Analysis of signal on 16084 khz.

16084-6khz. A mult-tone system consisting of 12-14 tones. The aggregate baud rate is 100. Also, if two tones are isolated the baud rate is 100 and the auto-correlation analysis shows a spike at 24 bits. The sound of the modem could be described as "buzzing." I don't have the foggiest notion on this one. I don't think it's a form of FDM.
The oscilloscope image looks very similar to one produced by a standard HF fax signal. The signal does scan across the entire bandwidth. If you run a fax screen at 240/176, you get an interesting and odd image.

Update
Mike Chace has suggested that this might be a jammer and that a numbers station might be its target.
This theory is bolstered by my finding another one on 15685, centered over an AM shortwave broadcast station.

Here's a 113k wav file of the signal, mono 8 bit.
Here's a 256k file of the signal, in Code30 RTS format.

Spectrum analysis with waterfall display

16084b.gif (7666 bytes)
Oscilloscope Display. This explains the buzzing sound .

Weird fax screen?