" on either side of it.  Going up from center, 6731.8 kHz, 6732.0 kHz, 6732.2 kHz, etc.  Going down from center, 6731.4 kHz, 6731.2 kHz, 6731.0 kHz, etc.  The lower side band of this odd AM signal is making listening to this already very messy frequency that much more, well, messy.