I shouldn't have let the camera run so long, but here's what it looks like in MultiPSK when you're decoding a HF Fax signal. That "chug chug" sound is pretty indicative that's what it is, SSTV sounds sort of similar but not exactly.
KF5OLV - 20120919 0247UTC - HF Fax from NOAA, Hurricane center type of stuff.
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